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Theorem ssel2 3223
Description: Membership relationships follow from a subclass relationship. (Contributed by NM, 7-Jun-2004.)
Assertion
Ref Expression
ssel2  |-  ( ( A  C_  B  /\  C  e.  A )  ->  C  e.  B )

Proof of Theorem ssel2
StepHypRef Expression
1 ssel 3222 . 2  |-  ( A 
C_  B  ->  ( C  e.  A  ->  C  e.  B ) )
21imp 124 1  |-  ( ( A  C_  B  /\  C  e.  A )  ->  C  e.  B )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    e. wcel 2202    C_ wss 3201
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-11 1555  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-ext 2213
This theorem depends on definitions:  df-bi 117  df-nf 1510  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-in 3207  df-ss 3214
This theorem is referenced by:  elnn  4710  funimass4  5705  fvelimab  5711  ssimaex  5716  funconstss  5774  rexima  5905  ralima  5906  1st2nd  6353  f1o2ndf1  6402  tfri1dALT  6560  eldju1st  7330  axsuploc  8311  lbinf  9187  dfinfre  9195  lbzbi  9911  elfzom1elp1fzo  10510  ssfzo12  10532  seq3split  10813  seqsplitg  10814  shftlem  11456  uzwodc  12688  subgintm  13865  subrngintm  14307  subrgintm  14338  tgcl  14875  neipsm  14965  txbasval  15078  elmopn2  15260  metrest  15317  cncfmet  15403  negcncf  15416  ply1term  15554  plyconst  15556  reeff1olem  15582  usgruspgrben  16127
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