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Theorem sseq1d 3277
Description: An equality deduction for the subclass relationship. (Contributed by NM, 14-Aug-1994.)
Hypothesis
Ref Expression
sseq1d.1  |-  ( ph  ->  A  =  B )
Assertion
Ref Expression
sseq1d  |-  ( ph  ->  ( A  C_  C  <->  B 
C_  C ) )

Proof of Theorem sseq1d
StepHypRef Expression
1 sseq1d.1 . 2  |-  ( ph  ->  A  =  B )
2 sseq1 3271 . 2  |-  ( A  =  B  ->  ( A  C_  C  <->  B  C_  C
) )
31, 2syl 14 1  |-  ( ph  ->  ( A  C_  C  <->  B 
C_  C ) )
Colors of variables:    wff set class
This proof depends on syntax axioms:    -> wi 4    <-> wb 105    = wceq 1402    C_ wss 3220
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-11 1559  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220
This proof depends on definitions:  df-bi 117  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-in 3226  df-ss 3233
This theorem is used by:  sseq12d  3279  eqsstrd  3284  snssgOLD  3851  ssiun2s  4056  treq  4235  onsucsssucexmid  4674  funimass1  5458  feq1  5516  sbcfg  5532  fvmptssdm  5790  fvimacnvi  5823  nnsucsssuc  6765  ereq1  6814  elpm2r  6940  fipwssg  7313  nnnninf  7466  ctssexmid  7490  rspssp  14880  iscnp  15349  iscnp4  15368  cnntr  15375  cnconst2  15383  cnptopresti  15388  cnptoprest  15389  txbas  15408  txcnp  15421  txdis  15427  txdis1cn  15428  blssps  15577  blss  15578  ssblex  15581  blin2  15582  metss2  15648  metrest  15656  metcnp3  15661  cnopnap  15761  limccl  15809  ellimc3apf  15810  ausgrumgrien  16509  ausgrusgrien  16510  eupth2lem3lem4fi  16812
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