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April 1972 The relative consistency of the class axioms of abstraction and extensionality and the axioms of NBG in a three-valued logic.
Ross T. Brady
Notre Dame J. Formal Logic 13(2): 161-176 (April 1972). DOI: 10.1305/ndjfl/1093894712
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Vol.13 • No. 2 • April 1972
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