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Theorem pm11.07 2584
Description: Axiom *11.07 in [WhiteheadRussell] p. 159. The original reads: *11.07 "Whatever possible argument 𝑥 may be, 𝜑(𝑥, 𝑦) is true whatever possible argument 𝑦 may be" implies the corresponding statement with 𝑥 and 𝑦 interchanged except in "𝜑(𝑥, 𝑦)". Under our formalism this appears to correspond to idi 2 and not to sbcom4 2583 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 𝜑
Assertion
Ref Expression
pm11.07 𝜑

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