content string | quality_label int64 | meta string | all-MiniLM-L6-v2_embedding list | doc_id int64 | unique_id string |
|---|---|---|---|---|---|
Completion of local rings in the exceptional divisor of a blow-up
up vote 5 down vote favorite
Let $X=\mathrm{Spec}(A)$ be an affine variety, $Z\subseteq X$ a closed, reduced subscheme. Let
$$\beta:Y=\mathrm{Bl}_Z(X)\to X$$
be the blow-up of $X$ in $Z$. In other words, $Y=\mathrm{Proj}(A[IT])$ for $I:=I(Z)$. Let $E:... | 4 | [
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0.09228515625,
0.006011962890625,
-0.0270996093... | 7,600 | 7600 | |
X and Y Intercepts
Graphing X and Y Intercepts
Graphing x and y intercepts, x-intercepts are where y=0 and y-intercepts are where x=0 . Here some following x y intercepts example,
(a) Both the intercepts OA, OB are positive;
x-intercept is A where B=0 and y-intercept is B where A=0.
Both x and y intercepts are p... | 4 | [
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0.037841796875,
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0.10009765625,
-0.06640625,
-0.0... | 7,601 | 7601 | |
Ice Cream Cone Problem
Date: 02/27/2000 at 19:57:39
From: Tripp Ratcliff
Subject: Maximum volume
I'm not sure if you've heard of the ice cream cone problem, but it
goes like this: You are to place a sphere of ice cream into a cone of
height 1. What radius of the sphere will give the most volume of ice
cream inside t... | 5 | [
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0.00543212890625,
-... | 7,602 | 7602 | |
proving in cosets
March 15th 2011, 11:15 PM
deniselim17
proving in cosets
I have 2 questions on cosets.
Let $G$ be a group with subgroup $\langle h \rangle$.
Let $g \in G \backslash \langle h \rangle$.
If there exists $N \lhd G$ such that $[a,h] otin N$, show that $g otin \langle h \rangle N$.
... | 5 | [
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simplification through substitution
September 25th 2010, 03:08 PM #1
Newbie
Joined
Sep 2010
Posts
2
simplification through substitution
Hey guys,
I'm working on a physics lab that is trying to derive a specific equation by using other equations but I'm having problems...
Heres the question:
D... | 4 | [
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C^\infty versus semiclassical wavefront sets
up vote 3 down vote favorite
1
Zworski states that if $u$ is a compactly supported distribution, independent of the semiclassical parameter $h$, then the relationship between the $C^\infty$ and semiclassical wavefront sets of $u$
is given by:
$WF_h(u)=(\mathrm{supp}(u)\tim... | 5 | [
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0.0032196044921875,... | 7,605 | 7605 | |
dilute concentration
May 16th 2008, 03:20 AM
starcherub08
dilute concentration
Hello, I have a question regarding dilution:
If i need to dilute 50% dextrose into 20mg of a 2.5% solution, how would i do that?
May 16th 2008, 04:07 AM
abender
If i need to dilute 50% dextrose into 20mg of a 2.5% solution... | 4 | [
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0... | 7,606 | 7606 | |
Joint Density problem....
May 8th 2009, 06:12 PM #1
Senior Member
Joined
Jan 2009
Posts
296
Joint Density problem....
Question 5.
The joint density of two random variables X and Y is given by
f (x, y) = (x^2)y
whenever 0 < x < 1 and 0 < y < 4, and f (x, y) = 0 otherwise.
Are X and Y inde... | 4 | [
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true/false help
November 16th 2007, 07:41 AM
ratedmichael
true/false help
please help: (int = integral)
True (T) or False (F)? Let Int(a,b)(f dx) be the integral from a to b of f with respect to x
_____ Int(1,2)(Int(1,2)((xy dx dy)) = Int(1,2)(Int(1,2)(xy dy dx))
_____ Int(1,2)(Int(1,3)(xy^2) dx d... | 5 | [
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0... | 7,608 | 7608 | |
W = mgh
In
equations
, the formula:
$W = mgh \,$
is called the “gravitational work”, or
potential energy
, and is the
work
done by a
force
on a
body
of mass
m
, against the force of
gravity
g, when the mass is raised though a distance of height
h
or, conversely, the work done by the force of grav... | 4 | [
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... | 7,609 | 7609 | |
Decomposing the plane into intervals
up vote 10 down vote favorite
1
I posted this on Stack Exchange and got a lot of interest, but no answer.
A recent Missouri State problem stated that it is easy to decompose the plane into half-open intervals and asked us to do so with intervals pointing in every direction. That g... | 5 | [
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Complexity of surfaces bounding knots in 4-ball and 3-sphere respectively
up vote 9 down vote favorite
2
I'm interested in a complexity question related to problems like the slice-ribbon problem.
