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Theorem ust0 22070
 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 4823 . . . . . . . 8 ∅ ∈ V
2 isust 22054 . . . . . . . 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 1096 . . . . . 6 (𝑢 ∈ (UnifOn‘∅) → 𝑢 ⊆ 𝒫 (∅ × ∅))
5 0xp 5233 . . . . . . . 8 (∅ × ∅) = ∅
65pweqi 4195 . . . . . . 7 𝒫 (∅ × ∅) = 𝒫 ∅
7 pw0 4375 . . . . . . 7 𝒫 ∅ = {∅}
86, 7eqtri 2673 . . . . . 6 𝒫 (∅ × ∅) = {∅}
94, 8syl6sseq 3684 . . . . 5 (𝑢 ∈ (UnifOn‘∅) → 𝑢 ⊆ {∅})
10 ustbasel 22057 . . . . . . 7 (𝑢 ∈ (UnifOn‘∅) → (∅ × ∅) ∈ 𝑢)
115, 10syl5eqelr 2735 . . . . . 6 (𝑢 ∈ (UnifOn‘∅) → ∅ ∈ 𝑢)
1211snssd 4372 . . . . 5 (𝑢 ∈ (UnifOn‘∅) → {∅} ⊆ 𝑢)
139, 12eqssd 3653 . . . 4 (𝑢 ∈ (UnifOn‘∅) → 𝑢 = {∅})
14 velsn 4226 . . . 4 (𝑢 ∈ {{∅}} ↔ 𝑢 = {∅})
1513, 14sylibr 224 . . 3 (𝑢 ∈ (UnifOn‘∅) → 𝑢 ∈ {{∅}})
1615ssriv 3640 . 2 (UnifOn‘∅) ⊆ {{∅}}
178eqimss2i 3693 . . . 4 {∅} ⊆ 𝒫 (∅ × ∅)
181snid 4241 . . . . 5 ∅ ∈ {∅}
195, 18eqeltri 2726 . . . 4 (∅ × ∅) ∈ {∅}
2018a1i 11 . . . . . 6 (∅ ⊆ ∅ → ∅ ∈ {∅})
218raleqi 3172 . . . . . . 7 (∀𝑤 ∈ 𝒫 (∅ × ∅)(∅ ⊆ 𝑤𝑤 ∈ {∅}) ↔ ∀𝑤 ∈ {∅} (∅ ⊆ 𝑤𝑤 ∈ {∅}))
22 sseq2 3660 . . . . . . . . 9 (𝑤 = ∅ → (∅ ⊆ 𝑤 ↔ ∅ ⊆ ∅))
23 eleq1 2718 . . . . . . . . 9 (𝑤 = ∅ → (𝑤 ∈ {∅} ↔ ∅ ∈ {∅}))
2422, 23imbi12d 333 . . . . . . . 8 (𝑤 = ∅ → ((∅ ⊆ 𝑤𝑤 ∈ {∅}) ↔ (∅ ⊆ ∅ → ∅ ∈ {∅})))
251, 24ralsn 4254 . . . . . . 7 (∀𝑤 ∈ {∅} (∅ ⊆ 𝑤𝑤 ∈ {∅}) ↔ (∅ ⊆ ∅ → ∅ ∈ {∅}))
2621, 25bitri 264 . . . . . 6 (∀𝑤 ∈ 𝒫 (∅ × ∅)(∅ ⊆ 𝑤𝑤 ∈ {∅}) ↔ (∅ ⊆ ∅ → ∅ ∈ {∅}))
2720, 26mpbir 221 . . . . 5 𝑤 ∈ 𝒫 (∅ × ∅)(∅ ⊆ 𝑤𝑤 ∈ {∅})
28 inidm 3855 . . . . . . 7 (∅ ∩ ∅) = ∅
2928, 18eqeltri 2726 . . . . . 6 (∅ ∩ ∅) ∈ {∅}
30 ineq2 3841 . . . . . . . 8 (𝑤 = ∅ → (∅ ∩ 𝑤) = (∅ ∩ ∅))
3130eleq1d 2715 . . . . . . 7 (𝑤 = ∅ → ((∅ ∩ 𝑤) ∈ {∅} ↔ (∅ ∩ ∅) ∈ {∅}))
