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Theorem dfpr2 3383
 Description: Alternate definition of unordered pair. Definition 5.1 of [TakeutiZaring] p. 15. (Contributed by NM, 24-Apr-1994.)
Assertion
Ref Expression
dfpr2
Distinct variable groups:   ,   ,

Proof of Theorem dfpr2
StepHypRef Expression
1 df-pr 3374 . 2
2 elun 3078 . . . 4
3 elsn 3382 . . . . 5
4 elsn 3382 . . . . 5
53, 4orbi12i 680 . . . 4
62, 5bitri 173 . . 3
76abbi2i 2149 . 2
81, 7eqtri 2057 1
 Colors of variables: wff set class Syntax hints:   wo 628   wceq 1242   wcel 1390  cab 2023   cun 2909  csn 3367  cpr 3368 This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 629  ax-5 1333  ax-7 1334  ax-gen 1335  ax-ie1 1379  ax-ie2 1380  ax-8 1392  ax-10 1393  ax-11 1394  ax-i12 1395  ax-bndl 1396  ax-4 1397  ax-17 1416  ax-i9 1420  ax-ial 1424  ax-i5r 1425  ax-ext 2019 This theorem depends on definitions:  df-bi 110  df-tru 1245  df-nf 1347  df-sb 1643  df-clab 2024  df-cleq 2030  df-clel 2033  df-nfc 2164  df-v 2553  df-un 2916  df-sn 3373  df-pr 3374 This theorem is referenced by:  elprg  3384  nfpr  3411  pwsnss  3565
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