To be specific, if $K \subset S^3$ is a knot, it might be non-trivial yet still bound a smoothly-embedded compact 2-dimens... | 5 | [
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Solving for One Uknown among Many: How and Why
Date: 09/20/2010 at 05:19:44
From: Emma
Subject: Solving for the Unknown with Unknowns Instead of Numbers
I have no problem solving for unknowns in equations that look like this:
5(6 + x) = 9 + 1x
But my math book gave me problems to solve for x that look like this:... | 4 | [
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0.07373046875,
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How many mph to travel 2 miles in 13 minutes?
December 24th 2012, 11:19 PM
Jerick
How many mph to travel 2 miles in 13 minutes?
How many miles per hour would you need to be going to go 2 miles in 13 minutes, and how would you calculate that?
December 25th 2012, 12:27 AM
ibdutt
Re: How many mph to travel 2 mil... | 4 | [
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... | 7,613 | 7613 | |
homogenuity of $\ell^p$
up vote 3 down vote favorite
1
I want to know the following:
If $x_1, x_2, \cdots, x_n, y_1,y_2, \cdots, y_n \in \ell_p$ satisfies $\|x_i-x_j\|_p=\|y_i-y_j\|_p$ for any $i,j$, then does there exist isometry $F$ of $\ell_p$ which send each $x_i$ to $y_i$ ?
Also do you know the precise descript... | 5 | [
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Cambridge Question - The Prosecutor's Fallacy.
October 1st 2013, 08:14 AM
zikcau25
Cambridge Question - The Prosecutor's Fallacy.
************************************************** ************************************************** ****************************
EXERCISE 4B Question 13 - Statistics 1 (Steve Do... | 5 | [
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Unit Circle: Trig Functions of Real Numbers
December 1st 2009, 03:18 PM #1
Newbie
Joined
Dec 2009
Posts
3
Unit Circle: Trig Functions of Real Numbers
The question asks to find the sine of 5pi/7. My teacher says to add/subtract an n value of pi to get a value on the unit circle; and then I find the sine. ... | 4 | [
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More Axiom of Union and Powerset
Last edited by abc512; August 29th 2009 at 11:19 AM. Reason: clarity.
Let $y \in x$ and let $z \in y$. Then $z \in \cup x$ (definition of union). So $y \subseteq \cup x$. It follows that $y \in \mathcal{P} \left(\cup x \right)$ (definition of power set). We showed that
$y \in x$ implie... | 5 | [
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0.09033203125,
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0.07421875,
0.00799560546875... | 7,617 | 7617 | |
Mean Proportionals and Geometric Means
Date: 01/06/99 at 19:49:02
From: Mary
Subject: Mean proportional
How do you find the mean proportional of two numbers? I've never known
how to do this.
Date: 01/06/99 at 20:13:11
From: Doctor Pat
Subject: Re: Mean proportional
Mary,
The mean proportional is also called the ... | 4 | [
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Intersection of Hilbert class fields of imaginary quadratic fields
up vote 4 down vote favorite
2
In this question Hilbert class field of Quadratic fields it is mentioned that if $d\equiv 1 \mod 4$ then the Hilbert class field of $\mathbb{Q}(\sqrt{-d})$ contains $\mathbb{Q}(i,\sqrt{d})$.
Could someone point me to whe... | 4 | [
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Higgs at 125 GeV and SUSY with heavy scalars
See also: Gordon Kane about his/their stringy Higgs prediction
The world is eagerly expecting whether or not CERN will announce some evidence from the diphoton channel that there is a Higgs boson whose mass is between 124 and 126 GeV.
Well, the bump will probably be a ... | 4 | [
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Nondegenerate inner product proof
November 8th 2011, 01:44 PM
uberbandgeek6
Nondegenerate inner product proof
Take n-tuples from the field of 4 elements. Define a Hermitian inner product (u,v)H by setting (u,v)H equal to the sum of all u * v^2 in the same place (its basically the same as a regular inner
prod... | 5 | [
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-0.03955078125,
-0.004913330078... | 7,621 | 7621 | |
How to calculate pressure drop and friction losses in a pipe
Laminar Flow and Turbulent Flow of Fluids
Resistance to flow in a pipeWhen a fluid flows through a pipe the internal roughness (e) of the pipe wall can
create local eddy currents within the fluid adding a resistanc... | 5 | [
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0.0849... | 7,622 | 7622 | |
Math Forum - Ask Dr. Math Archives: Remainder/Divisibility Puzzles
Remainder/Divisibility Puzzles, a selection of answers from the Dr. Math archives.
Find the smallest whole number that when divided by 5, 7, 9, and 11 gives remainders of 1, 2, 3, and 4 respectively.
What number less than 500 produces remainde... | 4 | [
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0.0292968... | 7,623 | 7623 | |
Automorphisms of Riemann surface and mapping class
MathOverflow is a question and answer site for professional mathematicians. It's 100% free, no registration required.
For a higher genus Riemann surface $\Sigma$, is it true that every nontrivial (holomorphic) automorphism is of nontrivial... | 5 | [
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0.... | 7,624 | 7624 | |
word problems
March 20th 2009, 11:42 PM
princess_21
word problems
how to do this? i'm confused..
