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Theorem ust0 22745
Description: The unique uniform structure of the empty set is the empty set. Remark 3 of [BourbakiTop1] p. II.2. (Contributed by Thierry Arnoux, 15-Nov-2017.)
Assertion
Ref Expression
ust0 (UnifOn‘∅) = {{∅}}

Proof of Theorem ust0
Dummy variables 𝑣 𝑢 𝑤 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 0ex 5207 . . . . . . . 8 ∅ ∈ V
2 isust 22729 . . . . . . . 8 (∅ ∈ V → (𝑢 ∈ (UnifOn‘∅) ↔ (𝑢 ⊆ 𝒫 (∅ × ∅) ∧ (∅ × ∅) ∈ 𝑢 ∧ ∀𝑣𝑢 (∀𝑤 ∈ 𝒫 (∅ × ∅)(𝑣𝑤𝑤𝑢) ∧ ∀𝑤𝑢 (𝑣𝑤) ∈ 𝑢 ∧ (( I ↾ ∅) ⊆ 𝑣𝑣𝑢 ∧ ∃𝑤𝑢 (𝑤𝑤) ⊆ 𝑣)))))
31, 2ax-mp 5 . . . . . . 7 (𝑢 ∈ (UnifOn‘∅) ↔ (𝑢 ⊆ 𝒫 (∅ × ∅) ∧ (∅ × ∅) ∈ 𝑢 ∧ ∀𝑣𝑢 (∀𝑤 ∈ 𝒫 (∅ × ∅)(𝑣𝑤𝑤𝑢) ∧ ∀𝑤𝑢 (𝑣𝑤) ∈ 𝑢 ∧ (( I ↾ ∅) ⊆ 𝑣𝑣𝑢 ∧ ∃𝑤𝑢 (𝑤𝑤) ⊆ 𝑣))))
43simp1bi 1139 . . . . . 6 (𝑢 ∈ (UnifOn‘∅) → 𝑢 ⊆ 𝒫 (∅ × ∅))
5 0xp 5647 . . . . . . . 8 (∅ × ∅) = ∅
65pweqi 4545 . . . . . . 7 𝒫 (∅ × ∅) = 𝒫 ∅
7 pw0 4743 . . . . . . 7 𝒫 ∅ = {∅}
86, 7eqtri 2848 . . . . . 6 𝒫 (∅ × ∅) = {∅}
94, 8syl6sseq 4020 . . . . 5 (𝑢 ∈ (UnifOn‘∅) → 𝑢 ⊆ {∅})
10 ustbasel 22732 . . . . . . 7 (𝑢 ∈ (UnifOn‘∅) → (∅ × ∅) ∈ 𝑢)
115, 10eqeltrrid 2922 . . . . . 6 (𝑢 ∈ (UnifOn‘∅) → ∅ ∈ 𝑢)
1211snssd 4740 . . . . 5 (𝑢 ∈ (UnifOn‘∅) → {∅} ⊆ 𝑢)
139, 12eqssd 3987 . . . 4 (𝑢 ∈ (UnifOn‘∅) → 𝑢 = {∅})
14 velsn 4579 . . . 4 (𝑢 ∈ {{∅}} ↔ 𝑢 = {∅})
1513, 14sylibr 235 . . 3 (𝑢 ∈ (UnifOn‘∅) → 𝑢 ∈ {{∅}})
1615ssriv 3974 . 2 (UnifOn‘∅) ⊆ {{∅}}
178eqimss2i 4029 . . . 4 {∅} ⊆ 𝒫 (∅ × ∅)
181snid 4597 . . . . 5 ∅ ∈ {∅}
195, 18eqeltri 2913 . . . 4 (∅ × ∅) ∈ {∅}
2018a1i 11 . . . . . 6 (∅ ⊆ ∅ → ∅ ∈ {∅})