321, 31ralsn 4254 . . . . . 6 (∀𝑤 ∈ {∅} (∅ ∩ 𝑤) ∈ {∅} ↔ (∅ ∩ ∅) ∈ {∅})
3329, 32mpbir 221 . . . . 5 𝑤 ∈ {∅} (∅ ∩ 𝑤) ∈ {∅}
34 res0 5432 . . . . . . 7 ( I ↾ ∅) = ∅
3534eqimssi 3692 . . . . . 6 ( I ↾ ∅) ⊆ ∅
36 cnv0 5570 . . . . . . 7 ∅ = ∅
3736, 18eqeltri 2726 . . . . . 6 ∅ ∈ {∅}
38 0trrel 13766 . . . . . . 7 (∅ ∘ ∅) ⊆ ∅
39 id 22 . . . . . . . . . 10 (𝑤 = ∅ → 𝑤 = ∅)
4039, 39coeq12d 5319 . . . . . . . . 9 (𝑤 = ∅ → (𝑤𝑤) = (∅ ∘ ∅))
4140sseq1d 3665 . . . . . . . 8 (𝑤 = ∅ → ((𝑤𝑤) ⊆ ∅ ↔ (∅ ∘ ∅) ⊆ ∅))
421, 41rexsn 4255 . . . . . . 7 (∃𝑤 ∈ {∅} (𝑤𝑤) ⊆ ∅ ↔ (∅ ∘ ∅) ⊆ ∅)
4338, 42mpbir 221 . . . . . 6 𝑤 ∈ {∅} (𝑤𝑤) ⊆ ∅
4435, 37, 433pm3.2i 1259 . . . . 5 (( I ↾ ∅) ⊆ ∅ ∧ ∅ ∈ {∅} ∧ ∃𝑤 ∈ {∅} (𝑤𝑤) ⊆ ∅)
45 sseq1 3659 . . . . . . . . 9 (𝑣 = ∅ → (𝑣𝑤 ↔ ∅ ⊆ 𝑤))
4645imbi1d 330 . . . . . . . 8 (𝑣 = ∅ → ((𝑣𝑤𝑤 ∈ {∅}) ↔ (∅ ⊆ 𝑤𝑤 ∈ {∅})))
4746ralbidv 3015 . . . . . . 7 (𝑣 = ∅ → (∀𝑤 ∈ 𝒫 (∅ × ∅)(𝑣𝑤𝑤 ∈ {∅}) ↔ ∀𝑤 ∈ 𝒫 (∅ × ∅)(∅ ⊆ 𝑤𝑤 ∈ {∅})))
48 ineq1 3840 . . . . . . . . 9 (𝑣 = ∅ → (𝑣𝑤) = (∅ ∩ 𝑤))
4948eleq1d 2715 . . . . . . . 8 (𝑣 = ∅ → ((𝑣𝑤) ∈ {∅} ↔ (∅ ∩ 𝑤) ∈ {∅}))
5049ralbidv 3015 . . . . . . 7 (𝑣 = ∅ → (∀𝑤 ∈ {∅} (𝑣𝑤) ∈ {∅} ↔ ∀𝑤 ∈ {∅} (∅ ∩ 𝑤) ∈ {∅}))
51 sseq2 3660 . . . . . . . 8 (𝑣 = ∅ → (( I ↾ ∅) ⊆ 𝑣 ↔ ( I ↾ ∅) ⊆ ∅))
52 cnveq 5328 . . . . . . . . 9 (𝑣 = ∅ → 𝑣 = ∅)
5352eleq1d 2715 . . . . . . . 8 (𝑣 = ∅ → (𝑣 ∈ {∅} ↔ ∅ ∈ {∅}))
54 sseq2 3660 . . . . . . . . 9 (𝑣 = ∅ → ((𝑤𝑤) ⊆ 𝑣 ↔ (𝑤𝑤) ⊆ ∅))
5554rexbidv 3081 . . . . . . . 8 (𝑣 = ∅ → (∃𝑤 ∈ {∅} (𝑤𝑤) ⊆ 𝑣 ↔ ∃𝑤 ∈ {∅} (𝑤𝑤) ⊆ ∅))
5651, 53, 553anbi123d 1439 . . . . . . 7 (𝑣 = ∅ → ((( I ↾ ∅) ⊆ 𝑣𝑣 ∈ {∅} ∧ ∃𝑤 ∈ {∅} (𝑤𝑤) ⊆ 𝑣) ↔ (( I ↾ ∅) ⊆ ∅ ∧ ∅ ∈ {∅} ∧ ∃𝑤 ∈ {∅} (𝑤𝑤) ⊆ ∅)))
