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Satisfiability of Context-free String Constraints with Subword-ordering and Transducers by Aiswarya, C; Mal, Soumodev; Saivasan, Prakash is a scholarly article available to read on EtoBox.

What is Satisfiability of Context-free String Constraints with Subword-ordering and Transducers about?

We study the satisfiability of string constraints where context-free membership constraints may be imposed on variables. Additionally a variable may be constrained to be a subword of a word obtained by shuffling variables and their transductions. The satisfiability problem is known to be undecidable even without rational transductions. It is known to be NExptime-complete without transductions, if the subword relations between variables do not have a cyclic dependency between them. We show that the satisfiability problem stays decidable in this fragment even when rational transductions are added. It is 2NExptime-complete with context-free membership, and NExptime-complete with only regular membership. For the lower bound we prove a technical lemma that is of independent interest: The length of the shortest word in the intersection of a pushdown automaton (of size $O(n)$) and $n$ finite-state automata (each of size $O(n)$) can be double exponential in $n$.

Author

Aiswarya, C; Mal, Soumodev; Saivasan, Prakash

Published

2024

Language

EN