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Berkowitz's Algorithm and Clow Sequences

Michael Soltys
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Abstract

We present a combinatorial interpretation of Berkowitz's algorithm. Berkowitz's algorithm is the fastest known parallel algorithm for computing the characteristic polynomial of a matrix. Our combinatorial interpretation is based on ``loop covers'' introduced by Valiant, and ``clow sequences.'' Clow sequences turn out to capture very succinctly the computations performed by Berkowitz's algorithm, which otherwise is quite difficult to analyze. The main contribution of this paper is a proof of correctness of Berkowitz's algorithm in terms of clow sequences.

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Michael Soltys. 2002-01-31. Berkowitz's Algorithm and Clow Sequences. https://arxiv.org/abs/math/0201315

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