Bisimilarity of Pushdown Systems is Nonelementary

Published 29 Oct 2012 in cs.FL and cs.LO | (1210.7686v1)

Abstract: Given two pushdown systems, the bisimilarity problem asks whether they are bisimilar. While this problem is known to be decidable our main result states that it is nonelementary, improving EXPTIME-hardness, which was the previously best known lower bound for this problem. Our lower bound result holds for normed pushdown systems as well.

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