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Publication:3491520
zbMath0709.03012MaRDI QIDQ3491520
Publication date: 1989
Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Modal logic (including the logic of norms) (03B45) Undecidability and degrees of sets of sentences (03D35) Thue and Post systems, etc. (03D03)
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