If A, B, and C work together in a job, it will take 1 1/3 hours. If only A and B work, it will take 1 5/7 hours. But if B and C work, it would take 2 2/5 hours. How long would it take each man
working alone,... | 4 | [
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Simple Physics Sample Problems and Solutions
The following lists the eight sample problems and solutions used in the simple physics task. Note that the variable equations in these solutions pertain to the PC condition; for the NC condition
variable equations, refer to Table 10.1 in the book chapter.
Sample Problem:
T... | 4 | [
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0.06689453125,
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0.058837890625,
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-0.040283203125,
-0.015502929... | 7,626 | 7626 | |
Factoring Help - hw due help!
March 3rd 2008, 07:21 PM #1
dahcetmoht
Guest
Factoring Help - hw due help!
Math HW due.. need help tonight bad.
Need to factor the following
(If I erase some of the problems, its because someone already did them. thanks)
2. 27x^3-64
3. 3x^3+x^2-12x-4
Last edit... | 4 | [
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-0.0240478515625,
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-0.004638671875,
-0.0225830078125,
0.0869140625,
-0.0164794921875,
0.061767578125,
0.005279541015625,
-0.033447265625,
... | 7,627 | 7627 | |
One Linear Algebra Problem (Dual Spaces)
1. June 4th 2010, 08:07 AM #1
2. June 4th 2010, 04:09 PM #2
What's the problem? You need three polynomials $p_i(x)\,,\,i=1,2,3$ s.t. $f_i(p_j(x))=\delta_{ij}$.
For example, you need that $\int_0^1p_1(x)\,dx=1\,,\,\,\int^2_0p_1(x)\,dx=0\,, \,\int^{-1}_0p_1(... | 5 | [
-0.029541015625,
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... | 7,628 | 7628 | |
Playing with Equations to Solve Problems
Date: 09/16/2003 at 10:48:13
From: Mara
Subject: To state the geometric property of an equation
I need to give the geometric property common to all lines in the
family
x - ky = 1
I know that the answer is that all lines in this family have an
x-intercept at x=1 but I am t... | 4 | [
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0.0086669921875,
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Does Smith normal form imply PID?
up vote 7 down vote favorite
5
Let R be a commutative ring with a 1 different from 0, such that all finite matrices over R have a Smith normal form. Does it follow that R is a Principal Ideal Domain?
If not, what if R also has no zero divisors? (aka is an integral domain) What if add... | 4 | [
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0... | 7,630 | 7630 | |
Math Help
November 10th 2009, 07:37 AM #1
Member
Joined
Sep 2009
Posts
80
Tangency
Another problem I'm stuck on.
"If k >/= 1 (greater than or equal to 1), the graphs of $y=sin(x)$ and y=ke^-x intersect for x >/= 0. Find the smallest value of k for which the graphs are tangent. What are the coordina... | 4 | [
-0.005401611328125,
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0.048095703125,
-0.057... | 7,631 | 7631 | |
Factor group of an external direct product
October 7th 2007, 08:35 PM
tttcomrader
Factor group of an external direct product
Find the order of $Z \oplus Z | <(2,2)>$
Now, the elements in $Z \oplus Z$ are (0,0) and (1,1), so the order of it is 2. but I'm confuse about the second one, what is the order of tha... | 5 | [
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... | 7,632 | 7632 | |
D
Rutgers/Lucent ALLIES IN TEACHING MATHEMATICS AND TECHNOLOGY Grant
Using technology not simply to do things better, but to do better things.
... | 4 | [
-0.0303955078125,
0.0478515625,
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0.... | 7,633 | 7633 | |
Trigonometric inequality
December 20th 2008, 12:13 PM #1
Trigonometric inequality
This one is fun. Find what values of $x$ make $\cos(\sin(x))\geqslant\sin(\cos(x))$ true. Next find all values that make $\sin(\cos(x))\geqslant\cos(\sin(x))$ true.
Note: No calculus.
it's a pretty problem! it's always tru... | 5 | [
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0.10595703125,
-0.00799560... | 7,634 | 7634 | |
Stuck on this integral
March 25th 2010, 02:32 PM
dats13
Stuck on this integral
I am stuck on this integral and not sure how to go about it.
http://s3.amazonaws.com/answer-board...1962504667.gif
where A is a constant. I have tried multiply top and bottom by http://s3.amazonaws.com/answer-board...69625... | 5 | [
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0.... | 7,635 | 7635 | |
transforming from a non-exact to an exact linear differential equation
September 17th 2011, 11:42 AM
MacstersUndead
transforming from a non-exact to an exact linear differential equation
The question asks me to solve the following equation.
