
Please post any and all homework or other textbookstyle problems in one of the Homework & Coursework Questions...

Feb2313 09:24 AM
micromass

1 
46,282 
Though this problem came to me when studying thermodynamics, it's purely mathematical and seems to be easy, but I'm...

May3111 09:03 PM
Hobold

1 
1,096 
Given an equation in the form 0 = ax2 + bx + c, why is it not possible to simply differentiate both sides, and produce...

May3111 06:56 PM
lavinia

18 
3,815 
You know how some integrals can't be solved. But is it possible to solve some of these integrals by rotation of axis...

May3111 01:22 PM
cragar

17 
1,622 
can anybody tell me the expansion for the divergence of tensor vector product
\nabla.(\tilde{K}.\vec{b})
for the...

May3111 12:43 PM
tinytim

1 
1,934 
Im curios as to why the inquality is
x+y\leqX+y
but the end of the proof is
=(x+Y)^2
...

May3111 04:42 AM
3.1415926535

1 
1,151 
My question is how to compute R(dx). But before I can ask that I have to write down the background to my problem, so...

May3011 04:14 PM
I like Serena

17 
1,275 
Hi, have worked out the formula for a hyperbolic spiral space curve to be r(t)=1/t X cos(alpha)+1/t X sine(alpha) + t...

May3011 03:54 PM
trustthrust

2 
1,028 
I'm trying to learn some analysis on my own, and as this is the first proofbased book I'm reading, I have a basic...

May3011 12:45 PM
TylerH

3 
1,467 
Here's what I have
>Integral:=proc(f,i)
local JExact,S,R,E;
JExact:=int(f,x=0..1);
...

May2911 10:56 PM
iFargle

1 
1,189 
Hi, so this morning I made an attempt at this... With javascript (website programming language) I was able to...

May2911 03:54 PM
mburt

2 
2,080 
In analysis we were shown the existence of nonLebesgue measurable sets (eg a choice function over the rational...

May2911 03:06 PM
dimitri151

2 
1,112 
This question is directed toward people who have a copy of the textin other words, I'm too lazy to retype the whole...

May2811 08:57 PM
micromass

3 
1,968 
Hi, I'm looking at a past paper for an exam I have on Tuesday and I'm struggling to understand this question on exact...

May2811 05:35 PM
spamiam

1 
1,004 
I know that if \forall x \in E \subset \mathbb{R}^n we have f(x) \le g(x) then it is true that \int_E f \le...

May2811 01:37 PM
micromass

3 
1,055 
Hey guys, I have a quick question.
Suppose we have a function f that is integrable over a set S \subset...

May2811 11:39 AM
JG89

6 
1,076 
the support of a function is defined as the closure of the set where f is nonzero
my question is why not just...

May2811 01:52 AM
Stephen Tashi

2 
859 
I am trying to understand wikipedia's definition of convolution: http://en.wikipedia.org/wiki/Convolution#Definition ....

May2711 08:52 PM
paulfr

5 
2,376 
I am studying a problem that want's me to show that differentiable function at z0 is continuous at z0 = x0 + iy0.
It...

May2711 07:37 PM
Hodgey8806

6 
2,795 
Hi everyone!
Here's my problem:
Let's suppose that we have a functional I=\int{L(f,\dot{f},g,\dot{g},x)\,dx}.
...

May2711 12:37 PM
lennyleonard

6 
1,783 
I'm reading this journal article and they keep on using the notation
\int_{R^d}
What does this mean, just say...

May2711 07:33 AM
cernlife

2 
1,181 
I'm interested how to solve the following problem:
if we have a triangle, where a,b,c are sides of that triangle and...

May2711 03:28 AM
Chuckster

6 
1,489 
i'm battling unsuccessfully to find a delta epsilon proof for continuity of exponential function.
this is what i've...

May2611 09:19 PM
dimitri151

23 
5,285 
I know the derivative is cosx but I don't know what to do.
So I get the derivative of sinx down to:...

May2611 09:17 PM
iRaid

3 
907 
I'm trying to evaluate the derivative of the Riemann zeta function at the origin, \zeta'(0), starting from its...

May2611 07:45 PM
TriTertButoxy

7 
2,717 
given the function
arg\xi(1/2+is)
is this an increasing function of 's' ?? , i mean if its derivative is...

May2611 05:05 PM
henry_m

1 
801 
This is not a bookquestion by far. It does have a nice solution, but I am stumpled on how to get it
...

May2611 08:27 AM
Nebuchadnezza

5 
954 
There the well known theorem that every open set (I'm talking about R here with standard topology) is the union of...

May2511 09:03 PM
dimitri151

6 
3,366 
1) Fact: Let X be a metric space. Then the set X is open in X.
Also, the empty set is open in X.
Why??
2)...

May2511 03:11 PM
jbunniii

10 
5,429 
Hi, I want to know if there's a general method of changing variables of a function and reduce the original number of...

May2511 02:45 PM
Jaynte

1 
884 
Hi, this is a very basic question. I want to know why are implicit functions used, when the purpose of functions is to...

May2511 02:15 PM
Tosh5457

10 
2,180 
I hope this is the right place to post this question. I saw this equation on a car's back windshield. I don't know...

May2511 11:17 AM
arildno

3 
722 
Fix some constant 0<\alpha \leq 1, and denote the floor function by x\mapsto . The conjecture is that there exists a...

May2511 07:44 AM
micromass

3 
1,195 
I consider an array of lattice points and construct a vector at each lattice points.
How to convert this discrete...

May2511 12:40 AM
saravanan13

2 
938 
In the Tsiolkovsky rocket equation derivation there is a part that says:
\frac{dV}{dt} = \upsilon_e \frac{1}{m}...

May2411 07:36 PM
LogicalTime

6 
2,791 
Nevermind I figured it out ec{w}?

May2411 07:20 PM
Gebraroest

0 
568 
Ok,
So i have a problem understanding conflicting results of a derivative,
Consider the derivative of x2, which is...

May2411 06:19 PM
gb7nash

4 
1,404 
I am trying to calculate the following integral
I=\int_0^\infty\frac{x}{(x+ia)^2}...

May2411 12:21 PM
JJacquelin

14 
2,166 
\int_{\infty}^{+\infty}\frac{e^{x^2}}{\sqrt{x^2+1}}dx
I calculated it numerically, but I need an exact number....

May2411 09:54 AM
DivisionByZro

3 
1,017 
Hi guys,
I've been doing past paper questions for an exam and I've gotten stuck with the limits of an integral. We...

May2411 08:21 AM
tinytim

5 
917 
As well known, for any topological space (X,T), there is a smallest measurable space (X,M) such that T\subset M. We...

May2311 06:29 PM
linulysses

9 
1,693 