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April 1967 The deduction theorem in ${\rm S}4,$ ${\rm S}4.2$, and ${\rm S}5$.
J. Jay Zeman
Notre Dame J. Formal Logic 8(1-2): 56-60 (April 1967). DOI: 10.1305/ndjfl/1093956245
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Vol.8 • No. 1-2 • April 1967
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