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Theorem opeliun2xp 47096
Description: Membership of an ordered pair in a union of Cartesian products over its second component, analogous to opeliunxp 5742. (Contributed by AV, 30-Mar-2019.)
Assertion
Ref Expression
opeliun2xp (⟨𝐶, 𝑦⟩ ∈ 𝑦𝐵 (𝐴 × {𝑦}) ↔ (𝑦𝐵𝐶𝐴))

Proof of Theorem opeliun2xp
Dummy variables 𝑥 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 df-iun 4998 . . 3 𝑦𝐵 (𝐴 × {𝑦}) = {𝑥 ∣ ∃𝑦𝐵 𝑥 ∈ (𝐴 × {𝑦})}
21eleq2i 2823 . 2 (⟨𝐶, 𝑦⟩ ∈ 𝑦𝐵 (𝐴 × {𝑦}) ↔ ⟨𝐶, 𝑦⟩ ∈ {𝑥 ∣ ∃𝑦𝐵 𝑥 ∈ (𝐴 × {𝑦})})
3 opex 5463 . . 3 𝐶, 𝑦⟩ ∈ V
4 df-rex 3069 . . . . 5 (∃𝑦𝐵 𝑥 ∈ (𝐴 × {𝑦}) ↔ ∃𝑦(𝑦𝐵𝑥 ∈ (𝐴 × {𝑦})))
5 nfv 1915 . . . . . 6 𝑧(𝑦𝐵𝑥 ∈ (𝐴 × {𝑦}))
6 nfs1v 2151 . . . . . . 7 𝑦[𝑧 / 𝑦]𝑦𝐵
7 nfcsb1v 3917 . . . . . . . . 9 𝑦𝑧 / 𝑦𝐴
8 nfcv 2901 . . . . . . . . 9 𝑦{𝑧}
97, 8nfxp 5708 . . . . . . . 8 𝑦(𝑧 / 𝑦𝐴 × {𝑧})
109nfcri 2888 . . . . . . 7 𝑦 𝑥 ∈ (𝑧 / 𝑦𝐴 × {𝑧})
116, 10nfan 1900 . . . . . 6 𝑦([𝑧 / 𝑦]𝑦𝐵𝑥 ∈ (𝑧 / 𝑦𝐴 × {𝑧}))
12 sbequ12 2241 . . . . . . 7 (𝑦 = 𝑧 → (𝑦𝐵 ↔ [𝑧 / 𝑦]𝑦𝐵))
13 csbeq1a 3906 . . . . . . . . 9 (𝑦 = 𝑧𝐴 = 𝑧 / 𝑦𝐴)
14 sneq 4637 . . . . . . . . 9 (𝑦 = 𝑧 → {𝑦} = {𝑧})
1513, 14xpeq12d 5706 . . . . . . . 8 (𝑦 = 𝑧 → (𝐴 × {𝑦}) = (𝑧 / 𝑦𝐴 × {𝑧}))
1615eleq2d 2817 . . . . . . 7 (𝑦 = 𝑧 → (𝑥 ∈ (𝐴 × {𝑦}) ↔ 𝑥 ∈ (𝑧 / 𝑦𝐴 × {𝑧})))
1712, 16anbi12d 629 . . . . . 6 (𝑦 = 𝑧 → ((𝑦𝐵𝑥 ∈ (𝐴 × {𝑦})) ↔ ([𝑧 / 𝑦]𝑦𝐵𝑥 ∈ (𝑧 / 𝑦𝐴 × {𝑧}))))
185, 11, 17cbvexv1 2336 . . . . 5 (∃𝑦(𝑦𝐵𝑥 ∈ (𝐴 × {𝑦})) ↔ ∃𝑧([𝑧 / 𝑦]𝑦𝐵𝑥 ∈ (𝑧 / 𝑦𝐴 × {𝑧})))
