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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.

1 vote
2 answers
410 views

Partitions into 0,1, and 2 with a partial sum condition.

On a tangent to a problem I've been working on, I've run into a combinatorial/partition-theoretic problem that I wondered if anyone had run into before. Let $N$ be a positive integer, and ad-hoc-ly …
Cam McLeman's user avatar
  • 8,467
10 votes

Spencer-Brown's claimed proof of the four color theorem

I spent some time with this a couple of years ago out of curiosity, but did not make it any farther than you're like to be able to find online. The water is definitely murky. Here is a discussion of …
Cam McLeman's user avatar
  • 8,467