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Theorem opthprc 4418
Description: Justification theorem for an ordered pair definition that works for any classes, including proper classes. This is a possible definition implied by the footnote in [Jech] p. 78, which says, "The sophisticated reader will not object to our use of a pair of classes." (Contributed by NM, 28-Sep-2003.)
Assertion
Ref Expression
opthprc (((𝐴 × {∅}) ∪ (𝐵 × {{∅}})) = ((𝐶 × {∅}) ∪ (𝐷 × {{∅}})) ↔ (𝐴 = 𝐶𝐵 = 𝐷))

Proof of Theorem opthprc
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 eleq2 2117 . . . . 5 (((𝐴 × {∅}) ∪ (𝐵 × {{∅}})) = ((𝐶 × {∅}) ∪ (𝐷 × {{∅}})) → (⟨𝑥, ∅⟩ ∈ ((𝐴 × {∅}) ∪ (𝐵 × {{∅}})) ↔ ⟨𝑥, ∅⟩ ∈ ((𝐶 × {∅}) ∪ (𝐷 × {{∅}}))))
2 0ex 3911 . . . . . . . . 9 ∅ ∈ V
32snid 3429 . . . . . . . 8 ∅ ∈ {∅}
4 opelxp 4401 . . . . . . . 8 (⟨𝑥, ∅⟩ ∈ (𝐴 × {∅}) ↔ (𝑥𝐴 ∧ ∅ ∈ {∅}))
53, 4mpbiran2 859 . . . . . . 7 (⟨𝑥, ∅⟩ ∈ (𝐴 × {∅}) ↔ 𝑥𝐴)
6 opelxp 4401 . . . . . . . 8 (⟨𝑥, ∅⟩ ∈ (𝐵 × {{∅}}) ↔ (𝑥𝐵 ∧ ∅ ∈ {{∅}}))
7 0nep0 3945 . . . . . . . . . 10 ∅ ≠ {∅}
82elsn 3418 . . . . . . . . . 10 (∅ ∈ {{∅}} ↔ ∅ = {∅})
97, 8nemtbir 2309 . . . . . . . . 9 ¬ ∅ ∈ {{∅}}
109bianfi 865 . . . . . . . 8 (∅ ∈ {{∅}} ↔ (𝑥𝐵 ∧ ∅ ∈ {{∅}}))
116, 10bitr4i 180 . . . . . . 7 (⟨𝑥, ∅⟩ ∈ (𝐵 × {{∅}}) ↔ ∅ ∈ {{∅}})
125, 11orbi12i 691 . . . . . 6 ((⟨𝑥, ∅⟩ ∈ (𝐴 × {∅}) ∨ ⟨𝑥, ∅⟩ ∈ (𝐵 × {{∅}})) ↔ (𝑥𝐴 ∨ ∅ ∈ {{∅}}))
13 elun 3111 . . . . . 6 (⟨𝑥, ∅⟩ ∈ ((𝐴 × {∅}) ∪ (𝐵 × {{∅}})) ↔ (⟨𝑥, ∅⟩ ∈ (𝐴 × {∅}) ∨ ⟨𝑥, ∅⟩ ∈ (𝐵 × {{∅}})))
149biorfi 675 . . . . . 6 (𝑥𝐴 ↔ (𝑥𝐴 ∨ ∅ ∈ {{∅}}))
1512, 13, 143bitr4ri 206 . . . . 5 (𝑥𝐴 ↔ ⟨𝑥, ∅⟩ ∈ ((𝐴 × {∅}) ∪ (𝐵 × {{∅}})))
16 opelxp 4401 . . . . . . . 8 (⟨𝑥, ∅⟩ ∈ (𝐶 × {∅}) ↔ (𝑥𝐶 ∧ ∅ ∈ {∅}))
173, 16mpbiran2 859 . . . . . . 7 (⟨𝑥, ∅⟩ ∈ (𝐶 × {∅}) ↔ 𝑥𝐶)
18 opelxp 4401 . . . . . . . 8 (⟨𝑥, ∅⟩ ∈ (𝐷 × {{∅}}) ↔ (𝑥𝐷 ∧ ∅ ∈ {{∅}}))
199bianfi 865 . . . . . . . 8 (∅ ∈ {{∅}} ↔ (𝑥𝐷 ∧ ∅ ∈ {{∅}}))
2018, 19bitr4i 180 . . . . . . 7 (⟨𝑥, ∅⟩ ∈ (𝐷 × {{∅}}) ↔ ∅ ∈ {{∅}})
2117, 20orbi12i 691 . . . . . 6 ((⟨𝑥, ∅⟩ ∈ (𝐶 × {∅}) ∨ ⟨𝑥, ∅⟩ ∈ (𝐷 × {{∅}})) ↔ (𝑥𝐶 ∨ ∅ ∈ {{∅}}))
