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Theorem bj-0 31537
Description: A syntactic theorem. See the section comment and the comment of bj-1 31538. The full proof (that is, with the syntactic, non-essential steps) does not appear on this webpage. It has five steps and reads $= wph wps wi wch wi $. The only other syntactic theorems in the main part of are wel 1939 and weq 1824. (Contributed by BJ, 24-Sep-2019.) (Proof modification is discouraged.) (New usage is discouraged.)
Ref Expression
bj-0 wff ((𝜑𝜓) → 𝜒)

Proof of Theorem bj-0
StepHypRef Expression
1 wi 4 1 wff ((𝜑𝜓) → 𝜒)
Colors of variables: wff setvar class
Syntax hints:  wi 4
This theorem is referenced by:  bj-1  31538
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