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Results tagged with co.combinatorics
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user 1384
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 …
- 41.4k
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 …
- 41.4k
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 …
- 41.4k
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 …
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 …
- 41.4k