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

Feb2313 09:24 AM
micromass

1 
40,144 
I need to show that:
\lim_{x \to 0} x^{2}sin(1/x)=0
Using the epsilondelta method. I figured delta=sqrt would...

Aug2609 12:30 PM
╔(σ_σ)╝

3 
1,225 
I reasoned that (x1)/x is always less than 1 for positive x. Therefore it will tend to zero as the exponent tends to...

Aug2509 10:48 PM
n1person

2 
3,390 
With DFT/FFT/SFTF or similar fourier transforms, there's always a trade off between frequency and time resolution....

Aug2509 12:27 PM
John Creighto

3 
1,576 
Hi everyone!
There's a question bothering me about the two coordinate systems  cylindrical and spherical:
...

Aug2509 07:27 AM
Marin

2 
2,802 
Note this is not a homework assignment. I was generally learning about integrating volumes and thought that after...

Aug2409 09:02 PM
DocZaius

2 
2,587 
give an example to show that it is not true in general that
sup(AB)= (supA)(supB) and inf(AB)=(infA)(inf B)

Aug2409 06:11 PM
quasar987

1 
587 
Let H be a separable Hilbert space and let {e_k} be a Hilbert basis (aka total orthonormal sequence) for H. Then
...

Aug2409 10:25 AM
quasar987

2 
1,359 
Hi there!
I am trying to prove the following 2 identities using complex analysis methods and contour integration...

Aug2409 09:32 AM
Marin

7 
1,569 
A very vague question:
What is the derivative of the gamma function?
Here's what I've got, using differentiation...

Aug2309 08:14 PM
n1person

5 
10,729 
What method can I use to find an asymptotic expansion for an integral of the form
\int_a^b g(k)\left^tdk
where...

Aug2309 02:47 AM
mvillagra

0 
579 
Hey guys, so this may be a really silly question, but I'm trying to grasp a subtle point about higherorder...

Aug2209 11:41 PM
VKint

1 
1,101 
I am very interested in math and I find calculus to be a particularly interesting subject, but one major problem I...

Aug2209 11:40 PM
n1person

7 
3,143 
What is idea for showing this?
\int\int\ldots\int dx_1 dx_2\ldots dx_n e^{a x^\top A x}=\sqrt{\frac{\pi^n}{\det...

Aug2209 09:09 AM
g_edgar

1 
629 
i am familiar to the this limit:
\lim_{x\rightarrow 0} sin(x)/x=1
my question is does cosine,tg and cot have a...

Aug2109 11:16 PM
Elucidus

20 
7,773 
If
lim as y>infinity = (1/2)* ,
What is A(x,y)?

Aug2109 09:56 PM
redphoton

2 
953 
Hello all,
I am stuck on what seems like a rather simple problem:
Let f:\mathbb{R}^3 \rightarrow \mathbb{R} and...

Aug2109 10:04 AM
TacTics

3 
982 
I had this integral \int \frac{dy}{2y + 6}.
I realize you can let u = 2y + 6 so that du = 2dy, and adjusting:...

Aug2109 12:53 AM
Unit

6 
850 
In one of my electronics textbooks I have the following equation related to feedback in amplifiers:
K_f =...

Aug2009 11:40 PM
bitrex

2 
751 
Hi, can someone give me a hand with this "little" integral please.
\int...

Aug2009 07:37 PM
mvillagra

4 
877 
For a function sin(2x)^(1/2) in ]0, pi/2[ counts:
D2(f) + f = 3*D(a) where Da stands for the a'd derivative
So is...

Aug2009 02:51 PM
JanClaesen

10 
1,148 
Given two sequences (hyperreal numbers):
(2,1,2,1....) and (1,3,1,3...) how can I order these? They are not...

Aug2009 12:25 PM
Bourbaki1123

6 
637 
How would I evaluate the integral \int\int\int_{G} \sqrt{4x^2+9y^2} dV,
where G is the elliptic cylinder 4x2+9y2...

Aug1909 05:47 PM
squenshl

7 
816 
Show that the evaluation of the pullback of a constant 1form k_{1}dx + k_{2}dy + k_{3}dz over the directed line...

Aug1909 04:38 PM
Reb

1 
1,015 
I am considering the set of all bounded signals given by
X = \left\{ x:\ x(t) \leq X_{\max}, \forall t...

Aug1909 04:00 PM
Reb

3 
622 
Taylor's Inequality states:
if f n+1(x)<=M
then
Rn(x)<=M*xa^(n+1)/(n+1)!
however,
Rn(x)=f...

Aug1809 03:46 PM
HallsofIvy

1 
897 
How do you prove a function is invertible using calculus? I have a question on my review packet and it says to show...

Aug1809 02:38 PM
TacTics

6 
8,639 
How do I evaluate the triple integral \int\int\int_G x+y+z dV using a suitable change of variable where G is the...

Aug1709 05:20 PM
squenshl

5 
874 
How do u tak the derivative of
X = (cos@)/(sin@)
dx/d@ = ????

Aug1709 08:31 AM
Дьявол

9 
717 
This Fall, I'll be an incoming freshman taking my school's equivalence to "Intro. to Proofs" class. However, I've been...

Aug1709 01:53 AM
Edgardo

18 
1,832 
\sum_{n=1}^{\infty}(1)^{n}\frac{e^{\frac{1}{nx}}}{n}
Where 0<x<oo.
I'm looking for a closed form/ closed...

Aug1609 06:31 PM
rman144

5 
1,673 
Like many people on this forum, i am seemingly having a lot of trouble grasping the concepts of Epsilon Delta proofs...

Aug1609 06:09 PM
patata

2 
869 
Can someone please correct my working out...
\frac{\beta^2}{(x1)(x2)}  \frac{\beta^2}{(x1)^2}
...

Aug1609 12:11 AM
confused88

2 
683 
How would I evaluate the triple integral \int\int\int_H(x^2+y^2) dV,
where H is the region bounded x2 + y2 = 1, y =...

Aug1509 11:18 PM
squenshl

3 
659 
Given the triple integral \int\int\int_{G} xyz dV
Where G is the region bounded by x=1, y=x, y=0, z=0, z=2.
How do I...

Aug1509 08:36 PM
squenshl

2 
2,093 
given only f ' (x) , is it possible to find the slope of the secant for a given x_1 and x_2 without integrating?
If...

Aug1509 05:44 AM
arildno

13 
917 
I was given this review problem in limits.
LimX > inf. (1  X + X2)1/2  aX  b = 0.
I was asked to find a and...

Aug1509 01:22 AM
WiFO215

4 
737 
Dear friends,
I am a new member of physics forums, so this is may new message.
Already thanks to you for your...

Aug1409 01:56 PM
HallsofIvy

3 
3,379 
What can I conclude using the following theorem?
Let the functions u_n (x) be continuous on the closed interval ...

Aug1409 01:04 AM
jostpuur

6 
816 
ok I wanna clear my broad views upon calculus..
first of all I wuz taught calculus 23 years back with differentials...

Aug1409 12:36 AM
berkeman

6 
942 
Recently I have begun thinking about the function x^x. I am well aware that there is no elementary function to define...

Aug1309 05:59 PM
BigT

6 
1,264 