Theorem coss1cnvres 37225

Description: Class of cosets by the converse of a restriction. (Contributed by Peter Mazsa, 8-Jun-2020.)

Assertion

Ref	Expression
coss1cnvres	⊢ ≀ ◡(𝑅 ↾ 𝐴) = {⟨𝑢, 𝑣⟩ ∣ ((𝑢 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ ∃𝑥(𝑢𝑅𝑥 ∧ 𝑣𝑅𝑥))}

Distinct variable groups:   𝑢,𝐴,𝑣,𝑥   𝑢,𝑅,𝑣,𝑥

Proof of Theorem coss1cnvres

Step	Hyp	Ref	Expression
1		df-coss 37219	. 2 ⊢ ≀ ◡(𝑅 ↾ 𝐴) = {⟨𝑢, 𝑣⟩ ∣ ∃𝑥(𝑥◡(𝑅 ↾ 𝐴)𝑢 ∧ 𝑥◡(𝑅 ↾ 𝐴)𝑣)}
2		br1cnvres 37075	. . . . . . . 8 ⊢ (𝑥 ∈ V → (𝑥◡(𝑅 ↾ 𝐴)𝑢 ↔ (𝑢 ∈ 𝐴 ∧ 𝑢𝑅𝑥)))
3	2	elv 3481	. . . . . . 7 ⊢ (𝑥◡(𝑅 ↾ 𝐴)𝑢 ↔ (𝑢 ∈ 𝐴 ∧ 𝑢𝑅𝑥))
4		br1cnvres 37075	. . . . . . . 8 ⊢ (𝑥 ∈ V → (𝑥◡(𝑅 ↾ 𝐴)𝑣 ↔ (𝑣 ∈ 𝐴 ∧ 𝑣𝑅𝑥)))
5	4	elv 3481	. . . . . . 7 ⊢ (𝑥◡(𝑅 ↾ 𝐴)𝑣 ↔ (𝑣 ∈ 𝐴 ∧ 𝑣𝑅𝑥))
6	3, 5	anbi12i 628	. . . . . 6 ⊢ ((𝑥◡(𝑅 ↾ 𝐴)𝑢 ∧ 𝑥◡(𝑅 ↾ 𝐴)𝑣) ↔ ((𝑢 ∈ 𝐴 ∧ 𝑢𝑅𝑥) ∧ (𝑣 ∈ 𝐴 ∧ 𝑣𝑅𝑥)))
7		an4 655	. . . . . 6 ⊢ (((𝑢 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ (𝑢𝑅𝑥 ∧ 𝑣𝑅𝑥)) ↔ ((𝑢 ∈ 𝐴 ∧ 𝑢𝑅𝑥) ∧ (𝑣 ∈ 𝐴 ∧ 𝑣𝑅𝑥)))
8	6, 7	bitr4i 278	. . . . 5 ⊢ ((𝑥◡(𝑅 ↾ 𝐴)𝑢 ∧ 𝑥◡(𝑅 ↾ 𝐴)𝑣) ↔ ((𝑢 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ (𝑢𝑅𝑥 ∧ 𝑣𝑅𝑥)))
9	8	exbii 1851	. . . 4 ⊢ (∃𝑥(𝑥◡(𝑅 ↾ 𝐴)𝑢 ∧ 𝑥◡(𝑅 ↾ 𝐴)𝑣) ↔ ∃𝑥((𝑢 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ (𝑢𝑅𝑥 ∧ 𝑣𝑅𝑥)))
10		19.42v 1958	. . . 4 ⊢ (∃𝑥((𝑢 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ (𝑢𝑅𝑥 ∧ 𝑣𝑅𝑥)) ↔ ((𝑢 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ ∃𝑥(𝑢𝑅𝑥 ∧ 𝑣𝑅𝑥)))
11	9, 10	bitri 275	. . 3 ⊢ (∃𝑥(𝑥◡(𝑅 ↾ 𝐴)𝑢 ∧ 𝑥◡(𝑅 ↾ 𝐴)𝑣) ↔ ((𝑢 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ ∃𝑥(𝑢𝑅𝑥 ∧ 𝑣𝑅𝑥)))
12	11	opabbii 5214	. 2 ⊢ {⟨𝑢, 𝑣⟩ ∣ ∃𝑥(𝑥◡(𝑅 ↾ 𝐴)𝑢 ∧ 𝑥◡(𝑅 ↾ 𝐴)𝑣)} = {⟨𝑢, 𝑣⟩ ∣ ((𝑢 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ ∃𝑥(𝑢𝑅𝑥 ∧ 𝑣𝑅𝑥))}
13	1, 12	eqtri 2761	1 ⊢ ≀ ◡(𝑅 ↾ 𝐴) = {⟨𝑢, 𝑣⟩ ∣ ((𝑢 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ ∃𝑥(𝑢𝑅𝑥 ∧ 𝑣𝑅𝑥))}

Syntax hints:   ↔ wb 205   ∧ wa 397   = wceq 1542  ∃wex 1782   ∈ wcel 2107  Vcvv 3475   class class class wbr 5147  {copab 5209  ^◡ccnv 5674   ↾ cres 5677   ≀ ccoss 36981

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2109  ax-9 2117  ax-ext 2704  ax-sep 5298  ax-nul 5305  ax-pr 5426

This theorem depends on definitions:  df-bi 206  df-an 398  df-or 847  df-3an 1090  df-tru 1545  df-fal 1555  df-ex 1783  df-sb 2069  df-clab 2711  df-cleq 2725  df-clel 2811  df-ral 3063  df-rex 3072  df-rab 3434  df-v 3477  df-dif 3950  df-un 3952  df-in 3954  df-ss 3964  df-nul 4322  df-if 4528  df-sn 4628  df-pr 4630  df-op 4634  df-br 5148  df-opab 5210  df-xp 5681  df-rel 5682  df-cnv 5683  df-res 5687  df-coss 37219

This theorem is referenced by:  coss2cnvepres  37226