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Theorem br1cossxrncnvepres 38712
Description: 𝐵, 𝐶 and 𝐷, 𝐸 are cosets by a range Cartesian product with the restricted converse epsilon class: a binary relation. (Contributed by Peter Mazsa, 12-May-2021.)
Assertion
Ref Expression
br1cossxrncnvepres (((𝐵𝑉𝐶𝑊) ∧ (𝐷𝑋𝐸𝑌)) → (⟨𝐵, 𝐶⟩ ≀ (𝑅 ⋉ ( E ↾ 𝐴))⟨𝐷, 𝐸⟩ ↔ ∃𝑢𝐴 ((𝐶𝑢𝑢𝑅𝐵) ∧ (𝐸𝑢𝑢𝑅𝐷))))
Distinct variable groups:   𝑢,𝐴   𝑢,𝐵   𝑢,𝐶   𝑢,𝐷   𝑢,𝐸   𝑢,𝑅   𝑢,𝑉   𝑢,𝑊   𝑢,𝑋   𝑢,𝑌

Proof of Theorem br1cossxrncnvepres
StepHypRef Expression
1 br1cossxrnres 38708 . 2 (((𝐵𝑉𝐶𝑊) ∧ (𝐷𝑋𝐸𝑌)) → (⟨𝐵, 𝐶⟩ ≀ (𝑅 ⋉ ( E ↾ 𝐴))⟨𝐷, 𝐸⟩ ↔ ∃𝑢𝐴 ((𝑢 E 𝐶𝑢𝑅𝐵) ∧ (𝑢 E 𝐸𝑢𝑅𝐷))))
2 brcnvep 38440 . . . . . 6 (𝑢 ∈ V → (𝑢 E 𝐶𝐶𝑢))
32elv 3444 . . . . 5 (𝑢 E 𝐶𝐶𝑢)
43anbi1i 625 . . . 4 ((𝑢 E 𝐶𝑢𝑅𝐵) ↔ (𝐶𝑢𝑢𝑅𝐵))
5 brcnvep 38440 . . . . . 6 (𝑢 ∈ V → (𝑢 E 𝐸𝐸𝑢))
65elv 3444 . . . . 5 (𝑢 E 𝐸𝐸𝑢)
76anbi1i 625 . . . 4 ((𝑢 E 𝐸𝑢𝑅𝐷) ↔ (𝐸𝑢𝑢𝑅𝐷))
84, 7anbi12i 629 . . 3 (((𝑢 E 𝐶𝑢𝑅𝐵) ∧ (𝑢 E 𝐸𝑢𝑅𝐷)) ↔ ((𝐶𝑢𝑢𝑅𝐵) ∧ (𝐸𝑢𝑢𝑅𝐷)))
98rexbii 3082 . 2 (∃𝑢𝐴 ((𝑢 E 𝐶𝑢𝑅𝐵) ∧ (𝑢 E 𝐸𝑢𝑅𝐷)) ↔ ∃𝑢𝐴 ((𝐶𝑢𝑢𝑅𝐵) ∧ (𝐸𝑢𝑢𝑅𝐷)))
101, 9bitrdi 287 1 (((𝐵𝑉𝐶𝑊) ∧ (𝐷𝑋𝐸𝑌)) → (⟨𝐵, 𝐶⟩ ≀ (𝑅 ⋉ ( E ↾ 𝐴))⟨𝐷, 𝐸⟩ ↔ ∃𝑢𝐴 ((𝐶𝑢𝑢𝑅𝐵) ∧ (𝐸𝑢𝑢𝑅𝐷))))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 206  wa 395  wcel 2114  wrex 3059  Vcvv 3439  cop 4585   class class class wbr 5097   E cep 5522  ccnv 5622  cres 5625  cxrn 38344  ccoss 38353
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2183  ax-ext 2707  ax-sep 5240  ax-nul 5250  ax-pr 5376  ax-un 7680
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2538  df-eu 2568  df-clab 2714  df-cleq 2727  df-clel 2810  df-nfc 2884  df-ne 2932  df-ral 3051  df-rex 3060  df-rab 3399  df-v 3441  df-dif 3903  df-un 3905  df-in 3907  df-ss 3917  df-nul 4285  df-if 4479  df-sn 4580  df-pr 4582  df-op 4586  df-uni 4863  df-br 5098  df-opab 5160  df-mpt 5179  df-id 5518  df-eprel 5523  df-xp 5629  df-rel 5630  df-cnv 5631  df-co 5632  df-dm 5633  df-rn 5634  df-res 5635  df-iota 6447  df-fun 6493  df-fn 6494  df-f 6495  df-fo 6497  df-fv 6499  df-1st 7933  df-2nd 7934  df-xrn 38550  df-coss 38671
This theorem is referenced by: (None)
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