Metamath Proof Explorer


Theorem rabidim1

Description: Membership in a restricted abstraction, implication. (Contributed by Glauco Siliprandi, 26-Jun-2021)

Ref Expression
Assertion rabidim1 x x A | φ x A

Proof

Step Hyp Ref Expression
1 rabid x x A | φ x A φ
2 1 simplbi x x A | φ x A