Metamath Proof Explorer


Theorem wl-impchain-a1-1

Description: Inference rule, a copy of a1i . Head start of a recursive proof pattern. (Contributed by Wolf Lammen, 20-Jun-2020) (New usage is discouraged.) (Proof modification is discouraged.)

Ref Expression
Hypothesis wl-impchain-a1-1.a φ
Assertion wl-impchain-a1-1 ψ φ

Proof

Step Hyp Ref Expression
1 wl-impchain-a1-1.a φ
2 1 wl-luk-a1i ψ φ