Unboundedness and Downward Closures of Higher-Order Pushdown Automata

13 Jul 2015Matthew HagueJonathan KochemsC. -H. Luke Ong

We show the diagonal problem for higher-order pushdown automata (HOPDA), and hence the simultaneous unboundedness problem, is decidable. From recent work by Zetzsche this means that we can construct the downward closure of the set of words accepted by a given HOPDA... (read more)

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