Equivalence of pushdown automata via first-order grammars
arXiv:1812.03518 · doi:10.1016/j.jcss.2020.07.004
Abstract
A decidability proof for bisimulation equivalence of first-order grammars is given. It is an alternative proof for a result by Sénizergues (1998, 2005) that subsumes his affirmative solution of the famous decidability question for deterministic pushdown automata. The presented proof is conceptually simpler, and a particular novelty is that it is not given as two semidecision procedures but it provides an explicit algorithm that might be amenable to a complexity analysis.
version accepted to JCSS