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rule of replacement
In logic, a rule of replacement〔Moore and Parker〕 is a transformation rule that may be applied to only a particular segment of an expression. A logical system may be constructed so that it uses either axioms, rules of inference, or both as transformation rules for logical expressions in the system. Whereas a rule of inference is always applied to a whole logical expression, a rule of replacement may be applied to only a particular segment. Within the context of a logical proof, logically equivalent expressions may replace each other. Rules of replacement are used in propositional logic to manipulate propositions.
Common rules of replacement include de Morgan's laws, commutation, association, distribution, double negation,〔not admitted in intuitionistic logic〕 transposition, material implication, material equivalence, exportation, and tautology.
==References==
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