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by Hans Jiirgen Prsmel, Angelika Steger, Anusch Taraz
http://www.informatik.hu-berlin.de/~proemel/publikationen/PST00.ps.gz
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Abstract:

We determine the approximate number of partial orders with a fixed number of comparable pairs, give a complete description of the evolution of partial orders and prove that infinitely many phase transitions occur. This answers questions posed by Dhar, Kleitman, and Rothschild 20 years ago.

Citations

17 Asymptotic enumeration of partial orders on a finite set – Kleitman, Rothschild - 1975
5 Asymptotic enumeration of partially ordered sets – Dhar - 1980
5 The number of finite topologies – Kleitman, Rothschild - 1970
3 Entropy and phase transitions in partially ordered sets – Dhar - 1978
3 A phase transition on partial orders, Physica 96A – Kleitman, Rothschild - 1979
1 Counting partial orders with a fixed number of comparable pairs – Pr6mel, Steger, et al.