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Theorem opswap 5660
 Description: Swap the members of an ordered pair. (Contributed by NM, 14-Dec-2008.) (Revised by Mario Carneiro, 30-Aug-2015.)
Assertion
Ref Expression
opswap {⟨𝐴, 𝐵⟩} = ⟨𝐵, 𝐴

Proof of Theorem opswap
StepHypRef Expression
1 cnvsng 5652 . . . 4 ((𝐴 ∈ V ∧ 𝐵 ∈ V) → {⟨𝐴, 𝐵⟩} = {⟨𝐵, 𝐴⟩})
21unieqd 4478 . . 3 ((𝐴 ∈ V ∧ 𝐵 ∈ V) → {⟨𝐴, 𝐵⟩} = {⟨𝐵, 𝐴⟩})
3 opex 4962 . . . 4 𝐵, 𝐴⟩ ∈ V
43unisn 4483 . . 3 {⟨𝐵, 𝐴⟩} = ⟨𝐵, 𝐴
52, 4syl6eq 2701 . 2 ((𝐴 ∈ V ∧ 𝐵 ∈ V) → {⟨𝐴, 𝐵⟩} = ⟨𝐵, 𝐴⟩)
6 uni0 4497 . . 3 ∅ = ∅
7 opprc 4456 . . . . . . 7 (¬ (𝐴 ∈ V ∧ 𝐵 ∈ V) → ⟨𝐴, 𝐵⟩ = ∅)
87sneqd 4222 . . . . . 6 (¬ (𝐴 ∈ V ∧ 𝐵 ∈ V) → {⟨𝐴, 𝐵⟩} = {∅})
98cnveqd 5330 . . . . 5 (¬ (𝐴 ∈ V ∧ 𝐵 ∈ V) → {⟨𝐴, 𝐵⟩} = {∅})
10 cnvsn0 5638 . . . . 5 {∅} = ∅
119, 10syl6eq 2701 . . . 4 (¬ (𝐴 ∈ V ∧ 𝐵 ∈ V) → {⟨𝐴, 𝐵⟩} = ∅)
1211unieqd 4478 . . 3 (¬ (𝐴 ∈ V ∧ 𝐵 ∈ V) → {⟨𝐴, 𝐵⟩} = ∅)
13 ancom 465 . . . 4 ((𝐴 ∈ V ∧ 𝐵 ∈ V) ↔ (𝐵 ∈ V ∧ 𝐴 ∈ V))
14 opprc 4456 . . . 4 (¬ (𝐵 ∈ V ∧ 𝐴 ∈ V) → ⟨𝐵, 𝐴⟩ = ∅)
1513, 14sylnbi 319 . . 3 (¬ (𝐴 ∈ V ∧ 𝐵 ∈ V) → ⟨𝐵, 𝐴⟩ = ∅)
166, 12, 153eqtr4a 2711 . 2 (¬ (𝐴 ∈ V ∧ 𝐵 ∈ V) → {⟨𝐴, 𝐵⟩} = ⟨𝐵, 𝐴⟩)
175, 16pm2.61i 176 1 {⟨𝐴, 𝐵⟩} = ⟨𝐵, 𝐴
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   ∧ wa 383   = wceq 1523   ∈ wcel 2030  Vcvv 3231  ∅c0 3948  {csn 4210  ⟨cop 4216  ∪ cuni 4468  ◡ccnv 5142 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-sep 4814  ax-nul 4822  ax-pr 4936 This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ne 2824  df-ral 2946  df-rex 2947  df-rab 2950  df-v 3233  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-nul 3949  df-if 4120  df-sn 4211  df-pr 4213  df-op 4217  df-uni 4469  df-br 4686  df-opab 4746  df-xp 5149  df-rel 5150  df-cnv 5151  df-dm 5153  df-rn 5154 This theorem is referenced by:  2nd1st  7257  cnvf1olem  7320  brtpos  7406  dftpos4  7416  tpostpos  7417  xpcomco  8091  fsumcnv  14548  fprodcnv  14757  gsumcom2  18420  txswaphmeolem  21655
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