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Theorem prex 4113
Description: An unordered pair exists. (Contributed by SF, 12-Jan-2015.)
Assertion
Ref Expression
prex {A, B} V

Proof of Theorem prex
StepHypRef Expression
1 df-pr 3743 . 2 {A, B} = ({A} ∪ {B})
2 snex 4112 . . 3 {A} V
3 snex 4112 . . 3 {B} V
42, 3unex 4107 . 2 ({A} ∪ {B}) V
51, 4eqeltri 2423 1 {A, B} V
Colors of variables: wff setvar class
Syntax hints:   wcel 1710  Vcvv 2860  cun 3208  {csn 3738  {cpr 3739
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 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 4079  ax-sn 4088
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 2479  df-ne 2519  df-v 2862  df-nin 3212  df-compl 3213  df-in 3214  df-un 3215  df-dif 3216  df-ss 3260  df-nul 3552  df-sn 3742  df-pr 3743
This theorem is referenced by:  opkex  4114  elopk  4130  opkthg  4132  enprmaplem5  6081  2p1e3c  6157  ce2  6193
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