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Theorem sorpssint 6989
Description: In a chain of sets, a minimal element is the intersection of the chain. (Contributed by Stefan O'Rear, 2-Nov-2014.)
Assertion
Ref Expression
sorpssint ( [] Or 𝑌 → (∃𝑢𝑌𝑣𝑌 ¬ 𝑣𝑢 𝑌𝑌))
Distinct variable group:   𝑢,𝑌,𝑣

Proof of Theorem sorpssint
StepHypRef Expression
1 intss1 4524 . . . . . 6 (𝑢𝑌 𝑌𝑢)
213ad2ant2 1103 . . . . 5 (( [] Or 𝑌𝑢𝑌 ∧ ∀𝑣𝑌 ¬ 𝑣𝑢) → 𝑌𝑢)
3 sorpssi 6985 . . . . . . . . . 10 (( [] Or 𝑌 ∧ (𝑢𝑌𝑣𝑌)) → (𝑢𝑣𝑣𝑢))
43anassrs 681 . . . . . . . . 9 ((( [] Or 𝑌𝑢𝑌) ∧ 𝑣𝑌) → (𝑢𝑣𝑣𝑢))
5 ax-1 6 . . . . . . . . . 10 (𝑢𝑣 → (¬ 𝑣𝑢𝑢𝑣))
6 sspss 3739 . . . . . . . . . . 11 (𝑣𝑢 ↔ (𝑣𝑢𝑣 = 𝑢))
7 orel1 396 . . . . . . . . . . . 12 𝑣𝑢 → ((𝑣𝑢𝑣 = 𝑢) → 𝑣 = 𝑢))
8 eqimss2 3691 . . . . . . . . . . . 12 (𝑣 = 𝑢𝑢𝑣)
97, 8syl6com 37 . . . . . . . . . . 11 ((𝑣𝑢𝑣 = 𝑢) → (¬ 𝑣𝑢𝑢𝑣))
106, 9sylbi 207 . . . . . . . . . 10 (𝑣𝑢 → (¬ 𝑣𝑢𝑢𝑣))
115, 10jaoi 393 . . . . . . . . 9 ((𝑢𝑣𝑣𝑢) → (¬ 𝑣𝑢𝑢𝑣))
124, 11syl 17 . . . . . . . 8 ((( [] Or 𝑌𝑢𝑌) ∧ 𝑣𝑌) → (¬ 𝑣𝑢𝑢𝑣))
1312ralimdva 2991 . . . . . . 7 (( [] Or 𝑌𝑢𝑌) → (∀𝑣𝑌 ¬ 𝑣𝑢 → ∀𝑣𝑌 𝑢𝑣))
14133impia 1280 . . . . . 6 (( [] Or 𝑌𝑢𝑌 ∧ ∀𝑣𝑌 ¬ 𝑣𝑢) → ∀𝑣𝑌 𝑢𝑣)
15 ssint 4525 . . . . . 6 (𝑢 𝑌 ↔ ∀𝑣𝑌 𝑢𝑣)
1614, 15sylibr 224 . . . . 5 (( [] Or 𝑌𝑢𝑌 ∧ ∀𝑣𝑌 ¬ 𝑣𝑢) → 𝑢 𝑌)
172, 16eqssd 3653 . . . 4 (( [] Or 𝑌𝑢𝑌 ∧ ∀𝑣𝑌 ¬ 𝑣𝑢) → 𝑌 = 𝑢)
18 simp2 1082 . . . 4 (( [] Or 𝑌𝑢𝑌 ∧ ∀𝑣𝑌 ¬ 𝑣𝑢) → 𝑢𝑌)
1917, 18eqeltrd 2730 . . 3 (( [] Or 𝑌𝑢𝑌 ∧ ∀𝑣𝑌 ¬ 𝑣𝑢) → 𝑌𝑌)
2019rexlimdv3a 3062 . 2 ( [] Or 𝑌 → (∃𝑢𝑌𝑣𝑌 ¬ 𝑣𝑢 𝑌𝑌))
21 intss1 4524 . . . . 5 (𝑣𝑌 𝑌𝑣)
22 ssnpss 3743 . . . . 5 ( 𝑌𝑣 → ¬ 𝑣 𝑌)
2321, 22syl 17 . . . 4 (𝑣𝑌 → ¬ 𝑣 𝑌)
2423rgen 2951 . . 3 𝑣𝑌 ¬ 𝑣 𝑌
25 psseq2 3728 . . . . . 6 (𝑢 = 𝑌 → (𝑣𝑢𝑣 𝑌))
2625notbid 307 . . . . 5 (𝑢 = 𝑌 → (¬ 𝑣𝑢 ↔ ¬ 𝑣 𝑌))
2726ralbidv 3015 . . . 4 (𝑢 = 𝑌 → (∀𝑣𝑌 ¬ 𝑣𝑢 ↔ ∀𝑣𝑌 ¬ 𝑣 𝑌))
2827rspcev 3340 . . 3 (( 𝑌𝑌 ∧ ∀𝑣𝑌 ¬ 𝑣 𝑌) → ∃𝑢𝑌𝑣𝑌 ¬ 𝑣𝑢)
2924, 28mpan2 707 . 2 ( 𝑌𝑌 → ∃𝑢𝑌𝑣𝑌 ¬ 𝑣𝑢)
3020, 29impbid1 215 1 ( [] Or 𝑌 → (∃𝑢𝑌𝑣𝑌 ¬ 𝑣𝑢 𝑌𝑌))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 196  wo 382  wa 383  w3a 1054   = wceq 1523  wcel 2030  wral 2941  wrex 2942  wss 3607  wpss 3608   cint 4507   Or wor 5063   [] crpss 6978
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-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-pss 3623  df-nul 3949  df-if 4120  df-sn 4211  df-pr 4213  df-op 4217  df-int 4508  df-br 4686  df-opab 4746  df-so 5065  df-xp 5149  df-rel 5150  df-rpss 6979
This theorem is referenced by:  fin2i2  9178  isfin2-2  9179
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