4
votes
2answers
233 views
Visualizing a graph
I have a finite but huge metric graph with say 1000 vertices.
It comes say as 10000x10000 symmetric matrix filled by $0,1,\dots$ and $\infty$;
0's on the diagonal and $\infty$ is f …
58
votes
23answers
6k views
Examples of theorems misapplied to non-mathematical contexts
For something I'm writing -- I'm interested in examples of bad arguments which involve the application of mathematical theorems in non-mathematical contexts. E.G. folks who make t …
23
votes
14answers
2k views
Interesting mathematical topics arising from Biology
I've heard that there's a relatively new field of science called Mathematical Biology.
It will certainly apply well known and less known mathematical techniques to the understandi …
0
votes
0answers
98 views
How to approximate a distribution using a random perturbation of the distribution
Suppose $f(0)=0$ and you want to simulate $f(Z)$ for some random variate $Z$ that you can generate. However, you can only obtain values of $f(Y+Z)$ and $f(Y)$ for some other variat …
1
vote
0answers
166 views
Distribution of random vectors
Two positive numbers $\alpha$ and $\beta$ are given. We are going to describe a process of choosing a random vector on the unit sphere $S$ in $\mathbb R^3$ (given by $x^2+y^2+z^2=1 …
1
vote
1answer
144 views
Approximating $\prod_{i=1}^{n-1} (1-ai)$ for large $n$
I have a function of the form:
$f(n) = \prod_{i=1}^{n-1} (1-ai)$
Here, $a \geq 0$ and $(a*i) < 1$. For $n > 10^5$ or $10^6$, what is the best possible analytic approximation …
12
votes
1answer
563 views
2/3 power law in the plane
I've recently come across a particular problem whose solution turns out to be a probability distribution given by $f(x) = \alpha \|x\|^{-2/3}$ in the unit disk in $\mathbb{R}^2$ an …
0
votes
1answer
140 views
Regular Perturbation Series soln to eqn
I want to find the a 3 term perturbation soln of
(i) $(1+x)^3 = ex$ where $e\ll1$
Direct substitution of the regular perturbation series $x = x_0 + ex_1 + e^2x_2$
into (i) d …
2
votes
5answers
970 views
Matlab book recommendation
Which book or books do you recommend that cover advanced engineering topics and problem solving using matlab?
I already finished a very good introductory book and i want something …
1
vote
2answers
653 views
Rotationally-Invariant 2D Discrete Transforms
Hello all,
I'm interested in 2D discrete transforms (such as discrete wavelet transforms, Curvelets, Ridgelets, Beamlets etc.) that operate on a discrete unit disk and:
Are inva …
1
vote
1answer
415 views
name for $\underset{x}{\operatorname{argmin}} \displaystyle\sum\limits_{i=1}^n |x_i - x|$
Given a real-valued data set $ x_1, \dots, x_n $, what do you call the quantity
$$\underset{x}{\operatorname{argmin}} \displaystyle\sum\limits_{i=1}^n |x_i - x|$$
This seems like …
6
votes
4answers
1k views
Applications of commutative algebra
Hi. I'm preparing a thesis in commutative algebra, and when I say this to my friends they always ask me what are the applications to "real-world", and I don't know what to answer. …
11
votes
1answer
768 views
On the non-rigorous calculations of the trajectories in the moon landings
In a paragraph written by a person emphasizing that rigour is not everything in mathematics (I wish I had written down the details), it was stated that the moon landings would have …
2
votes
2answers
1k views
Physical Meaning of Constant Velocity Gradient
I'm interested in representing homogeneous elastic deformations using Lie groups/algebras. Homogeneous deformations are those with a deformation gradient F which depends only on ti …
1
vote
4answers
963 views
Applied linear algebra textbook? [closed]
I have a copy of Linear Algebra Done Right, which I worked through years ago in college. I have been using that book to refresh my knowledge, but it does not have an applied or co …

