Three-Valued Logic
Putnam (Hilary)
Source: Putnam - Philosophical Papers 1 - Mathematics, Matter and Method
Paper - Abstract

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    The article goes into various objections to a logic which employs the notion of a 'middle' truth-value, paying special attention to whether such a notion makes sense and whether such a three-valued logic has a use. In support of the latter point the author refers to the work of reichenbach who demonstrates that adopting a three-valued logic permits one to preserve both the laws of quantum mechanics1 and the principle that no causal signal travels with infinite speed--a condition not possible if ordinary two-valued logic is used. (Staff)

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