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Theorem wl-impchain-a1-1 33603
Description: Inference rule, a copy of a1i 11. Head start of a recursive proof pattern. (Contributed by Wolf Lammen, 20-Jun-2020.) (New usage is discouraged.) (Proof modification is discouraged.)
Ref Expression
wl-impchain-a1-1.a 𝜑
Ref Expression
wl-impchain-a1-1 (𝜓𝜑)

Proof of Theorem wl-impchain-a1-1
StepHypRef Expression
1 wl-impchain-a1-1.a . 2 𝜑
21wl-a1i 33571 1 (𝜓𝜑)
Colors of variables: wff setvar class
Syntax hints:  wi 4
This theorem was proved from axioms:  ax-mp 5  ax-luk1 33561  ax-luk2 33562  ax-luk3 33563
This theorem is referenced by:  wl-impchain-a1-2  33604
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