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Syntax Definition wi 4
Description: If  ph and  ps are wff's, so is  (
ph  ->  ps ) or " ph implies  ps." Part of the recursive definition of a wff. The left-hand wff is called the antecedent, and the right-hand wff is called the consequent. In the case of  ( ph  ->  ( ps  ->  ch )
), the middle  ps may be informally called either an antecedent or part of the consequent depending on context.
Ref Expression
wph  wff  ph
wps  wff  ps
Ref Expression
wi  wff  ( ph  ->  ps )

This syntax is primitive. The first axiom using it is ax-1 5.

Colors of variables: wff set class
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