Well-formed Formula

In mathematical logic, a well-formed formula, shortly wff, often simply formula, is a word (i.e. a finite sequence of symbols from a given alphabet) which is part of a formal language. A formal language can be considered to be identical to the set containing all and only its formulas.

A formula is a syntactic formal object that can be informally given a semantic meaning.

Read more about Well-formed Formula:  Introduction, Propositional Calculus, Predicate Logic, Atomic and Open Formulas, Closed Formulas, Properties Applicable To Formulas, Usage of The Terminology

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