Math

What is the Last Digit of PI?
I have a friend who claims that the last digit of PI is "7". Is this correct? Thanks, Datesfat ... 8 Feb 2010 11:06

Factorization into Primes using Gray code and full parity
Greetings, I have just come across very interesting work along the lines of my area of interest. Gerard Langlet discovered a very interesting connection between his "parity integral", Gray Code, and prime factorization. Here is a link to his publication in French: http://sboisse.free.fr/science/maths/factor... 4 Feb 2010 12:19

Question about complex functions
What are the conventions regarding "extended values" for complex numbers. For example, if z(x) = tan x + i * cos x, What can be said of lim x --> pi/2+ of z(x)? Many thanks. ... 4 Feb 2010 14:36

How much surface area contact between Elliptic and Hyperbolic geometry? #385 Correcting Math
Now I am looking at a pseudosphere on Wikipedia page and then looking at a saddle shape. I have a problem of fetching what the analog of a specific pseudosphere to a sphere is. Whether the radius of the sphere is the analog to the pseudosphere and what to use for the saddle shape. Anyway, what I am trying to ... 4 Feb 2010 04:28

Two questions on finite-dimensional algebras
Let k be an algebraically closed field, and A a finite dimensional k-algebra. Let l(A) denote the number (of isomorphism classes) of simple A-modules. 1) Why is l(A) <= dim(A)? This seems like it should be easy, but I don't really see it immediately. 2) If e and b are two idempotents in A, why are the A-modules A... 4 Feb 2010 03:23

35 Days
35 days to March 9. ... 4 Feb 2010 20:15

A problem in divergent summation/matrix-methods/Eulerian numbers
Hi - some monthes ago I fiddled with the subject of divergent summation using matrix-transformations, namely using the matrix of Eulerian-numbers E = 1 0 0 0 ... 1 0 0 0 ... 1 1 0 0 ... 1 4 1 0 ... 1 11 11 1 ... ... ... If we use the matrix to write the double... 3 Feb 2010 06:09

Cantor's Diagonal?
Hi all, I have some difficulty digesting the diagonal argument of Cantor's. The argument is that the set of all infinite binary sequences cannot have a bijection to the set of all natural numbers, thereby proving that the former set is uncountable? However the argument looks to me to be so designed as to rea... 14 Feb 2010 00:53

The metric system sucks
I. Introduction LEFTIST POLITICS is one of the great errors of our age. [ By leftism I mean specifically the quasi-religious crusading ideology identified by Ted Kaczyncki (I always have trouble spelling that name!), and not (as he pointed out) any policies that happen to fall on the left-wing side (which I supp... 23 Feb 2010 13:35

connecting Luminet-Poincare Dodecahedral Space with AP-Reverse -Concavity for 10% #379 Correcting Math
Alright I am making some good excellent progress here. I already have the 10% I need in that the 36 degree arc twist in the Poincare Dodecahedral Space. And it is Finite, thanks to the Luminet team of researchers that our Universe is best seen as finite. So I have everything working in my favor. Now I am try... 2 Feb 2010 16:45