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Theorem sseq2d 3054
Description: An equality deduction for the subclass relationship. (Contributed by NM, 14-Aug-1994.)
Hypothesis
Ref Expression
sseq1d.1 (𝜑𝐴 = 𝐵)
Assertion
Ref Expression
sseq2d (𝜑 → (𝐶𝐴𝐶𝐵))

Proof of Theorem sseq2d
StepHypRef Expression
1 sseq1d.1 . 2 (𝜑𝐴 = 𝐵)
2 sseq2 3048 . 2 (𝐴 = 𝐵 → (𝐶𝐴𝐶𝐵))
31, 2syl 14 1 (𝜑 → (𝐶𝐴𝐶𝐵))
Colors of variables: wff set class
Syntax hints:  wi 4  wb 103   = wceq 1289  wss 2999
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 1381  ax-7 1382  ax-gen 1383  ax-ie1 1427  ax-ie2 1428  ax-8 1440  ax-11 1442  ax-4 1445  ax-17 1464  ax-i9 1468  ax-ial 1472  ax-i5r 1473  ax-ext 2070
This theorem depends on definitions:  df-bi 115  df-nf 1395  df-sb 1693  df-clab 2075  df-cleq 2081  df-clel 2084  df-in 3005  df-ss 3012
This theorem is referenced by:  sseq12d  3055  sseqtrd  3062  onsucsssucexmid  4341  sbcrel  4520  funimass2  5086  fnco  5116  fnssresb  5120  fnimaeq0  5129  foimacnv  5265  fvelimab  5354  ssimaexg  5360  fvmptss2  5373  rdgss  6140  isummolem2  10759  isummo  10760  zisum  10761  fsum3cvg3  10776
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