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A Bit of Nondeterminism Makes Pushdown Automata Expressive and Succinct

A bit of nondeterminism makes pushdown automata expressive and succinct
Authors: Guha, Shibashis; Jecker, Ë; Lehtinen, Karoliina; Zimmermann, Martin; Jecker, I;

A Bit of Nondeterminism Makes Pushdown Automata Expressive and Succinct

Abstract

We study the expressiveness and succinctness of history-deterministic pushdown automata (HD-PDA) over finite words, that is, pushdown automata whose nondeterminism can be resolved based on the run constructed so far, but independently of the remainder of the input word. These are also known as good-for-games pushdown automata. We prove that HD-PDA recognise more languages than deterministic PDA (DPDA) but not all context-free languages (CFL). This class is orthogonal to unambiguous CFL. We further show that HD-PDA can be exponentially more succinct than DPDA, while PDA can be double-exponentially more succinct than HD-PDA. We also study HDness in visibly pushdown automata (VPA), which enjoy better closure properties than PDA, and for which we show that deciding HDness is ExpTime-complete. HD-VPA can be exponentially more succinct than deterministic VPA, while VPA can be exponentially more succinct than HD-VPA. Both of these lower bounds are tight. We then compare HD-PDA with PDA for which composition with games is well-behaved, i.e. good-for-games automata. We show that these two notions coincide, but only if we consider potentially infinitely branching games. Finally, we study the complexity of resolving nondeterminism in HD-PDA. Every HDPDA has a positional resolver, a function that resolves nondeterminism and that is only dependant on the current configuration. Pushdown transducers are sufficient to implement the resolvers of HD-VPA, but not those of HD-PDA. HD-PDA with finite-state resolvers are determinisable.

Countries
Germany, France, Denmark, Denmark
Keywords

FOS: Computer and information sciences, Computer Science - Logic in Computer Science, Logic, Formal Languages and Automata Theory (cs.FL), Computer Science - Formal Languages and Automata Theory, Pushdown Automata, Succintness, Formal languages and automata, [INFO] Computer Science [cs], computer science - logic in computer science, Synthesis, Formal Languages and Automata Theory, Computer Science, BC1-199, Logic in Computer Science, Theory of computation → Formal languages and automata theory, QA75.5-76.95, Good-for-games, 004, Logic in Computer Science (cs.LO), computer science - formal languages and automata theory, Electronic computers. Computer science, Computer Science, ddc: ddc:004

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
1
Average
Average
Average
Green
Published in a Diamond OA journal