218raleqi 3418 . . . . . . 7 (∀𝑤 ∈ 𝒫 (∅ × ∅)(∅ ⊆ 𝑤𝑤 ∈ {∅}) ↔ ∀𝑤 ∈ {∅} (∅ ⊆ 𝑤𝑤 ∈ {∅}))
22 sseq2 3996 . . . . . . . . 9 (𝑤 = ∅ → (∅ ⊆ 𝑤 ↔ ∅ ⊆ ∅))
23 eleq1 2904 . . . . . . . . 9 (𝑤 = ∅ → (𝑤 ∈ {∅} ↔ ∅ ∈ {∅}))
2422, 23imbi12d 346 . . . . . . . 8 (𝑤 = ∅ → ((∅ ⊆ 𝑤𝑤 ∈ {∅}) ↔ (∅ ⊆ ∅ → ∅ ∈ {∅})))
251, 24ralsn 4617 . . . . . . 7 (∀𝑤 ∈ {∅} (∅ ⊆ 𝑤𝑤 ∈ {∅}) ↔ (∅ ⊆ ∅ → ∅ ∈ {∅}))
2621, 25bitri 276 . . . . . 6 (∀𝑤 ∈ 𝒫 (∅ × ∅)(∅ ⊆ 𝑤𝑤 ∈ {∅}) ↔ (∅ ⊆ ∅ → ∅ ∈ {∅}))
2720, 26mpbir 232 . . . . 5 𝑤 ∈ 𝒫 (∅ × ∅)(∅ ⊆ 𝑤𝑤 ∈ {∅})
28 inidm 4198 . . . . . . 7 (∅ ∩ ∅) = ∅
2928, 18eqeltri 2913 . . . . . 6 (∅ ∩ ∅) ∈ {∅}
30 ineq2 4186 . . . . . . . 8 (𝑤 = ∅ → (∅ ∩ 𝑤) = (∅ ∩ ∅))
3130eleq1d 2901 . . . . . . 7 (𝑤 = ∅ → ((∅ ∩ 𝑤) ∈ {∅} ↔ (∅ ∩ ∅) ∈ {∅}))
321, 31ralsn 4617 . . . . . 6 (∀𝑤 ∈ {∅} (∅ ∩ 𝑤) ∈ {∅} ↔ (∅ ∩ ∅) ∈ {∅})
3329, 32mpbir 232 . . . . 5 𝑤 ∈ {∅} (∅ ∩ 𝑤) ∈ {∅}
34 res0 5855 . . . . . . 7 ( I ↾ ∅) = ∅
3534eqimssi 4028 . . . . . 6 ( I ↾ ∅) ⊆ ∅
36 cnv0 5996 . . . . . . 7 ∅ = ∅
3736, 18eqeltri 2913 . . . . . 6 ∅ ∈ {∅}
38 0trrel 14334 . . . . . . 7 (∅ ∘ ∅) ⊆ ∅
39 id 22 . . . . . . . . . 10 (𝑤 = ∅ → 𝑤 = ∅)
4039, 39coeq12d 5733 . . . . . . . . 9 (𝑤 = ∅ → (𝑤𝑤) = (∅ ∘ ∅))
4140sseq1d 4001 . . . . . . . 8 (𝑤 = ∅ → ((𝑤𝑤) ⊆ ∅ ↔ (∅ ∘ ∅) ⊆ ∅))
421, 41rexsn 4618 . . . . . . 7 (∃𝑤 ∈ {∅} (𝑤𝑤) ⊆ ∅ ↔ (∅ ∘ ∅) ⊆ ∅)
4338, 42mpbir 232 . . . . . 6 𝑤 ∈ {∅} (𝑤𝑤) ⊆ ∅
4435, 37, 433pm3.2i 1333 . . . . 5 (( I ↾ ∅) ⊆ ∅ ∧ ∅ ∈ {∅} ∧ ∃𝑤 ∈ {∅} (𝑤𝑤) ⊆ ∅)
45 sseq1 3995 . . . . . . . . 9 (𝑣 = ∅ → (𝑣𝑤 ↔ ∅ ⊆ 𝑤))
4645imbi1d 343 . . . . . . . 8 (𝑣 = ∅ → ((𝑣𝑤𝑤 ∈ {∅}) ↔ (∅ ⊆ 𝑤𝑤 ∈ {∅})))
