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A '''boolean-valued function''' is a [[function (mathematics)|function]] of the type ''f'' : ''X'' → '''B''', where ''X'' is an arbitrary [[set]] and where '''B''' is a [[boolean domain]].

A '''boolean-valued function''' is a [[function (mathematics)|function]] of the type <math>f : X \to \mathbb{B},</math> where <math>X\!</math> is an arbitrary [[set]] and where <math>\mathbb{B}</math> is a [[boolean domain]].

In the [[formal science]]s — [[mathematics]], [[mathematical logic]], [[statistics]] — and their applied disciplines, a boolean-valued function may also be referred to as a [[characteristic function]], [[indicator function]], [[predicate]], or [[proposition]].  In all of these uses it is understood that the various terms refer to a mathematical object and not the corresponding [[semiotic]] sign or syntactic expression.

In the [[formal science]]s &mdash; [[mathematics]], [[mathematical logic]], [[statistics]] &mdash; and their applied disciplines, a boolean-valued function may also be referred to as a [[characteristic function]], [[indicator function]], [[predicate]], or [[proposition]].  In all of these uses it is understood that the various terms refer to a mathematical object and not the corresponding [[semiotic]] sign or syntactic expression.

In [[semantics|formal semantic]] theories of [[truth]], a '''truth predicate''' is a predicate on the [[sentence]]s of a [[formal language]], interpreted for logic, that formalizes the intuitive concept that is normally expressed by saying that a sentence is true.  A truth predicate may have additional domains beyond the formal language domain, if that is what is required to determine a final truth value.

In [[semantics|formal semantic]] theories of [[truth]], a '''truth predicate''' is a predicate on the [[sentence]]s of a [[formal language]], interpreted for logic, that formalizes the intuitive concept that is normally expressed by saying that a sentence is true.  A truth predicate may have additional domains beyond the formal language domain, if that is what is required to determine a final truth value.