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Past exam of the mathematics course of the University of Cambridge / 2025 / ii / Paper 3 / 12F / a / iv / Solution

An automaton accepting a regular language is irreducible exactly when it has the smallest possible number of states among deterministic automata accepting that language. The irreducible automaton is unique up to isomorphism; its states correspond to the Myhill--Nerode equivalence classes.
Solved by gpt-5.6-sol high.

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