5747, 50, 563anbi123d 1439 . . . . . 6 (𝑣 = ∅ → ((∀𝑤 ∈ 𝒫 (∅ × ∅)(𝑣𝑤𝑤 ∈ {∅}) ∧ ∀𝑤 ∈ {∅} (𝑣𝑤) ∈ {∅} ∧ (( I ↾ ∅) ⊆ 𝑣𝑣 ∈ {∅} ∧ ∃𝑤 ∈ {∅} (𝑤𝑤) ⊆ 𝑣)) ↔ (∀𝑤 ∈ 𝒫 (∅ × ∅)(∅ ⊆ 𝑤𝑤 ∈ {∅}) ∧ ∀𝑤 ∈ {∅} (∅ ∩ 𝑤) ∈ {∅} ∧ (( I ↾ ∅) ⊆ ∅ ∧ ∅ ∈ {∅} ∧ ∃𝑤 ∈ {∅} (𝑤𝑤) ⊆ ∅))))
581, 57ralsn 4254 . . . . 5 (∀𝑣 ∈ {∅} (∀𝑤 ∈ 𝒫 (∅ × ∅)(𝑣𝑤𝑤 ∈ {∅}) ∧ ∀𝑤 ∈ {∅} (𝑣𝑤) ∈ {∅} ∧ (( I ↾ ∅) ⊆ 𝑣𝑣 ∈ {∅} ∧ ∃𝑤 ∈ {∅} (𝑤𝑤) ⊆ 𝑣)) ↔ (∀𝑤 ∈ 𝒫 (∅ × ∅)(∅ ⊆ 𝑤𝑤 ∈ {∅}) ∧ ∀𝑤 ∈ {∅} (∅ ∩ 𝑤) ∈ {∅} ∧ (( I ↾ ∅) ⊆ ∅ ∧ ∅ ∈ {∅} ∧ ∃𝑤 ∈ {∅} (𝑤𝑤) ⊆ ∅)))
5927, 33, 44, 58mpbir3an 1263 . . . 4 𝑣 ∈ {∅} (∀𝑤 ∈ 𝒫 (∅ × ∅)(𝑣𝑤𝑤 ∈ {∅}) ∧ ∀𝑤 ∈ {∅} (𝑣𝑤) ∈ {∅} ∧ (( I ↾ ∅) ⊆ 𝑣𝑣 ∈ {∅} ∧ ∃𝑤 ∈ {∅} (𝑤𝑤) ⊆ 𝑣))
60 isust 22054 . . . . 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 1263 . . 3 {∅} ∈ (UnifOn‘∅)
63 snssi 4371 . . 3 ({∅} ∈ (UnifOn‘∅) → {{∅}} ⊆ (UnifOn‘∅))
6462, 63ax-mp 5 . 2 {{∅}} ⊆ (UnifOn‘∅)
6516, 64eqssi 3652 1 (UnifOn‘∅) = {{∅}}
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 196   ∧ w3a 1054   = wceq 1523   ∈ wcel 2030  ∀wral 2941  ∃wrex 2942  Vcvv 3231   ∩ cin 3606   ⊆ wss 3607  ∅c0 3948  𝒫 cpw 4191  {csn 4210   I cid 5052   × cxp 5141  ◡ccnv 5142   ↾ cres 5145   ∘ ccom 5147  ‘cfv 5926  UnifOncust 22050 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-pow 4873  ax-pr 4936  ax-un 6991 This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  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-sbc 3469  df-csb 3567  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-nul 3949  df-if 4120  df-pw 4193  df-sn 4211  df-pr 4213  df-op 4217  df-uni 4469  df-br 4686  df-opab 4746  df-mpt 4763  df-id 5053  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-res 5155  df-iota 5889  df-fun 5928  df-fv 5934  df-ust 22051 This theorem is referenced by:  isusp  22112
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