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Theorem bj-a1k 31569
Description: Weakening of ax-1 6. This shortens the proofs of dfwe2 6747, ordunisuc2 6810, r111 8395, smo11 7222. (Contributed by BJ, 11-Aug-2020.)
Assertion
Ref Expression
bj-a1k (𝜑 → (𝜓 → (𝜒𝜓)))

Proof of Theorem bj-a1k
StepHypRef Expression
1 ax-1 6 . 2 (𝜓 → (𝜒𝜓))
21a1i 11 1 (𝜑 → (𝜓 → (𝜒𝜓)))
Colors of variables: wff setvar class
Syntax hints:  wi 4
This theorem was proved from axioms:  ax-mp 5  ax-1 6
This theorem is referenced by: (None)
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