194, 18bitri 274 . . . 4 (∃𝑦𝐵 𝑥 ∈ (𝐴 × {𝑦}) ↔ ∃𝑧([𝑧 / 𝑦]𝑦𝐵𝑥 ∈ (𝑧 / 𝑦𝐴 × {𝑧})))
20 eleq1 2819 . . . . . 6 (𝑥 = ⟨𝐶, 𝑦⟩ → (𝑥 ∈ (𝑧 / 𝑦𝐴 × {𝑧}) ↔ ⟨𝐶, 𝑦⟩ ∈ (𝑧 / 𝑦𝐴 × {𝑧})))
2120anbi2d 627 . . . . 5 (𝑥 = ⟨𝐶, 𝑦⟩ → (([𝑧 / 𝑦]𝑦𝐵𝑥 ∈ (𝑧 / 𝑦𝐴 × {𝑧})) ↔ ([𝑧 / 𝑦]𝑦𝐵 ∧ ⟨𝐶, 𝑦⟩ ∈ (𝑧 / 𝑦𝐴 × {𝑧}))))
2221exbidv 1922 . . . 4 (𝑥 = ⟨𝐶, 𝑦⟩ → (∃𝑧([𝑧 / 𝑦]𝑦𝐵𝑥 ∈ (𝑧 / 𝑦𝐴 × {𝑧})) ↔ ∃𝑧([𝑧 / 𝑦]𝑦𝐵 ∧ ⟨𝐶, 𝑦⟩ ∈ (𝑧 / 𝑦𝐴 × {𝑧}))))
2319, 22bitrid 282 . . 3 (𝑥 = ⟨𝐶, 𝑦⟩ → (∃𝑦𝐵 𝑥 ∈ (𝐴 × {𝑦}) ↔ ∃𝑧([𝑧 / 𝑦]𝑦𝐵 ∧ ⟨𝐶, 𝑦⟩ ∈ (𝑧 / 𝑦𝐴 × {𝑧}))))
243, 23elab 3667 . 2 (⟨𝐶, 𝑦⟩ ∈ {𝑥 ∣ ∃𝑦𝐵 𝑥 ∈ (𝐴 × {𝑦})} ↔ ∃𝑧([𝑧 / 𝑦]𝑦𝐵 ∧ ⟨𝐶, 𝑦⟩ ∈ (𝑧 / 𝑦𝐴 × {𝑧})))
25 opelxp 5711 . . . . . 6 (⟨𝐶, 𝑦⟩ ∈ (𝑧 / 𝑦𝐴 × {𝑧}) ↔ (𝐶𝑧 / 𝑦𝐴𝑦 ∈ {𝑧}))
2625anbi2i 621 . . . . 5 (([𝑧 / 𝑦]𝑦𝐵 ∧ ⟨𝐶, 𝑦⟩ ∈ (𝑧 / 𝑦𝐴 × {𝑧})) ↔ ([𝑧 / 𝑦]𝑦𝐵 ∧ (𝐶𝑧 / 𝑦𝐴𝑦 ∈ {𝑧})))
27 an13 643 . . . . . 6 (([𝑧 / 𝑦]𝑦𝐵 ∧ (𝐶𝑧 / 𝑦𝐴𝑦 ∈ {𝑧})) ↔ (𝑦 ∈ {𝑧} ∧ (𝐶𝑧 / 𝑦𝐴 ∧ [𝑧 / 𝑦]𝑦𝐵)))
28 ancom 459 . . . . . . 7 ((𝐶𝑧 / 𝑦𝐴 ∧ [𝑧 / 𝑦]𝑦𝐵) ↔ ([𝑧 / 𝑦]𝑦𝐵𝐶𝑧 / 𝑦𝐴))
2928anbi2i 621 . . . . . 6 ((𝑦 ∈ {𝑧} ∧ (𝐶𝑧 / 𝑦𝐴 ∧ [𝑧 / 𝑦]𝑦𝐵)) ↔ (𝑦 ∈ {𝑧} ∧ ([𝑧 / 𝑦]𝑦𝐵𝐶𝑧 / 𝑦𝐴)))
3027, 29bitri 274 . . . . 5 (([𝑧 / 𝑦]𝑦𝐵 ∧ (𝐶𝑧 / 𝑦𝐴𝑦 ∈ {𝑧})) ↔ (𝑦 ∈ {𝑧} ∧ ([𝑧 / 𝑦]𝑦𝐵𝐶𝑧 / 𝑦𝐴)))
31 velsn 4643 . . . . . . 7 (𝑦 ∈ {𝑧} ↔ 𝑦 = 𝑧)
32 equcom 2019 . . . . . . 7 (𝑦 = 𝑧𝑧 = 𝑦)
3331, 32bitri 274 . . . . . 6 (𝑦 ∈ {𝑧} ↔ 𝑧 = 𝑦)
3433anbi1i 622 . . . . 5 ((𝑦 ∈ {𝑧} ∧ ([𝑧 / 𝑦]𝑦𝐵𝐶𝑧 / 𝑦𝐴)) ↔ (𝑧 = 𝑦 ∧ ([𝑧 / 𝑦]𝑦𝐵𝐶𝑧 / 𝑦𝐴)))
3526, 30, 343bitri 296 . . . 4 (([𝑧 / 𝑦]𝑦𝐵 ∧ ⟨𝐶, 𝑦⟩ ∈ (𝑧 / 𝑦𝐴 × {𝑧})) ↔ (𝑧 = 𝑦 ∧ ([𝑧 / 𝑦]𝑦𝐵𝐶𝑧 / 𝑦𝐴)))