22 elun 3111 . . . . . 6 (⟨𝑥, ∅⟩ ∈ ((𝐶 × {∅}) ∪ (𝐷 × {{∅}})) ↔ (⟨𝑥, ∅⟩ ∈ (𝐶 × {∅}) ∨ ⟨𝑥, ∅⟩ ∈ (𝐷 × {{∅}})))
239biorfi 675 . . . . . 6 (𝑥𝐶 ↔ (𝑥𝐶 ∨ ∅ ∈ {{∅}}))
2421, 22, 233bitr4ri 206 . . . . 5 (𝑥𝐶 ↔ ⟨𝑥, ∅⟩ ∈ ((𝐶 × {∅}) ∪ (𝐷 × {{∅}})))
251, 15, 243bitr4g 216 . . . 4 (((𝐴 × {∅}) ∪ (𝐵 × {{∅}})) = ((𝐶 × {∅}) ∪ (𝐷 × {{∅}})) → (𝑥𝐴𝑥𝐶))
2625eqrdv 2054 . . 3 (((𝐴 × {∅}) ∪ (𝐵 × {{∅}})) = ((𝐶 × {∅}) ∪ (𝐷 × {{∅}})) → 𝐴 = 𝐶)
27 eleq2 2117 . . . . 5 (((𝐴 × {∅}) ∪ (𝐵 × {{∅}})) = ((𝐶 × {∅}) ∪ (𝐷 × {{∅}})) → (⟨𝑥, {∅}⟩ ∈ ((𝐴 × {∅}) ∪ (𝐵 × {{∅}})) ↔ ⟨𝑥, {∅}⟩ ∈ ((𝐶 × {∅}) ∪ (𝐷 × {{∅}}))))
28 opelxp 4401 . . . . . . . 8 (⟨𝑥, {∅}⟩ ∈ (𝐴 × {∅}) ↔ (𝑥𝐴 ∧ {∅} ∈ {∅}))
29 p0ex 3966 . . . . . . . . . . . 12 {∅} ∈ V
3029elsn 3418 . . . . . . . . . . 11 ({∅} ∈ {∅} ↔ {∅} = ∅)
31 eqcom 2058 . . . . . . . . . . 11 ({∅} = ∅ ↔ ∅ = {∅})
3230, 31bitri 177 . . . . . . . . . 10 ({∅} ∈ {∅} ↔ ∅ = {∅})
337, 32nemtbir 2309 . . . . . . . . 9 ¬ {∅} ∈ {∅}
3433bianfi 865 . . . . . . . 8 ({∅} ∈ {∅} ↔ (𝑥𝐴 ∧ {∅} ∈ {∅}))
3528, 34bitr4i 180 . . . . . . 7 (⟨𝑥, {∅}⟩ ∈ (𝐴 × {∅}) ↔ {∅} ∈ {∅})
3629snid 3429 . . . . . . . 8 {∅} ∈ {{∅}}
37 opelxp 4401 . . . . . . . 8 (⟨𝑥, {∅}⟩ ∈ (𝐵 × {{∅}}) ↔ (𝑥𝐵 ∧ {∅} ∈ {{∅}}))
3836, 37mpbiran2 859 . . . . . . 7 (⟨𝑥, {∅}⟩ ∈ (𝐵 × {{∅}}) ↔ 𝑥𝐵)
3935, 38orbi12i 691 . . . . . 6 ((⟨𝑥, {∅}⟩ ∈ (𝐴 × {∅}) ∨ ⟨𝑥, {∅}⟩ ∈ (𝐵 × {{∅}})) ↔ ({∅} ∈ {∅} ∨ 𝑥𝐵))
40 elun 3111 . . . . . 6 (⟨𝑥, {∅}⟩ ∈ ((𝐴 × {∅}) ∪ (𝐵 × {{∅}})) ↔ (⟨𝑥, {∅}⟩ ∈ (𝐴 × {∅}) ∨ ⟨𝑥, {∅}⟩ ∈ (𝐵 × {{∅}})))
41 biorf 673 . . . . . . 7 (¬ {∅} ∈ {∅} → (𝑥𝐵 ↔ ({∅} ∈ {∅} ∨ 𝑥𝐵)))
4233, 41ax-mp 7 . . . . . 6 (𝑥𝐵 ↔ ({∅} ∈ {∅} ∨ 𝑥𝐵))
4339, 40, 423bitr4ri 206 . . . . 5 (𝑥𝐵 ↔ ⟨𝑥, {∅}⟩ ∈ ((𝐴 × {∅}) ∪ (𝐵 × {{∅}})))
44 opelxp 4401 . . . . . . . 8 (⟨𝑥, {∅}⟩ ∈ (𝐶 × {∅}) ↔ (𝑥𝐶 ∧ {∅} ∈ {∅}))
4533bianfi 865 . . . . . . . 8 ({∅} ∈ {∅} ↔ (𝑥𝐶 ∧ {∅} ∈ {∅}))
4644, 45bitr4i 180 . . . . . . 7 (⟨𝑥, {∅}⟩ ∈ (𝐶 × {∅}) ↔ {∅} ∈ {∅})
47 opelxp 4401 . . . . . . . 8 (⟨𝑥, {∅}⟩ ∈ (𝐷 × {{∅}}) ↔ (𝑥𝐷 ∧ {∅} ∈ {{∅}}))
4836, 47mpbiran2 859 . . . . . . 7 (⟨𝑥, {∅}⟩ ∈ (𝐷 × {{∅}}) ↔ 𝑥𝐷)
