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The expression "well-formed formulas" (WFF) also crept into popular culture. WFF is part of an esoteric pun used in the name of the academic game "WFF 'N PROOF: The Game of Modern Logic", by Layman Allen, [21] developed while he was at Yale Law School (he was later a professor at the University of Michigan).
As marketed in the 1960s WFF 'N PROOF was a series of 20 games of increasing complexity, varying with the logical rules and methods available. All players must be able to recognize a " well-formed formula " (WFF in Łukasiewicz notation ), to assemble dice values into valid statements (WFFs) and to apply the rules of logical inference so as to ...
Formal system. A formal system is an abstract structure and formalization of an axiomatic system used for deducing, using rules of inference, theorems from axioms by a set of inference rules. [1] In 1921, David Hilbert proposed to use formal systems as the foundation of knowledge in mathematics. [2]
Conjunctive normal form. In Boolean logic, a formula is in conjunctive normal form (CNF) or clausal normal form if it is a conjunction of one or more clauses, where a clause is a disjunction of literals; otherwise put, it is a product of sums or an AND of ORs. As a canonical normal form, it is useful in automated theorem proving and circuit theory.
Skolem normal form. In mathematical logic, a formula of first-order logic is in Skolem normal form if it is in prenex normal form with only universal first-order quantifiers. Every first-order formula may be converted into Skolem normal form while not changing its satisfiability via a process called Skolemization (sometimes spelled Skolemnization).
Metalogic. Metalogic is the metatheory of logic. Whereas logic studies how logical systems can be used to construct valid and sound arguments, metalogic studies the properties of logical systems. [1] Logic concerns the truths that may be derived using a logical system; metalogic concerns the truths that may be derived about the languages and ...
The World Forum of Fish Harvesters and Fishworkers (WFF) is an international non-governmental organization that works towards the establishment and upholding of fundamental human rights, social justice and culture of fish harvesters and fish workers, affirming the sea as the source of all life [citation needed] and committing themselves to sustain fisheries and aquatic resources from the ...
In mathematics and philosophy, Łukasiewicz logic (/ ˌ w ʊ k ə ˈ ʃ ɛ v ɪ tʃ / WUUK-ə-SHEV-itch, Polish: [wukaˈɕɛvitʂ]) is a non-classical, many-valued logic.It was originally defined in the early 20th century by Jan Łukasiewicz as a three-valued modal logic; [1] it was later generalized to n-valued (for all finite n) as well as infinitely-many-valued (ℵ 0-valued) variants, both ...