Variable declarations in natural deduction

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Variable declarations in natural deduction

We propose the use of variable declarations in natural deduction. A variable declaration is a line in a derivation that introduces a new variable into the derivation. Semantically, it can be regarded as declaring that the variable denotes an element of the universe of discourse. Undeclared variables, in contrast, do not denote anything, and may not occur free in any formula in the derivation. A...

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ژورنال

عنوان ژورنال: Annals of Pure and Applied Logic

سال: 2006

ISSN: 0168-0072

DOI: 10.1016/j.apal.2006.05.009