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Results tagged with co.combinatorics
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user 2122
Enumerative combinatorics, graph theory, order theory, posets, matroids, designs and other discrete structures. It also includes algebraic, analytic and probabilistic combinatorics.
6
votes
2
answers
653
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How many vertices of a polytope can be chopped off to produce a k-vertex facet?
Let P be a simple n-facet d-polytope with facet F, and let F have k vertices. Let H be a halfspace and Q be a simple (n-1)-facet polytope such that H ∩ Q = P.
In terms of k, what is an upper bound on …
- 275
5
votes
2
answers
407
views
How are graph automorphisms are affected by transformations?
I have a heavily symmetric regular graph whose automorphisms I know. I remove one subgraph and insert another one in a consistent manner; for example, this could be a Delta-Y transformation (replacin …
- 275