Abstract
A logical space is a pair \({(A, {\mathcal{B}})}\) of a non-empty set A and a subset \({{\mathcal{B}}}\) of \({{\mathcal{P}} A}\) . Since \({{\mathcal{P}} A}\) is identified with {0, 1}A and {0, 1} is a typical lattice, a pair \({(A, {\mathcal{F}})}\) of a non-empty set A and a subset \({{\mathcal{F}}}\) of \({{\mathbb{B}}^A}\) for a certain lattice \({{\mathbb{B}}}\) is also called a \({{\mathbb{B}}}\) -valued functional logical space. A deduction system on A is a pair (R, D) of a subset D of A and a relation R between A* and A. In terms of these simplest concepts, a general framework for studying the logical completeness is constructed.
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Gomi, K. Theory of Completeness for Logical Spaces. Log. Univers. 3, 243–291 (2009). https://doi.org/10.1007/s11787-009-0008-z
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DOI: https://doi.org/10.1007/s11787-009-0008-z