"Implies" is the connective in propositional calculus which has the meaning "if is true, then is also true." In formal terminology, the term conditional is often used to refer to this connective (Mendelson 1997, p. 13). The symbol used to denote "implies" is , (Carnap 1958, p. 8; Mendelson 1997, p. 13), or .
In classical logic, is an abbreviation for , where denotes NOT and denotes OR (though this is not the case, for example, in intuitionistic logic). is a binary operator that is implemented in the Wolfram Language as Implies[A, B], and can not be extended to more than two arguments.
has the following truth table (Carnap 1958, p. 10; Mendelson 1997, p. 13).
If and (i.e., ), then and are said to be equivalent, a relationship which is written symbolically as , , or (Carnap 1958, p. 8).