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

Feb2313 09:23 AM
micromass

1 
38,207 
Hi,
I'm having some trouble understanding what is meant when the limit of a summation is i<j. Does it mean the...

Nov407 12:37 PM
arildno

1 
3,261 
I'm stuck on how to approach the following problem.
lim_{x \rightarrow \infty} \sum_{j=0} ^x e^{j/x}
Does...

Feb610 08:59 AM
Apteronotus

5 
960 
How can one prove that:
lim (x,y)>(0,0)
(x^4+y^4)

(x^2+y^2)
= 0

Apr1103 12:50 PM
HallsofIvy

14 
1,825 
How do i show that
lim h>0 (sqrt(a*b)*h)/h does not exist at 0
so far i have
lim h>0+ h/h =1
and...

Apr1305 06:40 PM
master_coda

20 
4,793 
If we have an exponential fuction,
(for example)
Limx>∞ e(x2+2x+1)/(x23)
Would we first determine the limit...

Jun1711 01:39 PM
BloodyFrozen

41 
2,573 
Hi all having a little problem with finding the limits on the area between 2 graphs.
i can find the easy one such...

Jun1305 07:06 AM
Struggling

8 
2,506 
The question is as follows:
\frac{lim}{h\rightarrow0} \frac{\sqrt{1+h}1}{h}
I don't know if the way I approached...

Sep1708 07:47 PM
susan__t

3 
8,610 
The question asks to find a value for a and b that makes f continuous everywhere.
f(x)=
\frac{x  4}{x2} ,...

Sep2208 07:45 PM
HallsofIvy

4 
2,689 
A positive number epsilon (e) and a limit L of a function f at a are given. Find delta such that f(x)L< epsilon if...

Sep809 02:44 PM
John O' Meara

4 
5,093 
Find the smallest positive number N such that for each x in the interval (N,+infinity) the value of f(x)=...

Sep1509 08:30 PM
John O' Meara

5 
1,257 
I recently found the proof that lim x> 0 sinx/x = 1...

Oct2906 06:36 PM
courtrigrad

1 
1,177 
My text book failed to address how to find the epsilon and the delta of a Limit. Can somebody explain to me what they...

May3103 04:54 PM
NEOclassic

30 
2,397 
i need to compute lim (a^nb^n)^(1/n) when a>b>0.
lim ((3n)!/((2^3n)n!(2n!)))^(1/n) where i need to use the lemma...

Aug311 10:51 AM
wisvuze

25 
6,669 
Wot do u have to do to prove that an intergral exists.?? I know how to do it if the integrals bounds are given (...

Apr2504 06:01 AM
saint_n

2 
1,733 
Given a liear code generated by 01111, 11010 and 10100 how do you calculate the cosets of C? Does this mean because it...

May1611 08:50 PM
Rubik

4 
994 
I'm doing math from correspondance, so I have no one to ask.
But to find the length of an altitude from a point to a...

Apr1706 02:40 PM
jim mcnamara

1 
847 
When you have a line's equation, and are asked to find the equations of the 2 parallel lines to it, which are 2 units...

Jun907 02:59 PM
Joza

2 
920 
I have a simple question.
Assume we have 2 points in 3D space with known coordinates:
#1 (x1,y1,z1)
and
#2...

Sep2906 04:52 AM
HallsofIvy

2 
15,419 
(I don't study math in English so I'm not sure what the exact terms are... please bear with me. :))
If you have...

Nov1703 04:22 PM
Chen

2 
5,650 
Question:
Starting from any one of the three corners of the path described here under,evaluate the line integral...

Apr1405 08:08 AM
snoble

9 
6,063 
Can anyone recommend an online reference or book on line integrals and parameterization that's clear and concise?
...

Jun1303 10:58 PM
Greg Bernhardt

3 
4,013 
I have to evaluate this line integral in the complex plane by direct integration, not using Cauchy's integral...

Apr1111 03:34 AM
tinytim

8 
2,071 
The question is compute the integral over c of (x/y) where c is the line segment from (2,4) to (5, 25) followed by the...

Dec611 06:24 AM
HallsofIvy

2 
840 
Suppose I have a vector V and I want to compute for the line integral from point (1,1,0) to point (2,2,0) and I take...

Dec712 06:03 AM
mathsciguy

2 
682 
If you have a curve integral, what is the conceptual or physical difference between integrating G(x,y)dx, G(x,y)dy and...

Feb1007 11:08 PM
arunma

1 
1,167 
I have a rough idea of what a line integral is, please correct me if I am wrong:
If a function y=f(x) is being...

Apr608 12:05 PM
chaoseverlasting

2 
1,004 
Hi,
I am currently studying complex numbers and I am at the part we have to find line integrals over a simple...

Oct1908 11:29 PM
chota

0 
959 
I have a series of points on a 2 dimensional plane that form a polygon.
Somewhere inside the polygon I have another...

Dec305 07:53 PM
Joffe

2 
1,186 
Hi all,
I'm having problems with something I'd like to do.
Basically I have a 3D scatter plot and would like to...

Sep2911 09:46 PM
LCKurtz

2 
3,121 
How do I find the line of intersection of two planes? I have an idea, but both of the planes have a 2z
ie. ...

May2805 10:13 AM
mattmns

9 
13,527 
Hi,
I am having difficutly figuring out why the cross product of the normal vectors of each plane gives the direction...

Sep2010 03:58 PM
mathman

3 
2,158 
Hi everybody,
I would like to ask two things:
1)What is the line of real numbers? Is it just a graphical way of...

Mar1105 07:07 AM
HallsofIvy

11 
5,067 
What is line of support of a vector ? I could not find it anywhere on google !

Mar2210 11:52 AM
tinytim

1 
788 
If you were to describe a line segment as the set where all of its infinite points were individual elements within the...

Aug2309 06:29 PM
TacTics

3 
956 
If you were to imagine a line segment of length pi, I would guess it would have to be finite. But since pi is an...

Jan3110 01:00 PM
Werg22

5 
1,671 
Hi! I cannot get this definition of angle a:
cos a = u * v / (u * v)
and how it match up with
u * v = u...

Apr205 11:51 AM
Data

9 
1,926 
Hello,
This might sound like a dumb question but can one learn Linear Algebra before Calculus?
Thank you.

Jun2008 10:47 PM
maze

9 
26,157 
Hey guys,
I have recently decided that i wanna try to selflearn some more math along with what im doing in high...

Nov308 04:28 AM
lurflurf

3 
15,131 
I am trying to simplify the following, so that I can differentiate it (with respect to X). Ideally I'll have...

Nov708 02:20 PM
tinytim

15 
2,766 
Can someone give me a layman’s terms explanation of what a null space is .

Apr1910 02:53 PM
TacTics

4 
1,458 