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Noun
1. truth-function
Wikipedia definition
2. Truth functionIn mathematical logic, a truth function is a function from a set of truth values to truth values. Classically the domain and range of a truth function are {truth, falsehood}, but they may have any number of truth values, including an infinity of these. A sentence is truth-functional if the truth-value of the sentence is a function of the truth-value of its sub-sentences. A class of sentences is truth-functional if each of its members is.
Read “Truth function” on English Wikipedia
Read “真理関数” on Japanese Wikipedia
Read “Truth function” on DBpedia

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