3(x^2 + y^2)dx+x(x^2 + 3y^2 + 6y)dy = 0
I verified that this f... | 4 | [
-0.08056640625,
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Null spaces, Ranges, Nullities, and Ranks
June 9th 2009, 07:35 PM #1
Member
Joined
Mar 2009
Posts
168
Null spaces, Ranges, Nullities, and Ranks
T:M(2x3) ---> M(2x2)
T $\left(\begin{array}{ccc}a_{11}&a_{12}&a_{13}\\a_{2 1}&a_{22}&a_{23}\end{array}\right)$ = $\left(\begin{array}{cc}2a_{11}-a_{12}&a_{1... | 5 | [
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0.049560546875,
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Falling body problem
November 18th 2009, 07:56 AM #1
Newbie
Joined
Nov 2009
Posts
4
Falling body problem
Given the acceleration function A(t)= 12t^2 + 2
A] Find the Velocity function V(t) with the initial condition when t = 0 then V = 7
B] Find the Distance function S(t) with the initial condit... | 5 | [
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0.00476074... | 7,638 | 7638 | |
Proving this
February 11th 2007, 07:24 AM #1
Member
Joined
Nov 2006
From
chicago
Posts
156
Proving this
Prove that:
[log_base a_(x)] / [log_base ab_(x)] = 1 + log_base a_(b), for all a, b >1 and x >0.
Thanks
Hello,
you know that log_a(x) = ln(x)/(lna)
The LHS of your equat... | 4 | [
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Triangle ABC...
January 25th 2011, 09:57 PM
mandarep
Triangle ABC...
Triangle ABC is isosceles with BC=AC. The coordinates of the vertices are A(6, 1) and B(2, 8).
Find the equation of the perpendicular bisector of AB.
If the x coordinate of C is 3.5, find the y coordinate of C.
Find the length of AB... | 4 | [
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0.0693359375,
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0.12060546875,
-0.078125,
-0.00958251953125,... | 7,640 | 7640 | |
proof
June 18th 2006, 06:37 PM
ling_c_0202
proof
i have got the question...
in triangle ABC, the lengths of the sides a, b, c have the relation 2b equals to a + c.
i. prove that 2 sin B equals sin A + sin C.
this part i have done...
but i can t handle the next part, which is
ii hence, show... | 4 | [
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Help
August 13th 2005, 11:19 PM
UKMUG
Help
:eek: I am having trouble with this one any help would be apprieciated.....
Two companies merge. Each company has high speed test machines as well as other test machines. One company has 400 chip test machines of which 20% are high speed. The combined company wil... | 4 | [
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Linear system solutions using Gauss-Jordan elimination
January 28th 2011, 10:35 AM
qaz
Linear system solutions using Gauss-Jordan elimination
$<br /> \left\{<br /> \begin{matrix}<br /> ax - 3y + z = a\\<br /> -x + 6y = -2\\<br /> x + 5z = 4\\<br /> \end{matrix}\right.<br />$
system matrix:
$<br /> \[<br... | 5 | [
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-0.04931640... | 7,643 | 7643 | |
Examine the consistence of the following eq
December 28th 2009, 02:28 PM #1
Banned
Joined
Dec 2008
From
Mauritius
Posts
523
Examine the consistence of the following eq
Question: Examine the consistency of the following system of equations:
2x - 5y +7z = 6
3x - 8y + 11z = 11
x - 3y +4z = ... | 4 | [
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-0.07373046875,
0.... | 7,644 | 7644 | |
Derivative of y=ln(lnx)
April 30th 2010, 02:56 PM #1
Member
Joined
Sep 2009
Posts
78
Derivative of y=ln(lnx)
Find the equation of the tangent line to the curve y=ln(lnx) which is perpendicular to the line ex+y =0
So I took the derivative and got 1/(xlnx)
I know that the slope of the normal line ... | 5 | [
-0.06396484375,
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... | 7,645 | 7645 | |
Conjugation of matrices.
September 30th 2010, 05:01 AM #1
Junior Member
Joined
Sep 2009
From
Johannesburg, South Africa
Posts
71
Conjugation of matrices.
def.: $SO(3)$ is the collection of lineair orthogonal transformations of $\mathbb{R}^3$, the elements are $3\times 3$ matrices.
I want to show... | 4 | [
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0.021240234375,
-0.009521484375,
-0.018310... | 7,646 | 7646 | |
Algebra: Factoring Fractions
Associated Topics || Dr. Math Home || Search Dr. Math
Algebra: Factoring Fractions
D... | 4 | [
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-0.0162353515625,
0.027... | 7,647 | 7647 | |
Min f `(x) d s.t (d^t)d = 1
March 1st 2011, 04:15 PM #1
Newbie
Joined
May 2009
Posts
8
Min f `(x) d s.t (d^t)d = 1
$<br /> \textup{min} f{}'(x)\textup{ }d$
$s.t \left \| d \right \|_{2}^{2} = 1$
$\textup{show }d = -\frac{f'(x)}{\left \| f(x) \right \|_{2}}$
$\textup{my attempt}$
$\textup{... | 4 | [
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-0.... | 7,648 | 7648 | |
Basic Math Problem
May 16th 2009, 11:57 AM
Aslam Anjum
Basic Math Problem
I need help on a question the questions says
by eliminating Y, find the solution to the Simulataneous Eqautions.
