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A Note on Blockers in Posets

✍ Scribed by Anders Björner; Axel Hultman


Book ID
105764655
Publisher
Springer
Year
2004
Tongue
English
Weight
183 KB
Volume
8
Category
Article
ISSN
0218-0006

No coin nor oath required. For personal study only.


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For any poset P let J(P) denote the complete lattice of order ideals in P. J(P) is a contravariant functor in P. Any order-reversing map f: P-+Q can be regarded as an isotone (= order-preserving) map of either P\* into Q or P into Q\*. The induced map of J(Q) to J(P\*) (resp. J(Q\*) into J(P)) will