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

Feb2313 09:25 AM
micromass

1 
30,367 
Suppose a set of k arbitrary points, x_i, 1<=i<=k, x_i from R^2 are selected from a line. How can it be shown that a...

Oct2912 11:34 AM
Vargo

6 
1,144 
Find the vertices of α(t) = 1  2 cos(t)
I know that to find the vertices we have to set the curvature equal to...

Oct2912 08:02 AM
lavinia

2 
1,005 
Hi
Given is a triangle on points x,y,z in the plane. This triangle has two points a and b on opposite sides (see...

Oct2712 02:00 AM
chiro

7 
1,153 
prove that for any graph G, kappa (G) ≤delta (G).

Oct2712 01:14 AM
Bacle2

3 
1,105 
Can someone please confirm that there is a typo in Nakahara's Geometry, Topology, and Physics, on page 319 (the last...

Oct2612 12:15 PM
mathwonk

3 
1,474 
I shall use Seidel's definition of a Liouville domain; in particular, a Liouville domain is a compact manifold M ...

Oct2412 06:34 AM
quasar987

1 
892 
Does anyone know where I can find an algorithm for the points of intersection of two ellipses existing with arbitrary...

Oct2312 09:34 PM
Norwegian

1 
1,568 
Hi,
I've run into a problem with expanding algebraic functions via Newton polygons. Consider the function:
...

Oct2312 01:13 PM
mathwonk

5 
1,475 
Hello, I've just started learning about asymptotes in school. The questions I have are:
1. To find the vertical...

Oct2212 10:51 AM
mathwonk

1 
768 
I was working on some algebraic topology matters, thinkgs like the connected sum of some surfaces is some other...

Oct2112 12:37 AM
julypraise

5 
1,288 
I had doubts whether to post this here or in in the physics section but I did here because I'm more interested in a...

Oct2012 02:56 PM
Muphrid

91 
9,598 
Let $$M$$ be a surface with Riemannian metric $$g$$. Recall that an orthonormal framing of $$M$$ is an ordered pair of...

Oct2012 07:24 AM
Bacle2

2 
1,019 
Hi,
You guys know of any (software) function which accepts as input an aribtrary algebraic function, then computes...

Oct1812 07:53 PM
mathwonk

6 
1,536 
How do you calculate the Normal vector to an Ellipse.
Radius Vector:
r=rx*i + ry*j + rz*k
Velocity Vector:...

Oct1812 04:48 PM
Philosophaie

15 
3,718 
Let $$(M,g)$$ be an oriented Remannian surface. Then globally $$(M,g)$$ has a canonical area2 form $$\mathrm{d}M$$...

Oct1812 08:34 AM
quasar987

4 
961 
Let $$f:U \to \mathbb{R}^3$$ be a surface, where $$U=\{(u^1,u^2)\in \mathbb{R}^2:u^1<3, u^2<3\}.$$ Consider the...

Oct1812 03:34 AM
semigroups

0 
741 
Hi,
I need to do this for some homework and I don't really understand... could anyone help with the following...

Oct1712 11:14 PM
coalquay404

1 
1,019 
I'm trying to write an algorithm that will create the smallest possible ellipse to encompass any number of points on...

Oct1712 11:40 AM
Physt

4 
1,173 
Take for example, the function:
a_0(z)+a_1(z)w+a_2(z)w^2+a_3(z) w^3+a_4(z)w^4+a_5(z)w^5=0
with the degree of ...

Oct1712 06:28 AM
jackmell

0 
839 
I am having trouble getting a set definition of what constitutes a manifold for example ,
I have the real plane...

Oct1512 11:59 PM
Bacle2

24 
2,134 
I got these people trying to say that you can orientate a solid oblong so that it looks half the length and width with...

Oct1512 10:34 PM
Simon Bridge

3 
1,128 
Suppose I'm given a random function:
(8+5 z+4 z^2)\text{}+(7 z+6 z^47 z^5)w+(3 z^2z^3)w^2+(8 z2 z^42...

Oct1512 08:18 AM
jackmell

0 
867 
I'm not sure if this is the right forum.
I'm actually trying to solve this for a computer program
given shape A...

Oct1312 10:10 PM
Muphrid

1 
1,405 
Hi, buddies, i am a mechanical engineering student, and while i was going through the concepts of Instant centers of...

Oct1212 09:37 PM
anandtr2006

0 
946 
If I start out with a flat beam of length a and then I fix one side and then bend the other side up to form an arc...

Oct1212 06:33 PM
Studiot

1 
1,448 
Can an ellipse's focal points be outside the ellipse? I have tried googling this, but without any good explanations or...

Oct1112 10:06 AM
HallsofIvy

4 
1,330 
Hello there,
This might be probably a simple question, but my wondering was:
Is there any relation between the...

Oct1012 01:36 PM
mathwonk

3 
1,013 
Hi all,
I am trying to understand geometric flows, and in particular the Ricci flow. I understand how to calculate...

Oct1012 12:29 PM
meldraft

8 
2,150 
I want to calculate the surface area of semi cylinder with one or both ends skew at a given angle. To calculate the...

Oct1012 12:28 AM
smstoankur

3 
1,527 
Given a Finsler geometry (M,L,F) and $$g_{ab}^L=\frac{1}{2} \frac{\partial^2 L}{\partial y^a \partial y^b}$$...

Oct812 05:29 AM
ngkamsengpeter

0 
843 
I'm developing a game for the iPhone, and I have a situation where I have a graphic that the user can drag around the...

Oct412 06:57 AM
MaTHFRo

0 
822 
in the wikipedia page for the Levi Civita symbol, they have a definition of the product of 2 permutation symbols as: ...

Oct312 07:34 PM
demonelite123

2 
3,506 
\frac{}{}Hello,
I've been trying to search for a general description for the Euclidean distance from a point to a...

Oct312 05:03 PM
heymaniknowyou

7 
1,637 
The relation between the vector operator curl and rotation in fluids and vector fields is treated thoroughly in many...

Oct112 08:11 AM
Paulibus

10 
1,647 
hey all,
in this book ;...

Sep3012 09:05 AM
zn5252

1 
1,197 
How do you solve ((grad(f(x,y,z))))^2?

Sep2912 08:04 PM
quantumfoam

17 
3,879 
I'm having trouble understanding the exponential map for nonlinear vector fields.
If dσ/dt=X(σ)
for vector field...

Sep2912 06:39 PM
quasar987

5 
1,401 
I posted this in yahoo questions, but perhaps this is a better place for it.
The Tesseract assumes that in order to...

Sep2912 01:38 PM
laserblue

14 
3,176 
This is really starting to bug me.
I built an object out of tooth picks and glue.
It's simple. An...

Sep2812 08:15 AM
Alfi

1 
1,217 
I have two vectors:
r1v=r1x*i + r1y*j + r1z*k
r2v=r2x*i + r2y*j + r2z*k
and
r1=Math.sqrt(r1x^2 + r1y^2 +...

Sep2712 10:31 PM
Muphrid

2 
1,087 