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Theorem prex 4112
Description: An unordered pair exists. (Contributed by SF, 12-Jan-2015.)
Assertion
Ref Expression
prex

Proof of Theorem prex
StepHypRef Expression
1 df-pr 3742 . 2
2 snex 4111 . . 3
3 snex 4111 . . 3
42, 3unex 4106 . 2
51, 4eqeltri 2423 1
Colors of variables: wff set class
Syntax hints:   wcel 1710  cvv 2859   cun 3207  csn 3737  cpr 3738
This theorem is referenced by:  opkex  4113  elopk  4129  opkthg  4131  enprmaplem5  6100  2p1e3c  6177  ce2  6213
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334  ax-nin 4078  ax-sn 4087
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-nan 1288  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2478  df-ne 2518  df-v 2861  df-nin 3211  df-compl 3212  df-in 3213  df-un 3214  df-dif 3215  df-ss 3259  df-nul 3551  df-sn 3741  df-pr 3742
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