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Theorem pm11.07 2286
Description: Axiom *11.07 in [WhiteheadRussell] p. 159. The original reads: *11.07 "Whatever possible argument  x may be,  ph ( x ,  y ) is true whatever possible argument  y may be" implies the corresponding statement with  x and  y interchanged except in " ph ( x ,  y )". Under our formalism this appears to correspond to idi 2 and not to sbcom4 2285 as earlier thought. See (Contributed by BJ, 16-Sep-2018.) (New usage is discouraged.)
Ref Expression
pm11.07.1  |-  ph
Ref Expression
pm11.07  |-  ph

Proof of Theorem pm11.07
StepHypRef Expression
1 pm11.07.1 1  |-  ph
Colors of variables: wff setvar class
This theorem is referenced by: (None)
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