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Theorem soex 7151
Description: If the relation in a strict order is a set, then the base field is also a set. (Contributed by Mario Carneiro, 27-Apr-2015.)
Assertion
Ref Expression
soex ((𝑅 Or 𝐴𝑅𝑉) → 𝐴 ∈ V)

Proof of Theorem soex
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 simpr 476 . . 3 (((𝑅 Or 𝐴𝑅𝑉) ∧ 𝐴 = ∅) → 𝐴 = ∅)
2 0ex 4823 . . 3 ∅ ∈ V
31, 2syl6eqel 2738 . 2 (((𝑅 Or 𝐴𝑅𝑉) ∧ 𝐴 = ∅) → 𝐴 ∈ V)
4 n0 3964 . . 3 (𝐴 ≠ ∅ ↔ ∃𝑥 𝑥𝐴)
5 snex 4938 . . . . . . . . 9 {𝑥} ∈ V
6 dmexg 7139 . . . . . . . . . 10 (𝑅𝑉 → dom 𝑅 ∈ V)
7 rnexg 7140 . . . . . . . . . 10 (𝑅𝑉 → ran 𝑅 ∈ V)
8 unexg 7001 . . . . . . . . . 10 ((dom 𝑅 ∈ V ∧ ran 𝑅 ∈ V) → (dom 𝑅 ∪ ran 𝑅) ∈ V)
96, 7, 8syl2anc 694 . . . . . . . . 9 (𝑅𝑉 → (dom 𝑅 ∪ ran 𝑅) ∈ V)
10 unexg 7001 . . . . . . . . 9 (({𝑥} ∈ V ∧ (dom 𝑅 ∪ ran 𝑅) ∈ V) → ({𝑥} ∪ (dom 𝑅 ∪ ran 𝑅)) ∈ V)
115, 9, 10sylancr 696 . . . . . . . 8 (𝑅𝑉 → ({𝑥} ∪ (dom 𝑅 ∪ ran 𝑅)) ∈ V)
1211ad2antlr 763 . . . . . . 7 (((𝑅 Or 𝐴𝑅𝑉) ∧ 𝑥𝐴) → ({𝑥} ∪ (dom 𝑅 ∪ ran 𝑅)) ∈ V)
13 sossfld 5615 . . . . . . . . 9 ((𝑅 Or 𝐴𝑥𝐴) → (𝐴 ∖ {𝑥}) ⊆ (dom 𝑅 ∪ ran 𝑅))
1413adantlr 751 . . . . . . . 8 (((𝑅 Or 𝐴𝑅𝑉) ∧ 𝑥𝐴) → (𝐴 ∖ {𝑥}) ⊆ (dom 𝑅 ∪ ran 𝑅))
15 ssundif 4085 . . . . . . . 8 (𝐴 ⊆ ({𝑥} ∪ (dom 𝑅 ∪ ran 𝑅)) ↔ (𝐴 ∖ {𝑥}) ⊆ (dom 𝑅 ∪ ran 𝑅))
1614, 15sylibr 224 . . . . . . 7 (((𝑅 Or 𝐴𝑅𝑉) ∧ 𝑥𝐴) → 𝐴 ⊆ ({𝑥} ∪ (dom 𝑅 ∪ ran 𝑅)))
1712, 16ssexd 4838 . . . . . 6 (((𝑅 Or 𝐴𝑅𝑉) ∧ 𝑥𝐴) → 𝐴 ∈ V)
1817ex 449 . . . . 5 ((𝑅 Or 𝐴𝑅𝑉) → (𝑥𝐴𝐴 ∈ V))
1918exlimdv 1901 . . . 4 ((𝑅 Or 𝐴𝑅𝑉) → (∃𝑥 𝑥𝐴𝐴 ∈ V))
2019imp 444 . . 3 (((𝑅 Or 𝐴𝑅𝑉) ∧ ∃𝑥 𝑥𝐴) → 𝐴 ∈ V)
214, 20sylan2b 491 . 2 (((𝑅 Or 𝐴𝑅𝑉) ∧ 𝐴 ≠ ∅) → 𝐴 ∈ V)
223, 21pm2.61dane 2910 1 ((𝑅 Or 𝐴𝑅𝑉) → 𝐴 ∈ V)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 383   = wceq 1523  wex 1744  wcel 2030  wne 2823  Vcvv 3231  cdif 3604  cun 3605  wss 3607  c0 3948  {csn 4210   Or wor 5063  dom cdm 5143  ran crn 5144
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-8 2032  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  ax-un 6991
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3or 1055  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-uni 4469  df-br 4686  df-opab 4746  df-po 5064  df-so 5065  df-cnv 5151  df-dm 5153  df-rn 5154
This theorem is referenced by:  ween  8896  zorn2lem1  9356  zorn2lem4  9359
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