Constructive Logic and the Medvedev Lattice

We study the connection between factors of the Medvedev lattice and constructive logic. The algebraic properties of these factors determine logics lying in between intuitionistic propositional logic and the logic of the weak law of the excluded middle (also known as De Morgan, or Jankov, logic). We discuss the relation between the weak law of the excluded middle and the algebraic notion of join-reducibility. Finally we discuss autoreducible degrees
Keywords intuitionistic propositional logic   Medvedev degrees   Muchnik degrees   computability
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DOI 10.1305/ndjfl/1143468312
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Sori Lee & Jaap Van Oosten (2013). Basic Subtoposes of the Effective Topos. Annals of Pure and Applied Logic 164 (9):866-883.

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