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Results tagged with co.combinatorics
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user 56379
Enumerative combinatorics, graph theory, order theory, posets, matroids, designs and other discrete structures. It also includes algebraic, analytic and probabilistic combinatorics.
7
votes
2
answers
448
views
What is the number of noncrossing acyclic digraphs?
A noncrossing graph on $n$ vertices is a graph drawn on $n$ points numbered from $1$ to $n$ in counter-clockwise order on a circle such that the edges lie entirely within the circle and do not cross e …
- 195
12
votes
3
answers
1k
views
Is every graph an edge-crossing graph?
Consider a circular drawing of a simple (in particular, loopless) graph $G$ in which edges are drawn as straight lines inside the circle. The crossing graph for such a drawing is the simple graph whos …
- 195