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Theorem cnviin 5710
 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 5538 . 2 Rel 𝑥𝐴 𝐵
2 relcnv 5538 . . . . . . 7 Rel 𝐵
3 df-rel 5150 . . . . . . 7 (Rel 𝐵𝐵 ⊆ (V × V))
42, 3mpbi 220 . . . . . 6 𝐵 ⊆ (V × V)
54rgenw 2953 . . . . 5 𝑥𝐴 𝐵 ⊆ (V × V)
6 r19.2z 4093 . . . . 5 ((𝐴 ≠ ∅ ∧ ∀𝑥𝐴 𝐵 ⊆ (V × V)) → ∃𝑥𝐴 𝐵 ⊆ (V × V))
75, 6mpan2 707 . . . 4 (𝐴 ≠ ∅ → ∃𝑥𝐴 𝐵 ⊆ (V × V))
8 iinss 4603 . . . 4 (∃𝑥𝐴 𝐵 ⊆ (V × V) → 𝑥𝐴 𝐵 ⊆ (V × V))
97, 8syl 17 . . 3 (𝐴 ≠ ∅ → 𝑥𝐴 𝐵 ⊆ (V × V))
10 df-rel 5150 . . 3 (Rel 𝑥𝐴 𝐵 𝑥𝐴 𝐵 ⊆ (V × V))
119, 10sylibr 224 . 2 (𝐴 ≠ ∅ → Rel 𝑥𝐴 𝐵)
12 opex 4962 . . . . 5 𝑏, 𝑎⟩ ∈ V
13 eliin 4557 . . . . 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 3234 . . . . 5 𝑎 ∈ V
16 vex 3234 . . . . 5 𝑏 ∈ V
1715, 16opelcnv 5336 . . . 4 (⟨𝑎, 𝑏⟩ ∈ 𝑥𝐴 𝐵 ↔ ⟨𝑏, 𝑎⟩ ∈ 𝑥𝐴 𝐵)
18 opex 4962 . . . . . 6 𝑎, 𝑏⟩ ∈ V
19 eliin 4557 . . . . . 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 5336 . . . . . 6 (⟨𝑎, 𝑏⟩ ∈ 𝐵 ↔ ⟨𝑏, 𝑎⟩ ∈ 𝐵)
2221ralbii 3009 . . . . 5 (∀𝑥𝐴𝑎, 𝑏⟩ ∈ 𝐵 ↔ ∀𝑥𝐴𝑏, 𝑎⟩ ∈ 𝐵)
2320, 22bitri 264 . . . 4 (⟨𝑎, 𝑏⟩ ∈ 𝑥𝐴 𝐵 ↔ ∀𝑥𝐴𝑏, 𝑎⟩ ∈ 𝐵)
2414, 17, 233bitr4i 292 . . 3 (⟨𝑎, 𝑏⟩ ∈ 𝑥𝐴 𝐵 ↔ ⟨𝑎, 𝑏⟩ ∈ 𝑥𝐴 𝐵)
2524eqrelriv 5247 . 2 ((Rel 𝑥𝐴 𝐵 ∧ Rel 𝑥𝐴 𝐵) → 𝑥𝐴 𝐵 = 𝑥𝐴 𝐵)
261, 11, 25sylancr 696 1 (𝐴 ≠ ∅ → 𝑥𝐴 𝐵 = 𝑥𝐴 𝐵)
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 196   = wceq 1523   ∈ wcel 2030   ≠ wne 2823  ∀wral 2941  ∃wrex 2942  Vcvv 3231   ⊆ wss 3607  ∅c0 3948  ⟨cop 4216  ∩ ciin 4553   × cxp 5141  ◡ccnv 5142  Rel wrel 5148 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-sep 4814  ax-nul 4822  ax-pr 4936 This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ne 2824  df-ral 2946  df-rex 2947  df-rab 2950  df-v 3233  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-nul 3949  df-if 4120  df-sn 4211  df-pr 4213  df-op 4217  df-iin 4555  df-br 4686  df-opab 4746  df-xp 5149  df-rel 5150  df-cnv 5151 This theorem is referenced by: (None)
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