Theorem cnvsn 5074

Description: Converse of a singleton of an ordered pair. (Contributed by NM, 11-May-1998.)

Hypotheses

Ref	Expression
cnvsn.1	⊢ A ∈ V
cnvsn.2	⊢ B ∈ V

Assertion

Ref	Expression
cnvsn	⊢ ◡{⟨A, B⟩} = {⟨B, A⟩}

Proof of Theorem cnvsn

Dummy variables x y are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		vex 2863	. . . . . 6 ⊢ y ∈ V
2		vex 2863	. . . . . 6 ⊢ x ∈ V
3	1, 2	opex 4589	. . . . 5 ⊢ ⟨y, x⟩ ∈ V
4	3	elsnc 3757	. . . 4 ⊢ (⟨y, x⟩ ∈ {⟨A, B⟩} ↔ ⟨y, x⟩ = ⟨A, B⟩)
5		ancom 437	. . . . 5 ⊢ ((y = A ∧ x = B) ↔ (x = B ∧ y = A))
6		opth 4603	. . . . 5 ⊢ (⟨y, x⟩ = ⟨A, B⟩ ↔ (y = A ∧ x = B))
7		opth 4603	. . . . 5 ⊢ (⟨x, y⟩ = ⟨B, A⟩ ↔ (x = B ∧ y = A))
8	5, 6, 7	3bitr4i 268	. . . 4 ⊢ (⟨y, x⟩ = ⟨A, B⟩ ↔ ⟨x, y⟩ = ⟨B, A⟩)
9	4, 8	bitri 240	. . 3 ⊢ (⟨y, x⟩ ∈ {⟨A, B⟩} ↔ ⟨x, y⟩ = ⟨B, A⟩)
10		opelcnv 4894	. . 3 ⊢ (⟨x, y⟩ ∈ ◡{⟨A, B⟩} ↔ ⟨y, x⟩ ∈ {⟨A, B⟩})
11	2, 1	opex 4589	. . . 4 ⊢ ⟨x, y⟩ ∈ V
12	11	elsnc 3757	. . 3 ⊢ (⟨x, y⟩ ∈ {⟨B, A⟩} ↔ ⟨x, y⟩ = ⟨B, A⟩)
13	9, 10, 12	3bitr4i 268	. 2 ⊢ (⟨x, y⟩ ∈ ◡{⟨A, B⟩} ↔ ⟨x, y⟩ ∈ {⟨B, A⟩})
14	13	eqrelriv 4851	1 ⊢ ◡{⟨A, B⟩} = {⟨B, A⟩}

Syntax hints:   ∧ wa 358   = wceq 1642   ∈ wcel 1710  Vcvv 2860  {csn 3738  ⟨cop 4562  ^◡ccnv 4772

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-13 1712  ax-14 1714  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334  ax-nin 4079  ax-xp 4080  ax-cnv 4081  ax-1c 4082  ax-sset 4083  ax-si 4084  ax-ins2 4085  ax-ins3 4086  ax-typlower 4087  ax-sn 4088

This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3or 935  df-3an 936  df-nan 1288  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-eu 2208  df-mo 2209  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2479  df-ne 2519  df-ral 2620  df-rex 2621  df-reu 2622  df-rmo 2623  df-rab 2624  df-v 2862  df-sbc 3048  df-nin 3212  df-compl 3213  df-in 3214  df-un 3215  df-dif 3216  df-symdif 3217  df-ss 3260  df-pss 3262  df-nul 3552  df-if 3664  df-pw 3725  df-sn 3742  df-pr 3743  df-uni 3893  df-int 3928  df-opk 4059  df-1c 4137  df-pw1 4138  df-uni1 4139  df-xpk 4186  df-cnvk 4187  df-ins2k 4188  df-ins3k 4189  df-imak 4190  df-cok 4191  df-p6 4192  df-sik 4193  df-ssetk 4194  df-imagek 4195  df-idk 4196  df-iota 4340  df-0c 4378  df-addc 4379  df-nnc 4380  df-fin 4381  df-lefin 4441  df-ltfin 4442  df-ncfin 4443  df-tfin 4444  df-evenfin 4445  df-oddfin 4446  df-sfin 4447  df-spfin 4448  df-phi 4566  df-op 4567  df-proj1 4568  df-proj2 4569  df-opab 4624  df-br 4641  df-cnv 4786

This theorem is referenced by:  opswap  5075  f1osn  5323