Theorem pm11.07 2447

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 2446 as earlier thought. See https://groups.google.com/d/msg/metamath/iS0fOvSemC8/M1zTH8wxCAAJ. (Contributed by BJ, 16-Sep-2018.) (New usage is discouraged.)

Hypothesis

Ref	Expression
pm11.07.1	|- ph

Assertion

Ref	Expression
pm11.07	|- ph

Proof of Theorem pm11.07

Step	Hyp	Ref	Expression
1		pm11.07.1	1 |- ph

This theorem is referenced by: (None)