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arxiv: 2603.05380 · v1 · pith:3PNO24ISnew · submitted 2026-03-05 · 💻 cs.FL

History-Deterministic B\"uchi Automata are Succinct

classification 💻 cs.FL
keywords automatonuchihistory-deterministicstatesactivelyautomatabeencombination
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We describe a history-deterministic B\"uchi automaton that has strictly less states than every language-equivalent deterministic B\"uchi automaton. This solves a problem that had been open since the introduction of history-determinism and actively investigated for over a decade. Our example automaton has 65 states, and proving its succinctness requires the combination of theoretical insights together with the aid of computers.

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