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Results tagged with co.combinatorics
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user 23571
Enumerative combinatorics, graph theory, order theory, posets, matroids, designs and other discrete structures. It also includes algebraic, analytic and probabilistic combinatorics.
35
votes
Why do wedges of spheres often appear in combinatorics?
This is indeed a mystery. I presume the question refers to wedges of spheres of the same dimension, where there's a simple criterion (n-dimensional and (n-1)-connected, for some n). For wedges of sph …
- 20k
4
votes
Accepted
Discriminants of indefinite integral binary quadratic forms admitting 3 or 6 torsion.
The structure of the automorphism group becomes clear when one looks at the Conway topograph of a given form. For an indefinite form not representing 0 the topograph has an infinite periodic river se …
- 20k