3635exbii 1848 . . 3 (∃𝑧([𝑧 / 𝑦]𝑦𝐵 ∧ ⟨𝐶, 𝑦⟩ ∈ (𝑧 / 𝑦𝐴 × {𝑧})) ↔ ∃𝑧(𝑧 = 𝑦 ∧ ([𝑧 / 𝑦]𝑦𝐵𝐶𝑧 / 𝑦𝐴)))
37 sbequ12r 2242 . . . . 5 (𝑧 = 𝑦 → ([𝑧 / 𝑦]𝑦𝐵𝑦𝐵))
3813equcoms 2021 . . . . . . 7 (𝑧 = 𝑦𝐴 = 𝑧 / 𝑦𝐴)
3938eqcomd 2736 . . . . . 6 (𝑧 = 𝑦𝑧 / 𝑦𝐴 = 𝐴)
4039eleq2d 2817 . . . . 5 (𝑧 = 𝑦 → (𝐶𝑧 / 𝑦𝐴𝐶𝐴))
4137, 40anbi12d 629 . . . 4 (𝑧 = 𝑦 → (([𝑧 / 𝑦]𝑦𝐵𝐶𝑧 / 𝑦𝐴) ↔ (𝑦𝐵𝐶𝐴)))
4241equsexvw 2006 . . 3 (∃𝑧(𝑧 = 𝑦 ∧ ([𝑧 / 𝑦]𝑦𝐵𝐶𝑧 / 𝑦𝐴)) ↔ (𝑦𝐵𝐶𝐴))
4336, 42bitri 274 . 2 (∃𝑧([𝑧 / 𝑦]𝑦𝐵 ∧ ⟨𝐶, 𝑦⟩ ∈ (𝑧 / 𝑦𝐴 × {𝑧})) ↔ (𝑦𝐵𝐶𝐴))
442, 24, 433bitri 296 1 (⟨𝐶, 𝑦⟩ ∈ 𝑦𝐵 (𝐴 × {𝑦}) ↔ (𝑦𝐵𝐶𝐴))
Colors of variables: wff setvar class
Syntax hints:  wb 205  wa 394   = wceq 1539  wex 1779  [wsb 2065  wcel 2104  {cab 2707  wrex 3068  csb 3892  {csn 4627  cop 4633   ciun 4996   × cxp 5673
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1911  ax-6 1969  ax-7 2009  ax-8 2106  ax-9 2114  ax-10 2135  ax-11 2152  ax-12 2169  ax-ext 2701  ax-sep 5298  ax-nul 5305  ax-pr 5426
This theorem depends on definitions:  df-bi 206  df-an 395  df-or 844  df-3an 1087  df-tru 1542  df-fal 1552  df-ex 1780  df-nf 1784  df-sb 2066  df-clab 2708  df-cleq 2722  df-clel 2808  df-nfc 2883  df-ral 3060  df-rex 3069  df-rab 3431  df-v 3474  df-sbc 3777  df-csb 3893  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-iun 4998  df-opab 5210  df-xp 5681
This theorem is referenced by:  eliunxp2  47097
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