This paper gives a method for computing the reduced poset homology of the rank-selected subposet of a distributive lattice. As an example of the method, let L be the lattice S b acts on L by permuting coordinates. For S โ [ab], we give a description of the decomposition of the reduced homology of L
On the widths of finite distributive lattices
โ Scribed by Jeff Kahn; Michael Saks
- Publisher
- Elsevier Science
- Year
- 1987
- Tongue
- English
- Weight
- 707 KB
- Volume
- 63
- Category
- Article
- ISSN
- 0012-365X
No coin nor oath required. For personal study only.
โฆ Synopsis
The following conjecture of U Faigle and B Sands is proved: For every number R > 0 there exists a number n(R) such that if 2 is a finite distributive lattice whose width w(Z) (size of the largest antichain) is at least n(R), then IZ/a Rw(Z). In words this says that as one considers ~ increasingly large distributive lattices, the maximum sized antichain contains small proportion of the elements.
๐ SIMILAR VOLUMES
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