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Enumerative combinatorics, graph theory, order theory, posets, matroids, designs and other discrete structures. It also includes algebraic, analytic and probabilistic combinatorics.

22 votes
1 answer
749 views

Low-level proof of identity related to Weierstrass P-function

A theorem which can be extracted from Theorem V.1.1 of Silverman's "advanced topics in the theory of elliptic curves" is the following. Here $\mathbb{Q}(u)$ denotes rational functions in a variable $u …
3 votes
Accepted

A question on linear recurrence

I don't know what "dominating" means so perhaps this isn't a counterexample, but how about $-p(x)=x^5 - x^4 - x^3 - x^2 + x + 1=(x^2-x-1)(x^3-1)$ (which has a unique real root greater than 1), with $a …
Kevin Buzzard's user avatar
31 votes

What to do when your research runs into a computationally challenging problem?

When faced with a computationally intractable problem, here's one way of making progress: give up! Here's why giving up might turn out to be a good idea. Sometimes I feel "if I could just compute a f …
Kevin Buzzard's user avatar
9 votes

Neutral tic tac toe

For what it's worth, here are a summary of the answers so far for the Misere game: 1x1: P2 win (poisoned chalice) 2x2: P1 win (P1 makes an arbitrary move) 3x3: P1 win (P1 plays in the centre, and h …
Kevin Buzzard's user avatar
9 votes
Accepted

Equality of the sum of powers

An even harder problem than $t>2$ and $n=m$ is the Prouhet–Tarry–Escott problem. Now I leave it to you and google to find lots of examples ;-) http://en.wikipedia.org/wiki/Prouhet-Tarry-Escott_proble …
Mariano Suárez-Álvarez's user avatar