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Results tagged with co.combinatorics
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user 18693
Enumerative combinatorics, graph theory, order theory, posets, matroids, designs and other discrete structures. It also includes algebraic, analytic and probabilistic combinatorics.
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Enumerating Perfect Lattices
I have a question regarding enumeration of perfect lattices/quadratic forms. In the thesis of Achill Schürmann http://fma2.math.uni-magdeburg.de/~achill/public/habil.pdf there is an algorithm called " …
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Traversing perfect quadratic forms
I am wondering whether there is an efficient algorithm to traverse all the $N\times N$ perfect quadratic forms $Q$ inside the polyhedron $e_j^T Q e_j \geq 1$, $j = 1\ldots m$, where $e_j$ are some giv …
- 149
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Question regarding contiguous forms
I read about contiguous forms in Achill Scürmann's thesis on positive quadratic forms. I am wondering about one aspect of the Voronoi algorithm presented in there, that enumerates all arithmetically i …
- 149