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Theorem sbequ12a 1653
Description: An equality theorem for substitution. (Contributed by NM, 5-Aug-1993.)
Assertion
Ref Expression
sbequ12a

Proof of Theorem sbequ12a
StepHypRef Expression
1 sbequ12 1651 . 2
2 sbequ12 1651 . . 3
32equcoms 1591 . 2
41, 3bitr3d 179 1
Colors of variables: wff set class
Syntax hints:   wi 4   wb 98  wsb 1642
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-gen 1335  ax-ie1 1379  ax-ie2 1380  ax-8 1392  ax-4 1397  ax-17 1416  ax-i9 1420
This theorem depends on definitions:  df-bi 110  df-sb 1643
This theorem is referenced by: (None)
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