Hello, Could someone point me to a paper having the difference of solvable word problem in polynomial time and linear time? Many thanks...

Hello assume that x(t) and y(t) are doubly periodic functions with incommensurable frequencies u and v, (u/v is irrational) i.e. x(t) = sum_n,m{...

In deriving the functional calculus for a (possibly unbounded) self- adjoint operator A on a Hilbert space, one typically proceeds by defining f(A) for a nice algebra of...

In "Surely You're Joking," Feynman claims that he was able to evaluate several tough integrals by "differentiating under the integral sign" (a.k.a. using the Leibinz integral...

Dear colleagues - The University of East Anglia invites applications for an indefinite lectureship in Pure Mathematics from candidates who are engaged in internationally...

Hello When considering the subgroup of pure braids, it is possible to write each pure braid as a unique product of so called "combed braids" i.e pure braids such that all...

This post is made to ask for comments about relationship between time scales and exterior derivative. First of all, I willl describe the situation: Taylor's Formula has a...

Is it possible to come up with a general solution for a first order, non-homogenous, linear difference equation with varying coefficients? In other words, does the following...

I am trying to find any reference to the following: Let G be a Lie group with Lie algebra g. On the trivial principal G-bundle over g there is a natural connection whose...

Problem: Let n and k be fixed natural numbers such that n k. Let set N contain the natural numbers from 1 to n, N = {1,2, ... n}. Let S(k) be the set of all subsets of N...

Hi all Announcing the release 1.0 of vfplot, a program for plotting two dimensional vector fields http://sview01.wiredworkplace.net/pub/vfplot/ features: - curved arrows

Question: Let V and V' be two complex varieties in C^n for some fixed n. Is it decidable whether V and V' are isomorphic as algebraic varieties? If this is not so, what is...

Someone once told me about a conjecture that I think was called the "++- conjecture" (due to Borwein perhaps?) that had something to do with the coefficients of a power...

Could anyone give references on the parameter dependence of the behaviour of the series a_{n+1}=a_{n}^2+\alpha a_{1}=\beta Even the case \alpha=\beta might be interesting...

Take the following definition for the k-th homotopy group \pi_k(X,q) of a space X at q \in X: fix p \in S^k and call I the closed unit interval; then \pi_k(X,q) is the set of...

Moderator: Real address is . Posting address is bogus. ************************************************************************** The iterated exponential...

A question related to J.H.Conway's groups Co0 and Co1 ----------------------------------------------------- The group Co0 is the group of automorphisms of the Leech lattice...

Also available at http://math.ucr.edu/home/baez/week265.html May 25, 2008 This Week's Finds in Mathematical Physics (Week 265) John Baez Today I'd like to talk about the...

Also available at http://math.ucr.edu/home/baez/week264.html May 18, 2008 This Week's Finds in Mathematical Physics (Week 264) John Baez Here's a puzzle. Guess the next...

I've just recently had a look at rooted trees and wrote up a short pedagogical note on the subject at http://tcjpn.spaces.live.com/ under "A Walk in the Woods with Cayley and...