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Theorem syl6eqss 3050
Description: A chained subclass and equality deduction. (Contributed by Mario Carneiro, 2-Jan-2017.)
Hypotheses
Ref Expression
syl6eqss.1  |-  ( ph  ->  A  =  B )
syl6eqss.2  |-  B  C_  C
Assertion
Ref Expression
syl6eqss  |-  ( ph  ->  A  C_  C )

Proof of Theorem syl6eqss
StepHypRef Expression
1 syl6eqss.1 . 2  |-  ( ph  ->  A  =  B )
2 syl6eqss.2 . . 3  |-  B  C_  C
32a1i 9 . 2  |-  ( ph  ->  B  C_  C )
41, 3eqsstrd 3034 1  |-  ( ph  ->  A  C_  C )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1285    C_ wss 2974
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 2064
This theorem depends on definitions:  df-bi 115  df-nf 1391  df-sb 1687  df-clab 2069  df-cleq 2075  df-clel 2078  df-in 2980  df-ss 2987
This theorem is referenced by:  syl6eqssr  3051  resasplitss  5100  fimacnv  5328  en2other2  6522  bj-nntrans  10904
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