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Theorem sseqtrd 3045
 Description: Substitution of equality into a subclass relationship. (Contributed by NM, 25-Apr-2004.)
Hypotheses
Ref Expression
sseqtrd.1
sseqtrd.2
Assertion
Ref Expression
sseqtrd

Proof of Theorem sseqtrd
StepHypRef Expression
1 sseqtrd.1 . 2
2 sseqtrd.2 . . 3
32sseq2d 3037 . 2
41, 3mpbid 145 1
 Colors of variables: wff set class Syntax hints:   wi 4   wceq 1285   wss 2983 This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-5 1377  ax-7 1378  ax-gen 1379  ax-ie1 1423  ax-ie2 1424  ax-8 1436  ax-11 1438  ax-4 1441  ax-17 1460  ax-i9 1464  ax-ial 1468  ax-i5r 1469  ax-ext 2065 This theorem depends on definitions:  df-bi 115  df-nf 1391  df-sb 1688  df-clab 2070  df-cleq 2076  df-clel 2079  df-in 2989  df-ss 2996 This theorem is referenced by:  sseqtr4d  3046  resasplitss  5121  nnaword2  6175  erssxp  6217  phpm  6422  ioodisj  9127
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