propositional function


propositional function

noun

Definition of PROPOSITIONAL FUNCTION

2
:  something that is designated or expressed by a sentential function

First Known Use of PROPOSITIONAL FUNCTION

1903

propositional function

noun    (Concise Encyclopedia)

Sentencelike expression that may be thought of as obtained from a sentence by substituting variables for constants occurring in the sentence. For example, “x was a parent of y” may be thought of as obtained from “Adam was a parent of Abel.” A propositional function therefore has no truth-value, becoming true or false only when its free variables are replaced by constants of appropriate syntactic categories (e.g., “Abraham was a parent of Isaac”).

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