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A note on neutral elements in posets

✍ Scribed by B. N. Waphare; Vinayak Joshi


Book ID
111493032
Publisher
SP Versita
Year
2009
Tongue
English
Weight
379 KB
Volume
59
Category
Article
ISSN
0139-9918

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