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Theorem prsiga 30551
Description: The smallest possible sigma-algebra containing 𝑂. (Contributed by Thierry Arnoux, 13-Sep-2016.)
Assertion
Ref Expression
prsiga (𝑂𝑉 → {∅, 𝑂} ∈ (sigAlgebra‘𝑂))

Proof of Theorem prsiga
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 0elpw 4979 . . 3 ∅ ∈ 𝒫 𝑂
2 pwidg 4322 . . 3 (𝑂𝑉𝑂 ∈ 𝒫 𝑂)
3 prssi 4498 . . 3 ((∅ ∈ 𝒫 𝑂𝑂 ∈ 𝒫 𝑂) → {∅, 𝑂} ⊆ 𝒫 𝑂)
41, 2, 3sylancr 576 . 2 (𝑂𝑉 → {∅, 𝑂} ⊆ 𝒫 𝑂)
5 prid2g 4443 . . 3 (𝑂𝑉𝑂 ∈ {∅, 𝑂})
6 dif0 4108 . . . . 5 (𝑂 ∖ ∅) = 𝑂
76, 5syl5eqel 2857 . . . 4 (𝑂𝑉 → (𝑂 ∖ ∅) ∈ {∅, 𝑂})
8 difid 4106 . . . . 5 (𝑂𝑂) = ∅
9 0ex 4937 . . . . . . 7 ∅ ∈ V
109prid1 4444 . . . . . 6 ∅ ∈ {∅, 𝑂}
1110a1i 11 . . . . 5 (𝑂𝑉 → ∅ ∈ {∅, 𝑂})
128, 11syl5eqel 2857 . . . 4 (𝑂𝑉 → (𝑂𝑂) ∈ {∅, 𝑂})
13 difeq2 3880 . . . . . . 7 (𝑥 = ∅ → (𝑂𝑥) = (𝑂 ∖ ∅))
1413eleq1d 2838 . . . . . 6 (𝑥 = ∅ → ((𝑂𝑥) ∈ {∅, 𝑂} ↔ (𝑂 ∖ ∅) ∈ {∅, 𝑂}))
15 difeq2 3880 . . . . . . 7 (𝑥 = 𝑂 → (𝑂𝑥) = (𝑂𝑂))
1615eleq1d 2838 . . . . . 6 (𝑥 = 𝑂 → ((𝑂𝑥) ∈ {∅, 𝑂} ↔ (𝑂𝑂) ∈ {∅, 𝑂}))
1714, 16ralprg 4382 . . . . 5 ((∅ ∈ V ∧ 𝑂𝑉) → (∀𝑥 ∈ {∅, 𝑂} (𝑂𝑥) ∈ {∅, 𝑂} ↔ ((𝑂 ∖ ∅) ∈ {∅, 𝑂} ∧ (𝑂𝑂) ∈ {∅, 𝑂})))
189, 17mpan 671 . . . 4 (𝑂𝑉 → (∀𝑥 ∈ {∅, 𝑂} (𝑂𝑥) ∈ {∅, 𝑂} ↔ ((𝑂 ∖ ∅) ∈ {∅, 𝑂} ∧ (𝑂𝑂) ∈ {∅, 𝑂})))
197, 12, 18mpbir2and 693 . . 3 (𝑂𝑉 → ∀𝑥 ∈ {∅, 𝑂} (𝑂𝑥) ∈ {∅, 𝑂})
20 uni0 4612 . . . . . . . . 9 ∅ = ∅
2120, 10eqeltri 2849 . . . . . . . 8 ∅ ∈ {∅, 𝑂}
229unisn 4600 . . . . . . . . 9 {∅} = ∅
2322, 10eqeltri 2849 . . . . . . . 8 {∅} ∈ {∅, 𝑂}
2421, 23pm3.2i 457 . . . . . . 7 ( ∅ ∈ {∅, 𝑂} ∧ {∅} ∈ {∅, 𝑂})
25 snex 5050 . . . . . . . . 9 {∅} ∈ V
269, 25pm3.2i 457 . . . . . . . 8 (∅ ∈ V ∧ {∅} ∈ V)
27 unieq 4593 . . . . . . . . . 10 (𝑥 = ∅ → 𝑥 = ∅)
2827eleq1d 2838 . . . . . . . . 9 (𝑥 = ∅ → ( 𝑥 ∈ {∅, 𝑂} ↔ ∅ ∈ {∅, 𝑂}))
29 unieq 4593 . . . . . . . . . 10 (𝑥 = {∅} → 𝑥 = {∅})
3029eleq1d 2838 . . . . . . . . 9 (𝑥 = {∅} → ( 𝑥 ∈ {∅, 𝑂} ↔ {∅} ∈ {∅, 𝑂}))
3128, 30ralprg 4382 . . . . . . . 8 ((∅ ∈ V ∧ {∅} ∈ V) → (∀𝑥 ∈ {∅, {∅}} 𝑥 ∈ {∅, 𝑂} ↔ ( ∅ ∈ {∅, 𝑂} ∧ {∅} ∈ {∅, 𝑂})))
