Information om | Engelska ordet WFF

Exempel på hur man kan använda WFF i en mening

• In mathematical logic, propositional logic and predicate logic, a well-formed formula, abbreviated WFF or wff, often simply formula, is a finite sequence of symbols from a given alphabet that is part of a formal language.
• Then, such letters could be used to represent entire well-formed formulae (wff) of the predicate calculus: any free variable terms of the wff could be incorporated as terms of the Greek-letter predicate.
• For '~φ' (that is, the result of concatenating '~' and 'φ', in that order, from left to right) is not a well-formed formula (wff) of L, because no Greek letter can occur in well-formed formulas (wffs), according to the apparently intended meaning of the rules.
• Any line of any valid proof can be converted into a sequent by listing the wffs at the cited lines as the premises and the wff at the line as the conclusion.

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