4946, 48orbi12i 691 . . . . . 6 ((⟨𝑥, {∅}⟩ ∈ (𝐶 × {∅}) ∨ ⟨𝑥, {∅}⟩ ∈ (𝐷 × {{∅}})) ↔ ({∅} ∈ {∅} ∨ 𝑥𝐷))
50 elun 3111 . . . . . 6 (⟨𝑥, {∅}⟩ ∈ ((𝐶 × {∅}) ∪ (𝐷 × {{∅}})) ↔ (⟨𝑥, {∅}⟩ ∈ (𝐶 × {∅}) ∨ ⟨𝑥, {∅}⟩ ∈ (𝐷 × {{∅}})))
51 biorf 673 . . . . . . 7 (¬ {∅} ∈ {∅} → (𝑥𝐷 ↔ ({∅} ∈ {∅} ∨ 𝑥𝐷)))
5233, 51ax-mp 7 . . . . . 6 (𝑥𝐷 ↔ ({∅} ∈ {∅} ∨ 𝑥𝐷))
5349, 50, 523bitr4ri 206 . . . . 5 (𝑥𝐷 ↔ ⟨𝑥, {∅}⟩ ∈ ((𝐶 × {∅}) ∪ (𝐷 × {{∅}})))
5427, 43, 533bitr4g 216 . . . 4 (((𝐴 × {∅}) ∪ (𝐵 × {{∅}})) = ((𝐶 × {∅}) ∪ (𝐷 × {{∅}})) → (𝑥𝐵𝑥𝐷))
5554eqrdv 2054 . . 3 (((𝐴 × {∅}) ∪ (𝐵 × {{∅}})) = ((𝐶 × {∅}) ∪ (𝐷 × {{∅}})) → 𝐵 = 𝐷)
5626, 55jca 294 . 2 (((𝐴 × {∅}) ∪ (𝐵 × {{∅}})) = ((𝐶 × {∅}) ∪ (𝐷 × {{∅}})) → (𝐴 = 𝐶𝐵 = 𝐷))
57 xpeq1 4386 . . 3 (𝐴 = 𝐶 → (𝐴 × {∅}) = (𝐶 × {∅}))
58 xpeq1 4386 . . 3 (𝐵 = 𝐷 → (𝐵 × {{∅}}) = (𝐷 × {{∅}}))
59 uneq12 3119 . . 3 (((𝐴 × {∅}) = (𝐶 × {∅}) ∧ (𝐵 × {{∅}}) = (𝐷 × {{∅}})) → ((𝐴 × {∅}) ∪ (𝐵 × {{∅}})) = ((𝐶 × {∅}) ∪ (𝐷 × {{∅}})))
6057, 58, 59syl2an 277 . 2 ((𝐴 = 𝐶𝐵 = 𝐷) → ((𝐴 × {∅}) ∪ (𝐵 × {{∅}})) = ((𝐶 × {∅}) ∪ (𝐷 × {{∅}})))
6156, 60impbii 121 1 (((𝐴 × {∅}) ∪ (𝐵 × {{∅}})) = ((𝐶 × {∅}) ∪ (𝐷 × {{∅}})) ↔ (𝐴 = 𝐶𝐵 = 𝐷))
Colors of variables: wff set class
Syntax hints:  ¬ wn 3  wa 101  wb 102  wo 639   = wceq 1259  wcel 1409  cun 2942  c0 3251  {csn 3402  cop 3405   × cxp 4370
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 103  ax-ia2 104  ax-ia3 105  ax-in1 554  ax-in2 555  ax-io 640  ax-5 1352  ax-7 1353  ax-gen 1354  ax-ie1 1398  ax-ie2 1399  ax-8 1411  ax-10 1412  ax-11 1413  ax-i12 1414  ax-bndl 1415  ax-4 1416  ax-14 1421  ax-17 1435  ax-i9 1439  ax-ial 1443  ax-i5r 1444  ax-ext 2038  ax-sep 3902  ax-nul 3910  ax-pow 3954  ax-pr 3971
This theorem depends on definitions:  df-bi 114  df-3an 898  df-tru 1262  df-nf 1366  df-sb 1662  df-clab 2043  df-cleq 2049  df-clel 2052  df-nfc 2183  df-ne 2221  df-ral 2328  df-rex 2329  df-v 2576  df-dif 2947  df-un 2949  df-in 2951  df-ss 2958  df-nul 3252  df-pw 3388  df-sn 3408  df-pr 3409  df-op 3411  df-opab 3846  df-xp 4378
This theorem is referenced by: (None)
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