X(squared)+Y(squared)=25
Y=X-7
Thanks in Advance,
Aslam
May 16th 2009, 11:59 AM
artvandalay11
Pl... | 4 | [
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-0.043701171875,
-0.06494140625,
... | 7,649 | 7649 | |
in Scheme using derivatives
More resources
Related blog articles:
Papers:
Books:
Derivatives of regular expressions
The derivative of a regular expression with respect to a character computes a new regular expression that matches what the original expression would match, assuming it had just matched the character... | 4 | [
-0.04833984375,
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0.1025390625,
0.07763671875,
0.0224609375,
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-0.00066375732421875,
0.02392578125,
0.07568359375,
-0.0634765625,
0.05761... | 7,650 | 7650 | |
Limits
October 30th 2008, 09:54 AM
geeko
Limits
hey I got this question:
Question
lim x sin1/x=0
x->0
____________
answer
-1<=sin(1/x)<=1
-x<=xsin(1/x)<=x
lim -x = 0
x->0
lim x=0
x->0
-->lim x sin(1/x)=0 //MY answer
x->0
__________________
I ju... | 5 | [
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0.1005859375,
-0.08740234375... | 7,651 | 7651 | |
Algorithm for summing certain sums involving the floor function
up vote 7 down vote favorite
I managed to find an efficient algorithm (polynomial time in $P$,$Q$ and $N$) for the following sum:
$$\sum_{i=0}^{N} \lfloor iP/Q \rfloor,$$ where $P,Q$ are relatively prime positive integers. When $N=Q-1$ it's fairly easy t... | 4 | [
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0.07275390625,
0.036376953125,
0.09912... | 7,652 | 7652 | |
Paul's Blog
I upgraded to emacs 24 from emacs 23. I had a problem with gnus and getting mail via imap, which I couldn't immediately find a solution to via the usual mechanism of googling the error message.
It turns out that changing the value of gnus-secondary-select-methods from:
((nnimap "mail"))
to
((nni... | 4 | [
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-0.0361328125,
-0.026611328125,
-0.042... | 7,653 | 7653 | |
Finite subgroups of SL_2(Z) (reference request)
up vote 8 down vote favorite
9
I recently read the statement "up to conjugacy there are 4 nontrivial finite subgroups of $SL_2(\mathbb{Z})$." They are generated by
$\left(\begin{array}{cc} -1&0 \\\ 0&-1\end{array}\right), \left(\begin{array}{cc} -1&-1 \\\ 1&0\end{array}... | 5 | [
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0.0106201171875,
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0.09375,
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0.007171630859375,
-0.036376953125,
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Really Easy Question about Zeroes of a Polynomial
May 14th 2011, 08:52 AM #1
Really Easy Question about Zeroes of a Polynomial
Let $\mathbb{F}$ be a field, let $f \in \mathbb{F}[x]$ be a polynomial, and let $\alpha \in \mathbb{F}$.
Then I understand that if $(x-\alpha) | f$, then $f(\alpha) = 0$, this is obv... | 4 | [
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Word problems
May 9th 2013, 07:36 PM #1
Newbie
Joined
Jan 2013
From
Canada
Posts
5
Word problems
I have three questions i cant seem to figure out, any help would be appreciated.
1) find two numbers whose sum is 84 such that the product of one number and the cube of the other number is a maximum
... | 4 | [
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Math Forum: Teacher2Teacher - Q&A #7379
Teacher2Teacher Q&A #7379
Teachers' Lounge Discussion: Volume of a sphere
... | 4 | [
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exponential growth
November 17th 2010, 09:39 PM #1
Junior Member
Joined
Feb 2010
Posts
52
exponential growth
The question is if the population takes 20 years to triple, how many years does it take to double.
