Description: Rule of Modus Ponens.
The postulated inference rule of propositional
calculus. See e.g. Rule 1 of [Hamilton] p. 73. The rule says, "if
is true,
and implies
, then must also be
true." This rule is sometimes called "detachment," since
it detaches
the minor premise from the major premise.
Note: In some web page displays such as the Statement List, the symbols
"&" and "=>" informally indicate the relationship
between the hypotheses
and the assertion (conclusion), abbreviating the English words
"and" and
"implies." They are not part of the formal language.
(Contributed by
NM, 5-Aug-1993.) |