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Theorem prssi 3830
Description: A pair of elements of a class is a subset of the class. (Contributed by NM, 16-Jan-2015.)
Assertion
Ref Expression
prssi ((𝐴𝐶𝐵𝐶) → {𝐴, 𝐵} ⊆ 𝐶)

Proof of Theorem prssi
StepHypRef Expression
1 prssg 3829 . 2 ((𝐴𝐶𝐵𝐶) → ((𝐴𝐶𝐵𝐶) ↔ {𝐴, 𝐵} ⊆ 𝐶))
21ibi 176 1 ((𝐴𝐶𝐵𝐶) → {𝐴, 𝐵} ⊆ 𝐶)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104  wcel 2201  wss 3199  {cpr 3669
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-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-ext 2212
This theorem depends on definitions:  df-bi 117  df-tru 1400  df-nf 1509  df-sb 1810  df-clab 2217  df-cleq 2223  df-clel 2226  df-nfc 2362  df-v 2803  df-un 3203  df-in 3205  df-ss 3212  df-sn 3674  df-pr 3675
This theorem is referenced by:  prssd  3831  tpssi  3841  prelpwi  4305  onun2  4587  onintexmid  4670  nnregexmid  4718  rex2dom  6998  en2eqpr  7101  m1expcl2  10826  m1expcl  10827  minmax  11810  xrminmax  11845  1idssfct  12707  subrngin  14248  subrgin  14279  lssincl  14420  unopn  14755  umgrbien  15987  bdop  16528  012of  16650  isomninnlem  16696  trilpolemisumle  16704  trilpolemeq1  16706  trilpolemlt1  16707  iswomninnlem  16716  iswomni0  16718  ismkvnnlem  16719  nconstwlpolemgt0  16731
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