$\displaystyle y'=Ce^{k20}$
We know that the population in 20 years ( $y_{20}$) is trip... | 5 | [
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0... | 7,658 | 7658 | |
Generated subgroup
July 9th 2009, 07:38 AM #1
Generated subgroup
Hi,
So... I've decided to study some algebra, to see if I can handle it... lol
I've come accross this (very basic) question, which may rather be set theory, but the original question is algebra :
Let G be a group. Let H be a subgroup c... | 5 | [
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Single Trig Functions
July 14th 2010, 07:35 PM
nuckers
Single Trig Functions
Write the following as a single trigonometric function
$1/2sin12xcos12x$
1/2 is a half, and the x value is theta, i wasn't sure how to do it that way. The question i have is this supposed to be 12theta, or should it be 2theta.... | 4 | [
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Trig identity
$\sin^{3}{x}(1+\cot{x})+\cos^{3}{x}(1+\tan{x}) = \cos^{2}{x} - \sin^{2}{x}$ $\sin^{3}{x}+ \sin^{3}{x}\cot{x} + \cos^{3}{x} +\cos^{3}{x}\tan{x}= \cos^{2}{x} - \sin^{2}{x}$ $\sin^{3}{x} + \cos^{3}{x} +
\sin^{3}{x}\frac{\cos{x}}{\sin{x}} + \cos^{3}{x}\frac{\sin{x}}{\cos{x}}= \cos^{2}{x} - \sin^{2}{x}$ Now fa... | 4 | [
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surface integrals
February 28th 2009, 05:42 AM #1
Member
Joined
Jan 2009
Posts
83
surface integrals
evaluate double int over S (e^z) dS
where S is the surface of the sphere x^2 + y^2 + z^2 = a^2
I know dS = a^2(sintheta)(d.theta)(d.phi) using the parametrization
r = (a.sintheta.cosphi,a.sin... | 4 | [
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0.... | 7,662 | 7662 | |
Can we say anything about the Krull dimension of a localization?
up vote 5 down vote favorite
3
I'm looking for a theorem of the form
If $R$ is a nice ring and $v$ is a reasonable element in $R$ then Kr.Dim$(R[\frac{1}{v}])$ must be either Kr.Dim$(R)$ or Kr.Dim$(R)-1$.
My attempts to do this purely algebraically... | 5 | [
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0... | 7,663 | 7663 | |
Probabilistic inventory models
May 12th 2009, 08:58 PM
veronica.white
Probabilistic inventory models
The campus bookstore must decide how many textbooks to order for a course that will be offered only once. The number of students who will take the course is a random variable D whose distribution
can be appro... | 5 | [
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Very quick math question
10-24-2005
jverkoey
Very quick math question
<edit>
Bah, after re-reading my post I guess it's not a very quick question. :rolleyes: </edit>
So I just took a midterm, and one of the questions was as follows:
Code:
lim (1-x^2)
x->+inf -------
(3+x)
I found ... | 5 | [
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Surface Area of Revolution
December 9th 2011, 11:17 AM
Ahasueros
Surface Area of Revolution
Hi,
I had a question concerning the Surface area of a curve being rotated.
Question: rotate the curve (e^x) on the interval [0,1] and calculate the surface area.
I know how to set up an integral and such, but ... | 5 | [
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Continuous Probability
October 18th 2009, 06:43 PM
jas213
Continuous Probability
Continuous Probability Distributions- Statistics can someone solve the below problem?
Specialty faces the decision of how many Weather Teddy units to order fr the coming season. Members of the management team suggested order qu... | 4 | [
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... | 7,667 | 7667 | |
Slope of a Circle
December 12th 2007, 04:04 PM #1
Member
Joined
Oct 2007
Posts
178
Slope of a Circle
...is $y'=\frac{-x}{y}$
My book says the second derivative of a circle is also $y''=\frac{-x}{y}$
Every time I do it, I get $y''=\frac{-y}{x}$
So what is the 2nd derivative of a circle?
... | 5 | [
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-0.0100708007... | 7,668 | 7668 | |
Integral Volume
January 25th 2011, 10:11 AM #1
Newbie
Joined
Feb 2009
Posts
21
Integral Volume
I have the examples above and we are supposed to get the volume of each based on the cross sections above. The circle is x^2+y^2=16
Given that Volume = integral between a and b of A(x) dx so I came... | 5 | [
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... | 7,669 | 7669 | |
Graphs with Holes - Concept
Brightstorm is like having a personal tutor for every subject
See what all the buzz is about
Check it out
Graphs with Holes - Concept 8,565 views
Rational functions have points where they are undefined, which introduces us to graphing holes in the function. Graphing holes involves being ... | 4 | [
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-0... | 7,670 | 7670 | |
grrr, this assn is giving me a lot of troubble 2 more ?, and then I'll be done
December 17th 2007, 04:12 AM
Luckegrl_16
grrr, this assn is giving me a lot of troubble 2 more ?, and then I'll be done
1) If tan (theta) = 1/2, the value of tan (4pi/3 - (theta)) = a (sq.root of b) - c. Find a, b, and c.
THANKS.... | 4 | [
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Is there an extension of the Arzela-Ascoli theorem to spaces of discontinuous functions?
up vote 8 down vote favorite
2
The Arzela-Ascoli function basically says that a set of real-valued continuous functions on a compact domain is precompact under the uniform norm if and only if the family is pointwise bounded and
eq... | 4 | [
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joint probability mass function
March 24th 2008, 06:28 PM #1
Junior Member
Joined
Feb 2008
Posts
63
joint probability mass function
from a deck of 52 cards,,, 13 are chosen at random. Calculate the joint probability mass function of the #'s of hearts, clubs, diamonds and spades that are selected.
