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Theorem br1cossxrncnvepres 39394
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 (((𝐵 ∈ 𝑉 ∧ 𝐶 ∈ 𝑊) ∧ (𝐷 ∈ 𝑋 ∧ 𝐸 ∈ 𝑌)) → (⟨𝐵, 𝐶⟩ ≀ (𝑅 ⋉ (◡ E ↾ 𝐴))⟨𝐷, 𝐸⟩ ↔ ∃𝑢 ∈ 𝐴 ((𝐶 ∈ 𝑢 ∧ 𝑢𝑅𝐵) ∧ (𝐸 ∈ 𝑢 ∧ 𝑢𝑅𝐷))))
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 39390 . 2 (((𝐵 ∈ 𝑉 ∧ 𝐶 ∈ 𝑊) ∧ (𝐷 ∈ 𝑋 ∧ 𝐸 ∈ 𝑌)) → (⟨𝐵, 𝐶⟩ ≀ (𝑅 ⋉ (◡ E ↾ 𝐴))⟨𝐷, 𝐸⟩ ↔ ∃𝑢 ∈ 𝐴 ((𝑢◡ E 𝐶 ∧ 𝑢𝑅𝐵) ∧ (𝑢◡ E 𝐸 ∧ 𝑢𝑅𝐷))))
2 brcnvep 39122 . . . . . 6 (𝑢 ∈ V → (𝑢◡ E 𝐶 ↔ 𝐶 ∈ 𝑢))
32elv 3455 . . . . 5 (𝑢◡ E 𝐶 ↔ 𝐶 ∈ 𝑢)
43anbi1i 636 . . . 4 ((𝑢◡ E 𝐶 ∧ 𝑢𝑅𝐵) ↔ (𝐶 ∈ 𝑢 ∧ 𝑢𝑅𝐵))
5 brcnvep 39122 . . . . . 6 (𝑢 ∈ V → (𝑢◡ E 𝐸 ↔ 𝐸 ∈ 𝑢))
65elv 3455 . . . . 5 (𝑢◡ E 𝐸 ↔ 𝐸 ∈ 𝑢)
76anbi1i 636 . . . 4 ((𝑢◡ E 𝐸 ∧ 𝑢𝑅𝐷) ↔ (𝐸 ∈ 𝑢 ∧ 𝑢𝑅𝐷))
84, 7anbi12i 640 . . 3 (((𝑢◡ E 𝐶 ∧ 𝑢𝑅𝐵) ∧ (𝑢◡ E 𝐸 ∧ 𝑢𝑅𝐷)) ↔ ((𝐶 ∈ 𝑢 ∧ 𝑢𝑅𝐵) ∧ (𝐸 ∈ 𝑢 ∧ 𝑢𝑅𝐷)))
98rexbii 3109 . 2 (∃𝑢 ∈ 𝐴 ((𝑢◡ E 𝐶 ∧ 𝑢𝑅𝐵) ∧ (𝑢◡ E 𝐸 ∧ 𝑢𝑅𝐷)) ↔ ∃𝑢 ∈ 𝐴 ((𝐶 ∈ 𝑢 ∧ 𝑢𝑅𝐵) ∧ (𝐸 ∈ 𝑢 ∧ 𝑢𝑅𝐷)))
101, 9bitrdi 290 1 (((𝐵 ∈ 𝑉 ∧ 𝐶 ∈ 𝑊) ∧ (𝐷 ∈ 𝑋 ∧ 𝐸 ∈ 𝑌)) → (⟨𝐵, 𝐶⟩ ≀ (𝑅 ⋉ (◡ E ↾ 𝐴))⟨𝐷, 𝐸⟩ ↔ ∃𝑢 ∈ 𝐴 ((𝐶 ∈ 𝑢 ∧ 𝑢𝑅𝐵) ∧ (𝐸 ∈ 𝑢 ∧ 𝑢𝑅𝐷))))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ↔ wb 209   ∧ wa 401   ∈ wcel 2145  ∃wrex 3086  Vcvv 3450  ⟨cop 4589   class class class wbr 5102   E cep 5546  ◡ccnv 5646   ↾ cres 5649   ⋉ cxrn 39026   ≀ ccoss 39035
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2213  ax-ext 2732  ax-sep 5248  ax-nul 5259  ax-pr 5390  ax-un 7734
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2564  df-eu 2594  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-ne 2956  df-ral 3077  df-rex 3087  df-rab 3413  df-v 3452  df-dif 3901  df-un 3903  df-in 3905  df-ss 3915  df-nul 4279  df-if 4482  df-sn 4584  df-pr 4586  df-op 4590  df-uni 4867  df-br 5103  df-opab 5167  df-mpt 5186  df-id 5542  df-eprel 5547  df-xp 5653  df-rel 5654  df-cnv 5655  df-co 5656  df-dm 5657  df-rn 5658  df-res 5659  df-iota 6483  df-fun 6529  df-fn 6530  df-f 6531  df-fo 6533  df-fv 6535  df-1st 7984  df-2nd 7985  df-xrn 39232  df-coss 39353
This theorem is used by: (None)
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