In logic, WFF is an abbreviation for well-formed formula. That is, given a formal grammar to produce strings, the assertion 'string S is a WFF' only means that it really is produced by the grammar.
For example, in propositional calculus the sequence of symbols is a WFF because it is grammatically correct (in fact, it is a tautology). The sequence of symbols is not a WFF, because it does not conform to the grammar of propositional calculus.
Informally, WFFs are the sequences of symbols which have meaning in a given logical system.
In mathematics, a WFF is often the basis of a proof, which leads to one of the most notoriously esoteric puns ever used in the name of a product: "WFF 'n Proof: The Game of Modern Logic," by Layman Allen, a professor at the University of Michigan. The board game is designed to teach the principles of symbolic logic to children (in Polish notation), and its name is a pun on whiffenpoof, a nonsense word used as a cheer at Yale University made popular in The Whiffenpoof Song.
Incidentally, "Why is not a WFF." is the correct answer to the often talked about Philosophy exam question "Why?" (as opposed to "Why not?").
A formula is a sentential expression in a formal language.
Because it includes negated formulas, the class of literals is a superset of the class of atomic formulas.
In Cyc-10, formulas that are asserted into the KB are converted into conjunctive normal form; the formula of each single assertion is internally represented as a disjunction of literals.
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The goal of Vaxa Kidney Formula is to maintain health in the urinary system, nourish the tissues and help the normal functioning of the various organs and tissues involved.
The balance of the formula is composed of zinc, selenium, silicon, tin, molybdenum, lithium and vanadium, which are minerals and trace elements necessary for the good functioning of important metabolic reactions in the kidneys.
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