Intuitionistic Logic Explorer < Previous   Next > Nearby theorems Mirrors  >  Home  >  ILE Home  >  Th. List  >  ax-mp GIF version

Axiom ax-mp 5
 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 𝜑 is true, and 𝜑 implies 𝜓, then 𝜓 must also be true." This rule is sometimes called "detachment", since it detaches the minor premise from the major premise. "Modus ponens" is short for "modus ponendo ponens", a Latin phrase that means "the mode that by affirming affirms" - remark in [Sanford] p. 39. This rule is similar to the rule of modus tollens mto 651. 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, 30-Sep-1992.)
Hypotheses
Ref Expression
min 𝜑
maj (𝜑𝜓)
Assertion
Ref Expression
ax-mp 𝜓

Detailed syntax breakdown of Axiom ax-mp
StepHypRef Expression
1 wps 1 wff 𝜓