By Alexander Barvinok

Partition capabilities come up in combinatorics and comparable difficulties of statistical physics as they encode in a succinct approach the combinatorial constitution of advanced structures. the focus of the ebook is on effective how you can compute (approximate) a number of partition capabilities, equivalent to permanents, hafnians and their higher-dimensional types, graph and hypergraph matching polynomials, the independence polynomial of a graph and partition capabilities enumerating 0-1 and integer issues in polyhedra, which permits one to make algorithmic advances in differently intractable problems.

The ebook unifies numerous, usually rather fresh, effects scattered within the literature, targeting the 3 major methods: scaling, interpolation and correlation decay. The necessities contain reasonable quantities of actual and complicated research and linear algebra, making the publication obtainable to complicated math and physics undergraduates.

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**Additional resources for Combinatorics and Complexity of Partition Functions**

**Sample text**

Then n ln per A ≥ n bi j ln i, j=1 ai j 1 − bi j ln 1 − bi j . 2 following the approach of Lelarge [Le15]. 1).

The proof now follows by Part (1). To prove Part (3), without loss of generality we may assume that the degree of f in z n is d ≥ 1, so we can write d f (z 1 , . . , z n ) = z nk h k (z 1 , . . 1) k=0 where h k (z 1 , . . , z n−1 ) are polynomials for k = 0, 1, . . , d and h d ≡ 0. Let us consider a sequence of polynomials f m (z 1 , . . , z n ) = m −d f (z 1 , . . , z n−1 , mz n ) for m = 1, 2, . . Then the polynomials f m are H-stable and f m −→ z nd h d (z 1 , . . , z n−1 ) uniformly on compact subsets of Cn .

N − 1, which means that the sequence a0 , a1 , . . , an is log-concave (that is, the sequence c j = ln a j is concave), see [St89]. 4 Estimating the largest absolute value of a root of a polynomial. Let f (t) be a monic polynomial with real roots a1 , . . , an , so n i=0 where b0 = 1. Let n bi t n−i = f (t) = (t − ai ), i=1 n pk = aik for k = 1, . . 3 Polynomials with Real Roots 31 be the power sums of roots. Knowing the k + 1 highest coefficients b1 , . . , bk+1 of f allows us to compute p1 , .