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Theorem abid 239
Description: Proper substitution of a variable for itself.
Assertion
Ref Expression
abid (𝜑 ⧟ [xx] 𝜑)

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