4746ralbidv 3201 . . . . . . 7 (𝑣 = ∅ → (∀𝑤 ∈ 𝒫 (∅ × ∅)(𝑣𝑤𝑤 ∈ {∅}) ↔ ∀𝑤 ∈ 𝒫 (∅ × ∅)(∅ ⊆ 𝑤𝑤 ∈ {∅})))
48 ineq1 4184 . . . . . . . . 9 (𝑣 = ∅ → (𝑣𝑤) = (∅ ∩ 𝑤))
4948eleq1d 2901 . . . . . . . 8 (𝑣 = ∅ → ((𝑣𝑤) ∈ {∅} ↔ (∅ ∩ 𝑤) ∈ {∅}))
5049ralbidv 3201 . . . . . . 7 (𝑣 = ∅ → (∀𝑤 ∈ {∅} (𝑣𝑤) ∈ {∅} ↔ ∀𝑤 ∈ {∅} (∅ ∩ 𝑤) ∈ {∅}))
51 sseq2 3996 . . . . . . . 8 (𝑣 = ∅ → (( I ↾ ∅) ⊆ 𝑣 ↔ ( I ↾ ∅) ⊆ ∅))
52 cnveq 5742 . . . . . . . . 9 (𝑣 = ∅ → 𝑣 = ∅)
5352eleq1d 2901 . . . . . . . 8 (𝑣 = ∅ → (𝑣 ∈ {∅} ↔ ∅ ∈ {∅}))
54 sseq2 3996 . . . . . . . . 9 (𝑣 = ∅ → ((𝑤𝑤) ⊆ 𝑣 ↔ (𝑤𝑤) ⊆ ∅))
5554rexbidv 3301 . . . . . . . 8 (𝑣 = ∅ → (∃𝑤 ∈ {∅} (𝑤𝑤) ⊆ 𝑣 ↔ ∃𝑤 ∈ {∅} (𝑤𝑤) ⊆ ∅))
5651, 53, 553anbi123d 1429 . . . . . . 7 (𝑣 = ∅ → ((( I ↾ ∅) ⊆ 𝑣𝑣 ∈ {∅} ∧ ∃𝑤 ∈ {∅} (𝑤𝑤) ⊆ 𝑣) ↔ (( I ↾ ∅) ⊆ ∅ ∧ ∅ ∈ {∅} ∧ ∃𝑤 ∈ {∅} (𝑤𝑤) ⊆ ∅)))
5747, 50, 563anbi123d 1429 . . . . . 6 (𝑣 = ∅ → ((∀𝑤 ∈ 𝒫 (∅ × ∅)(𝑣𝑤𝑤 ∈ {∅}) ∧ ∀𝑤 ∈ {∅} (𝑣𝑤) ∈ {∅} ∧ (( I ↾ ∅) ⊆ 𝑣𝑣 ∈ {∅} ∧ ∃𝑤 ∈ {∅} (𝑤𝑤) ⊆ 𝑣)) ↔ (∀𝑤 ∈ 𝒫 (∅ × ∅)(∅ ⊆ 𝑤𝑤 ∈ {∅}) ∧ ∀𝑤 ∈ {∅} (∅ ∩ 𝑤) ∈ {∅} ∧ (( I ↾ ∅) ⊆ ∅ ∧ ∅ ∈ {∅} ∧ ∃𝑤 ∈ {∅} (𝑤𝑤) ⊆ ∅))))
581, 57ralsn 4617 . . . . 5 (∀𝑣 ∈ {∅} (∀𝑤 ∈ 𝒫 (∅ × ∅)(𝑣𝑤𝑤 ∈ {∅}) ∧ ∀𝑤 ∈ {∅} (𝑣𝑤) ∈ {∅} ∧ (( I ↾ ∅) ⊆ 𝑣𝑣 ∈ {∅} ∧ ∃𝑤 ∈ {∅} (𝑤𝑤) ⊆ 𝑣)) ↔ (∀𝑤 ∈ 𝒫 (∅ × ∅)(∅ ⊆ 𝑤𝑤 ∈ {∅}) ∧ ∀𝑤 ∈ {∅} (∅ ∩ 𝑤) ∈ {∅} ∧ (( I ↾ ∅) ⊆ ∅ ∧ ∅ ∈ {∅} ∧ ∃𝑤 ∈ {∅} (𝑤𝑤) ⊆ ∅)))
5927, 33, 44, 58mpbir3an 1335 . . . 4 𝑣 ∈ {∅} (∀𝑤 ∈ 𝒫 (∅ × ∅)(𝑣𝑤𝑤 ∈ {∅}) ∧ ∀𝑤 ∈ {∅} (𝑣𝑤) ∈ {∅} ∧ (( I ↾ ∅) ⊆ 𝑣𝑣 ∈ {∅} ∧ ∃𝑤 ∈ {∅} (𝑤𝑤) ⊆ 𝑣))
60 isust 22729 . . . . 5 (∅ ∈ V → ({∅} ∈ (UnifOn‘∅) ↔ ({∅} ⊆ 𝒫 (∅ × ∅) ∧ (∅ × ∅) ∈ {∅} ∧ ∀𝑣 ∈ {∅} (∀𝑤 ∈ 𝒫 (∅ × ∅)(𝑣𝑤𝑤 ∈ {∅}) ∧ ∀𝑤 ∈ {∅} (𝑣𝑤) ∈ {∅} ∧ (( I ↾ ∅) ⊆ 𝑣𝑣 ∈ {∅} ∧ ∃𝑤 ∈ {∅} (𝑤𝑤) ⊆ 𝑣)))))
