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Theorem sbidd 28523
Description: An identity theorem for substitution. See sbid 1948. See Remark 9.1 in [Megill] p. 447 (p. 15 of the preprint). (Contributed by DAW, 18-Feb-2017.)
Hypothesis
Ref Expression
sbidd.1  |-  ( ph  ->  [ x  /  x ] ps )
Assertion
Ref Expression
sbidd  |-  ( ph  ->  ps )

Proof of Theorem sbidd
StepHypRef Expression
1 sbidd.1 . 2  |-  ( ph  ->  [ x  /  x ] ps )
2 sbid 1948 . 2  |-  ( [ x  /  x ] ps 
<->  ps )
31, 2sylib 190 1  |-  ( ph  ->  ps )
Colors of variables: wff set class
Syntax hints:    -> wi 4   [wsb 1659
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1556  ax-5 1567  ax-17 1627  ax-9 1667  ax-8 1688  ax-11 1762
This theorem depends on definitions:  df-bi 179  df-an 362  df-ex 1552  df-sb 1660
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