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Theorem abre2 238
Description: Proper substitution into the right side of (which is free of that variable).
Assertion
Ref Expression
abre2 ([xy] νa𝜑 ⧟ [ay] [xy] νa𝜑)
Distinct variable groups:   a,x   a,y

Proof of Theorem abre2
StepHypRef Expression
Colors of variables: wff var nilad
Syntax hints:  wlb 55  nvar 203  [wre 205  νwnu 206  [wsub 207
 WARNING: This theorem has an incomplete proof.
This theorem is referenced by: (None)
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