La... | 4 | [
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-... | 7,673 | 7673 | |
external direct products
March 3rd 2008, 04:59 AM #1
Newbie
Joined
Mar 2008
Posts
2
external direct products
Definition: External Direct Products
Let G and K be two groups. Define GxK by
GxK= { (g,k) I gEG, kEK }
with the operation * defined on GxK by
(g1,k1) * (g2,k2) = (g1g2,k1k2) f... | 4 | [
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0... | 7,674 | 7674 | |
Area Under a Parabola
Date: 06/27/97 at 08:16:19
From: George Osbert Matthew
Subject: Calculus
Why is the area of a parabolic segment equal to b^3/3?
Date: 06/27/97 at 10:04:44
From: Doctor Rob
Subject: Re: Calculus
This formula is the area in the first quadrant (x >= 0, y >= 0)
bounded by the line x = b and the ... | 5 | [
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... | 7,675 | 7675 | |
Need help calculating margin of sampling error and confidence interval!
April 1st 2009, 10:51 PM
thecleric
Need help calculating margin of sampling error and confidence interval!
Problem:
Assume that the following random samples are taken from populations with normal distributions. In each case, find the mar... | 4 | [
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divergence theorem problem
May 3rd 2008, 01:43 PM #1
Senior Member
Joined
Feb 2008
Posts
321
divergence theorem problem
i hav another small question about calculus.please help...
F= (x^3+2xy^2,y^3+2yz^2,z^3+2zx^2) is a vector field.
fine integral( F.dS) on a sphere of radius R centered at the o... | 4 | [
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0.02966308593... | 7,677 | 7677 | |
chain rule for outer products involving the gradient operator?
March 10th 2013, 03:06 PM
TriKri
chain rule for outer products involving the gradient operator?
Hi, I'm gonna calculate the Jacobian matrix of the following function:
$f(r) = \frac{(r\cdot v)r}{r^2}$
where $r$ is the position. Since all var... | 4 | [
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0.15136... | 7,678 | 7678 | |
AP Calculus - Minimizing Time Traveled
Date: 12/22/98 at 11:54:51
From: Heidi Mergenthaler
Subject: AP Calculus
Dear Dr. Math,
Here is a problem that our AP Calculus teacher did not know how to
solve:
A person on a boat in a lake is 9 km from the shore and must go to a
point 12 km down the shoreline in the shortes... | 5 | [
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0.006103515625,... | 7,679 | 7679 | |
Taylor series
Talk0
872pages on
this wiki
Taylor series are a type of power series that are often employed by computers and calculators to approximate transcendental functions. They are used to convert these functions into infinite sums that
are easier to analyze. The partial sums of the Taylor series are called... | 5 | [
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-0.0280... | 7,680 | 7680 | |
Math Forum Discussions
Re: (difficult)Theoretical gambling puzzle (solution?)
Posted: Jul 26, 2006 7:42 AM
Hi,
Here are the initial values given by my method:
2+2 => 2/3
3+3 => 17/20
4+4 => 1
5+5 => 47/42
6+6 => 284/231
7+7 => 4583/3432
8+8 => 18457/12870
9+9 => 74131/48620
10+10 => 26995/16796
-- Eric
At 08:13 26... | 4 | [
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... | 7,681 | 7681 | |
Basic word problem I can't set up.
June 20th 2013, 10:20 PM
Cake
Basic word problem I can't set up.
Two angles are supplementary. One angle is 24 degrees more than twice the other. Using two variables x and y, find the measure of each angle.
Okay, so supplementary = 180 degrees.
x + y = 180 degrees.... | 4 | [
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0.07421875,
-0.0223388671875,
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0... | 7,682 | 7682 | |
Factor for X; Consecutive Odd Integers
Date: 01/19/98 at 14:30:29
From: Sarah
Subject: Algebra factoring
(x-2)(x+3) = 6 Solve by factoring for x.
Also...
Label your variables, write an equation, solve, label answers.
Find three consecutive odd integers such that the sum of the first,
twice the second, and three ... | 4 | [
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0.053466796875,... | 7,683 | 7683 | |
Math Help
November 26th 2009, 11:06 AM #1
Resources...
Hi I was wondering if I could ask some maths resources. I'm going to take my Maths GCSE several years early and I asked my school for some past papers but they have frighteningly little.
