A separator theorem for graphs of bounded genus
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FOCS '96 Proceedings of the 37th Annual Symposium on Foundations of Computer Science
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We study families of Boolean circuits with the property that the number of gates at distance t fanning into or out of any given gate in a circuit is bounded above by a polynomial in t of some degree k. We prove that such circuits require size \Omega(n^{1+1/k}/\log n) to compute several natural families of functions, including sorting, finite field arithmetic, and the ``rigid linear transformations'' of [Valiant, 1977]. Our proof develops a ``separator theorem'' in the style of [Lipton and Tarjan, 1979] for a new class of graphs, and our methods may have independent graph-theoretic interest.