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Theorem cnviin 6286
Description: The converse of an intersection is the intersection of the converse. (Contributed by FL, 15-Oct-2012.)
Assertion
Ref Expression
cnviin (𝐴 ≠ ∅ → 𝑥𝐴 𝐵 = 𝑥𝐴 𝐵)
Distinct variable group:   𝑥,𝐴
Allowed substitution hint:   𝐵(𝑥)

Proof of Theorem cnviin
Dummy variables 𝑎 𝑏 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 relcnv 6104 . 2 Rel 𝑥𝐴 𝐵
2 relcnv 6104 . . . . . . 7 Rel 𝐵
3 df-rel 5684 . . . . . . 7 (Rel 𝐵𝐵 ⊆ (V × V))
42, 3mpbi 229 . . . . . 6 𝐵 ⊆ (V × V)
54rgenw 3066 . . . . 5 𝑥𝐴 𝐵 ⊆ (V × V)
6 r19.2z 4495 . . . . 5 ((𝐴 ≠ ∅ ∧ ∀𝑥𝐴 𝐵 ⊆ (V × V)) → ∃𝑥𝐴 𝐵 ⊆ (V × V))
75, 6mpan2 690 . . . 4 (𝐴 ≠ ∅ → ∃𝑥𝐴 𝐵 ⊆ (V × V))
8 iinss 5060 . . . 4 (∃𝑥𝐴 𝐵 ⊆ (V × V) → 𝑥𝐴 𝐵 ⊆ (V × V))
97, 8syl 17 . . 3 (𝐴 ≠ ∅ → 𝑥𝐴 𝐵 ⊆ (V × V))
10 df-rel 5684 . . 3 (Rel 𝑥𝐴 𝐵 𝑥𝐴 𝐵 ⊆ (V × V))
119, 10sylibr 233 . 2 (𝐴 ≠ ∅ → Rel 𝑥𝐴 𝐵)
12 opex 5465 . . . . 5 𝑏, 𝑎⟩ ∈ V
13 eliin 5003 . . . . 5 (⟨𝑏, 𝑎⟩ ∈ V → (⟨𝑏, 𝑎⟩ ∈ 𝑥𝐴 𝐵 ↔ ∀𝑥𝐴𝑏, 𝑎⟩ ∈ 𝐵))
1412, 13ax-mp 5 . . . 4 (⟨𝑏, 𝑎⟩ ∈ 𝑥𝐴 𝐵 ↔ ∀𝑥𝐴𝑏, 𝑎⟩ ∈ 𝐵)
15 vex 3479 . . . . 5 𝑎 ∈ V
16 vex 3479 . . . . 5 𝑏 ∈ V
1715, 16opelcnv 5882 . . . 4 (⟨𝑎, 𝑏⟩ ∈ 𝑥𝐴 𝐵 ↔ ⟨𝑏, 𝑎⟩ ∈ 𝑥𝐴 𝐵)
18 opex 5465 . . . . . 6 𝑎, 𝑏⟩ ∈ V
19 eliin 5003 . . . . . 6 (⟨𝑎, 𝑏⟩ ∈ V → (⟨𝑎, 𝑏⟩ ∈ 𝑥𝐴 𝐵 ↔ ∀𝑥𝐴𝑎, 𝑏⟩ ∈ 𝐵))
2018, 19ax-mp 5 . . . . 5 (⟨𝑎, 𝑏⟩ ∈ 𝑥𝐴 𝐵 ↔ ∀𝑥𝐴𝑎, 𝑏⟩ ∈ 𝐵)
2115, 16opelcnv 5882 . . . . . 6 (⟨𝑎, 𝑏⟩ ∈ 𝐵 ↔ ⟨𝑏, 𝑎⟩ ∈ 𝐵)
2221ralbii 3094 . . . . 5 (∀𝑥𝐴𝑎, 𝑏⟩ ∈ 𝐵 ↔ ∀𝑥𝐴𝑏, 𝑎⟩ ∈ 𝐵)
2320, 22bitri 275 . . . 4 (⟨𝑎, 𝑏⟩ ∈ 𝑥𝐴 𝐵 ↔ ∀𝑥𝐴𝑏, 𝑎⟩ ∈ 𝐵)
2414, 17, 233bitr4i 303 . . 3 (⟨𝑎, 𝑏⟩ ∈ 𝑥𝐴 𝐵 ↔ ⟨𝑎, 𝑏⟩ ∈ 𝑥𝐴 𝐵)
2524eqrelriv 5790 . 2 ((Rel 𝑥𝐴 𝐵 ∧ Rel 𝑥𝐴 𝐵) → 𝑥𝐴 𝐵 = 𝑥𝐴 𝐵)
261, 11, 25sylancr 588 1 (𝐴 ≠ ∅ → 𝑥𝐴 𝐵 = 𝑥𝐴 𝐵)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205   = wceq 1542  wcel 2107  wne 2941  wral 3062  wrex 3071  Vcvv 3475  wss 3949  c0 4323  cop 4635   ciin 4999   × cxp 5675  ccnv 5676  Rel wrel 5682
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 5300  ax-nul 5307  ax-pr 5428
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-ne 2942  df-ral 3063  df-rex 3072  df-rab 3434  df-v 3477  df-dif 3952  df-un 3954  df-in 3956  df-ss 3966  df-nul 4324  df-if 4530  df-sn 4630  df-pr 4632  df-op 4636  df-iin 5001  df-br 5150  df-opab 5212  df-xp 5683  df-rel 5684  df-cnv 5685
This theorem is referenced by: (None)
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