611, 60ax-mp 5 . . . 4 ({∅} ∈ (UnifOn‘∅) ↔ ({∅} ⊆ 𝒫 (∅ × ∅) ∧ (∅ × ∅) ∈ {∅} ∧ ∀𝑣 ∈ {∅} (∀𝑤 ∈ 𝒫 (∅ × ∅)(𝑣𝑤𝑤 ∈ {∅}) ∧ ∀𝑤 ∈ {∅} (𝑣𝑤) ∈ {∅} ∧ (( I ↾ ∅) ⊆ 𝑣𝑣 ∈ {∅} ∧ ∃𝑤 ∈ {∅} (𝑤𝑤) ⊆ 𝑣))))
6217, 19, 59, 61mpbir3an 1335 . . 3 {∅} ∈ (UnifOn‘∅)
63 snssi 4739 . . 3 ({∅} ∈ (UnifOn‘∅) → {{∅}} ⊆ (UnifOn‘∅))
6462, 63ax-mp 5 . 2 {{∅}} ⊆ (UnifOn‘∅)
6516, 64eqssi 3986 1 (UnifOn‘∅) = {{∅}}
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 207  w3a 1081   = wceq 1530  wcel 2107  wral 3142  wrex 3143  Vcvv 3499  cin 3938  wss 3939  c0 4294  𝒫 cpw 4541  {csn 4563   I cid 5457   × cxp 5551  ccnv 5552  cres 5555  ccom 5557  cfv 6351  UnifOncust 22725
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1904  ax-6 1963  ax-7 2008  ax-8 2109  ax-9 2117  ax-10 2138  ax-11 2153  ax-12 2169  ax-ext 2797  ax-sep 5199  ax-nul 5206  ax-pow 5262  ax-pr 5325  ax-un 7454
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 844  df-3an 1083  df-tru 1533  df-ex 1774  df-nf 1778  df-sb 2063  df-mo 2619  df-eu 2651  df-clab 2804  df-cleq 2818  df-clel 2897  df-nfc 2967  df-ral 3147  df-rex 3148  df-rab 3151  df-v 3501  df-sbc 3776  df-dif 3942  df-un 3944  df-in 3946  df-ss 3955  df-nul 4295  df-if 4470  df-pw 4543  df-sn 4564  df-pr 4566  df-op 4570  df-uni 4837  df-br 5063  df-opab 5125  df-mpt 5143  df-id 5458  df-xp 5559  df-rel 5560  df-cnv 5561  df-co 5562  df-dm 5563  df-res 5565  df-iota 6311  df-fun 6353  df-fv 6359  df-ust 22726
This theorem is referenced by:  isusp  22787
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