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Theorem prssi 3595
Description: A pair of elements of a class is a subset of the class. (Contributed by NM, 16-Jan-2015.)
Assertion
Ref Expression
prssi  |-  ( ( A  e.  C  /\  B  e.  C )  ->  { A ,  B }  C_  C )

Proof of Theorem prssi
StepHypRef Expression
1 prssg 3594 . 2  |-  ( ( A  e.  C  /\  B  e.  C )  ->  ( ( A  e.  C  /\  B  e.  C )  <->  { A ,  B }  C_  C
) )
21ibi 174 1  |-  ( ( A  e.  C  /\  B  e.  C )  ->  { A ,  B }  C_  C )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 102    e. wcel 1438    C_ wss 2999   {cpr 3447
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-io 665  ax-5 1381  ax-7 1382  ax-gen 1383  ax-ie1 1427  ax-ie2 1428  ax-8 1440  ax-10 1441  ax-11 1442  ax-i12 1443  ax-bndl 1444  ax-4 1445  ax-17 1464  ax-i9 1468  ax-ial 1472  ax-i5r 1473  ax-ext 2070
This theorem depends on definitions:  df-bi 115  df-tru 1292  df-nf 1395  df-sb 1693  df-clab 2075  df-cleq 2081  df-clel 2084  df-nfc 2217  df-v 2621  df-un 3003  df-in 3005  df-ss 3012  df-sn 3452  df-pr 3453
This theorem is referenced by:  tpssi  3603  prelpwi  4041  onun2  4307  onintexmid  4388  nnregexmid  4434  en2eqpr  6621  m1expcl2  9973  m1expcl  9974  minmax  10657  1idssfct  11371  unopn  11557  bdop  11721
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