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Theorem dfsub1 264
Description: Restatement of dfsub 233 with nilad equality.
Assertion
Ref Expression
dfsub1 ([xY] 𝜑 ⧟ ∇x(x = Y𝜑))

Proof of Theorem dfsub1
StepHypRef Expression
Colors of variables: wff var nilad
Syntax hints:  wlb 55  wli 61  nvar 203  [wsub 207  wnnu 242   = weq 246
 WARNING: This theorem has an incomplete proof.
This theorem is referenced by: (None)
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