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- W2141017071 abstract "A linear extension of a poset $P$ is a permutation of the elements of the set that respects the partial order. Let $L(P)$ denote the number of linear extensions. It is a #P complete problem to determine $L(P)$ exactly for an arbitrary poset, and so randomized approximation algorithms that draw randomly from the set of linear extensions are used. In this work, the set of linear extensions is embedded in a larger state space with a continuous parameter ?. The introduction of a continuous parameter allows for the use of a more efficient method for approximating $L(P)$ called TPA. Our primary result is that it is possible to sample from this continuous embedding in time that as fast or faster than the best known methods for sampling uniformly from linear extensions. For a poset containing $n$ elements, this means we can approximate $L(P)$ to within a factor of $1 + epsilon$ with probability at least $1 - delta$ using an expected number of random bits and comparisons in the poset which is at most $O(n^3(ln n)(ln L(P))epsilon^{-2}ln delta^{-1}).$" @default.
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- W2141017071 date "2010-10-24" @default.
- W2141017071 modified "2023-09-28" @default.
- W2141017071 title "Using TPA to count linear extensions" @default.
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