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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.

5 votes
2 answers
207 views

matroids representable over root of unity partial fields that are not the 6th root of unity ...

On reading about matroids representable over partial fields, one learns about the 6th root of unity partial field, but other even-th root of unity partial fields seem to be absent from the standard re …
Karen Yeats's user avatar
10 votes
1 answer
167 views

necklace reconstruction in the permutation case

Suppose I want a necklace with $n$ beads labelled (bijectively) by $\{1, 2, \ldots n\}$, that is I want a cyclic order on $\{1, 2, \ldots, n\}$ (so for example $132$ is the same cyclic order as $321$ …
Karen Yeats's user avatar