MathDB2 problems
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Perrin–Schützenberger's commutative equivalence conjecture for finite codes
Perrin–Schützenberger's conjecture. Every code is commutatively equivalent to a prefix-free code.
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Schützenberger's maximal-code commutative equivalence conjecture
Schützenberger's conjecture. Every maximal code is commutatively equivalent to a prefix-free code.