Proportional transitivity in linear extensions of ordered sets
نویسندگان
چکیده
منابع مشابه
On extensions, linear extensions, upsets and downsets of ordered sets
We consider the problem of characterizing the set (P ) of all extensions of an order P on a set of elements E, where |E| = n, |P | = m and is the number of extensions of the order. Initially, we describe two distinct characterizations of (P ). The first characterization is a one-to-one correspondence between extensions of P and pairs of upsets and downsets of certain suborders of P . The second...
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ژورنال
عنوان ژورنال: Journal of Combinatorial Theory, Series B
سال: 1986
ISSN: 0095-8956
DOI: 10.1016/0095-8956(86)90027-4