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Theorem syl6sseq 3046
Description: A chained subclass and equality deduction. (Contributed by NM, 25-Apr-2004.)
Hypotheses
Ref Expression
syl6sseq.1  |-  ( ph  ->  A  C_  B )
syl6sseq.2  |-  B  =  C
Assertion
Ref Expression
syl6sseq  |-  ( ph  ->  A  C_  C )

Proof of Theorem syl6sseq
StepHypRef Expression
1 syl6sseq.1 . 2  |-  ( ph  ->  A  C_  B )
2 syl6sseq.2 . . 3  |-  B  =  C
32sseq2i 3025 . 2  |-  ( A 
C_  B  <->  A  C_  C
)
41, 3sylib 120 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:  syl6sseqr  3047  onintonm  4269  relrelss  4874  iotanul  4912  foimacnv  5175  cauappcvgprlemladdru  6908
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