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Theorem eqimss2 3303
Description: Equality implies the subclass relation. (Contributed by NM, 23-Nov-2003.)
Assertion
Ref Expression
eqimss2  |-  ( B  =  A  ->  A  C_  B )

Proof of Theorem eqimss2
StepHypRef Expression
1 eqimss 3302 . 2  |-  ( A  =  B  ->  A  C_  B )
21eqcoms 2241 1  |-  ( B  =  A  ->  A  C_  B )
Colors of variables:    wff set class
This proof depends on syntax axioms:    -> wi 4    = 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:  ifpprsnssdc  3820  disjeq2  4110  disjeq1  4113  poeq2  4445  seeq1  4484  seeq2  4485  dmcoeq  5055  xp11m  5226  funeq  5397  fconst3m  5934  tposeq  6518  mapssfsetg  6946  undifdcss  7230  nninfctlemfo  12833  ennnfonelemk  13340  ennnfonelemss  13350  qnnen  13371  imasaddfnlemg  13684  topgele  15179  topontopn  15187  txdis  15427  edgstruct  16403
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