Please could someone divert me to a large cache of past papers and... | 4 | [
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0.0020599365234375,
... | 7,684 | 7684 | |
Having sign problem with algebraic fractions
January 26th 2013, 05:48 PM
KevinShaughnessy
Having sign problem with algebraic fractions
Hi,
I'm having a problem with an algebraic fractions equation. It goes:
5/3(v-1) + (3v-1)/(1-v)(1+v) + 1/2(v+1)
The first thing I do is factor out the negative in ... | 4 | [
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-... | 7,685 | 7685 | |
Matrix Algebra
Date: 06/01/98 at 06:32:02
From: Andrea Quintiliani
Subject: a problem in matrix algebra
Hello, I've been trying to help my son with his school work, and have
come upon a problem that I've not been able to solve. I'm a graduate
in physics and have asked other colleagues, but nobody seems to come
up wi... | 5 | [
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0.03051... | 7,686 | 7686 | |
[SOLVED] epsilon/delta limit in R^n. supposedly easy, but I need to learn the ropes
October 26th 2009, 07:34 PM
hatsoff
[SOLVED] epsilon/delta limit in R^n. supposedly easy, but I need to learn the ropes
Quote:
Use the epsilon/delta definition to find and prove the limit:
$\lim_{\textbf{X}\to\textbf{X}... | 5 | [
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Quantum Numbers and Rules
There are two more quantum numbers of immediate concern. Both were first discovered for electrons in conjunction with fine structure in atomic spectra. It is now well established that electrons and
other fundamental particles have intrinsic spin, roughly analogous to a planet spinning on its a... | 4 | [
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... | 7,688 | 7688 | |
Linear Programming
December 19th 2008, 09:31 AM
help me please2008
Linear Programming
I need help with solving the following problem:
Annabelle Sizemore has cashed in some treasury bonds and a life insurance policy that her parents had accumulated over the years for her. She has also saved some money in cert... | 4 | [
0.0003528594970703125,
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-... | 7,689 | 7689 | |
Help differentiating sin(x)^x
November 11th 2010, 08:31 AM #1
Newbie
Joined
Nov 2010
Posts
2
Help differentiating sin(x)^x
Hi,
How do you differentiate sin(x)^x for all real numbers? How do you even define sin(x)^x for all real numbers?
I'm having problems doing this rigorously. Sure you can us... | 5 | [
0.020263671875,
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-0.052001953125,
0.00946044921875,... | 7,690 | 7690 | |
The meaning of the curvature
September 29th 2009, 05:39 PM #1
Member
Joined
Dec 2008
Posts
228
The meaning of the curvature
Basically, the curvature of a curve at a given point measures how quickly the curve changes direction at that point. But what exactly does that mean? What "direction" changes.... is... | 4 | [
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... | 7,691 | 7691 | |
Given Irrational Numbers a,b, Is a^b Rational?
Date: 09/26/2001 at 13:53:30
From: JM
Subject: Irrational numbers
Is it possible to demonstrate that there are irrational numbers a, b,
where, when calculating a^b, the result is a rational number?
I've proved it is not impossible because, for example, e^(lna) = a,
and... | 5 | [
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0.059... | 7,692 | 7692 | |
Simplifying Algebraic Expressions
Date: 03/23/2002 at 19:01:45
From: Heidi Callahan
Subject: Simplifying Algebraic Expressions
I am looking for guidelines to follow when simplifying algebraic
expressions (for simple expressions and more complex expressions).
Are there certain rules to follow?
Date: 03/27/2002 at ... | 4 | [
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Machine Shop 2 - Lathe Cutting Speeds - RPM Calculations
There are rules and principles of cutting speeds and R.P.M. calculations that apply to all metal cutting operations. The operating speed for all metal cutting operations is based on the cutting tool
material and the hardness of the material to be cut. In this uni... | 4 | [
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-0.0261230468... | 7,694 | 7694 | |
Strongly decreasing sequence of sets
November 14th 2010, 03:50 PM
hjortur
Strongly decreasing sequence of sets
This was a homework question few weeks ago, and the teacher didn't give
out the solution to this problem (it doesn't directly concern complex analysis), so I was wondering weather someone knows the ... | 4 | [
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-0.... | 7,695 | 7695 | |
Math Help
October 13th 2009, 12:13 PM #1
Newbie
Joined
Sep 2009
Posts
17
Show how...
... n(n-1 C r) = (r+1)(n C r+1)
I can only get the left side n (n-1)! / r! (n-1-r)! = (r+1)(n C r+1)
$LHS = n \frac{(n-1)!}{r! (n - 1 - r)!} = \frac{n (n-1)!}{r! (n - 1 - r)!} = \frac{n!}{r! (n - r - 1)!}$
... | 4 | [
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Riemannian Geometry
5.7 Riemannian Geometry
Investigations like the one just made, which begin from general concepts, can serve only to ensure that this work is not hindered by too restricted concepts, and that progress in comprehending the
connection of things is not obstructed by traditional prejudices.
... | 4 | [
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Proof: Metric Space
December 6th 2005, 11:24 AM
TexasGirl
Proof: Metric Space
Let (X,d) be a metric space and let D:X*X-->R be defined by:
D(x,y) = (0 if x=y), (max(1,d(x,y)) otherwise)
Prove that (X,D) is a metric space.
I know that I have to show (X,D) is positive definite, symmetric and satisfi... | 4 | [
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Power losses in wound components
Outlined here are the various causes of inefficiency, methods of estimating them and techniques for minimizing them.
Your life as a designer of transformers, for example, would be far simpler if you did not need to worry about power losses; you would simply select a part having the tu... | 4 | [
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