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Theorem eqidd 2354
Description: Class identity law with antecedent. (Contributed by NM, 21-Aug-2008.)
Assertion
Ref Expression
eqidd

Proof of Theorem eqidd
StepHypRef Expression
1 eqid 2353 . 2
21a1i 10 1
Colors of variables: wff setvar class
Syntax hints:   wi 4   wceq 1642
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1546  ax-ext 2334
This theorem depends on definitions:  df-bi 177  df-cleq 2346
This theorem is referenced by:  nfabd2  2507  cbvraldva  2841  cbvrexdva  2842  iotanul  4354  fvopab4t  5385  eqfnov2  5590  mpteq1  5658  cbvmpt2  5679  erthi  5970  spaccl  6286
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