3226, 31mp1i 13 . . . . . . 7 (𝑂𝑉 → (∀𝑥 ∈ {∅, {∅}} 𝑥 ∈ {∅, 𝑂} ↔ ( ∅ ∈ {∅, 𝑂} ∧ {∅} ∈ {∅, 𝑂})))
3324, 32mpbiri 249 . . . . . 6 (𝑂𝑉 → ∀𝑥 ∈ {∅, {∅}} 𝑥 ∈ {∅, 𝑂})
34 unisng 4601 . . . . . . . 8 (𝑂𝑉 {𝑂} = 𝑂)
3534, 5eqeltrd 2853 . . . . . . 7 (𝑂𝑉 {𝑂} ∈ {∅, 𝑂})
36 uniprg 4599 . . . . . . . . . 10 ((∅ ∈ V ∧ 𝑂𝑉) → {∅, 𝑂} = (∅ ∪ 𝑂))
379, 36mpan 671 . . . . . . . . 9 (𝑂𝑉 {∅, 𝑂} = (∅ ∪ 𝑂))
38 uncom 3915 . . . . . . . . . 10 (∅ ∪ 𝑂) = (𝑂 ∪ ∅)
39 un0 4122 . . . . . . . . . 10 (𝑂 ∪ ∅) = 𝑂
4038, 39eqtri 2796 . . . . . . . . 9 (∅ ∪ 𝑂) = 𝑂
4137, 40syl6eq 2824 . . . . . . . 8 (𝑂𝑉 {∅, 𝑂} = 𝑂)
4241, 5eqeltrd 2853 . . . . . . 7 (𝑂𝑉 {∅, 𝑂} ∈ {∅, 𝑂})
43 snex 5050 . . . . . . . . 9 {𝑂} ∈ V
44 prex 5051 . . . . . . . . 9 {∅, 𝑂} ∈ V
4543, 44pm3.2i 457 . . . . . . . 8 ({𝑂} ∈ V ∧ {∅, 𝑂} ∈ V)
46 unieq 4593 . . . . . . . . . 10 (𝑥 = {𝑂} → 𝑥 = {𝑂})
4746eleq1d 2838 . . . . . . . . 9 (𝑥 = {𝑂} → ( 𝑥 ∈ {∅, 𝑂} ↔ {𝑂} ∈ {∅, 𝑂}))
48 unieq 4593 . . . . . . . . . 10 (𝑥 = {∅, 𝑂} → 𝑥 = {∅, 𝑂})
4948eleq1d 2838 . . . . . . . . 9 (𝑥 = {∅, 𝑂} → ( 𝑥 ∈ {∅, 𝑂} ↔ {∅, 𝑂} ∈ {∅, 𝑂}))
5047, 49ralprg 4382 . . . . . . . 8 (({𝑂} ∈ V ∧ {∅, 𝑂} ∈ V) → (∀𝑥 ∈ {{𝑂}, {∅, 𝑂}} 𝑥 ∈ {∅, 𝑂} ↔ ( {𝑂} ∈ {∅, 𝑂} ∧ {∅, 𝑂} ∈ {∅, 𝑂})))
5145, 50mp1i 13 . . . . . . 7 (𝑂𝑉 → (∀𝑥 ∈ {{𝑂}, {∅, 𝑂}} 𝑥 ∈ {∅, 𝑂} ↔ ( {𝑂} ∈ {∅, 𝑂} ∧ {∅, 𝑂} ∈ {∅, 𝑂})))
5235, 42, 51mpbir2and 693 . . . . . 6 (𝑂𝑉 → ∀𝑥 ∈ {{𝑂}, {∅, 𝑂}} 𝑥 ∈ {∅, 𝑂})
53 ralun 3953 . . . . . 6 ((∀𝑥 ∈ {∅, {∅}} 𝑥 ∈ {∅, 𝑂} ∧ ∀𝑥 ∈ {{𝑂}, {∅, 𝑂}} 𝑥 ∈ {∅, 𝑂}) → ∀𝑥 ∈ ({∅, {∅}} ∪ {{𝑂}, {∅, 𝑂}}) 𝑥 ∈ {∅, 𝑂})
5433, 52, 53syl2anc 574 . . . . 5 (𝑂𝑉 → ∀𝑥 ∈ ({∅, {∅}} ∪ {{𝑂}, {∅, 𝑂}}) 𝑥 ∈ {∅, 𝑂})
55 pwpr 4579 . . . . . 6 𝒫 {∅, 𝑂} = ({∅, {∅}} ∪ {{𝑂}, {∅, 𝑂}})
5655raleqi 3295 . . . . 5 (∀𝑥 ∈ 𝒫 {∅, 𝑂} 𝑥 ∈ {∅, 𝑂} ↔ ∀𝑥 ∈ ({∅, {∅}} ∪ {{𝑂}, {∅, 𝑂}}) 𝑥 ∈ {∅, 𝑂})
5754, 56sylibr 225 . . . 4 (𝑂𝑉 → ∀𝑥 ∈ 𝒫 {∅, 𝑂} 𝑥 ∈ {∅, 𝑂})
58 ax-1 6 . . . . 5 ( 𝑥 ∈ {∅, 𝑂} → (𝑥 ≼ ω → 𝑥 ∈ {∅, 𝑂}))
5958ralimi 3104 . . . 4 (∀𝑥 ∈ 𝒫 {∅, 𝑂} 𝑥 ∈ {∅, 𝑂} → ∀𝑥 ∈ 𝒫 {∅, 𝑂} (𝑥 ≼ ω → 𝑥 ∈ {∅, 𝑂}))
6057, 59syl 17 . . 3 (𝑂𝑉 → ∀𝑥 ∈ 𝒫 {∅, 𝑂} (𝑥 ≼ ω → 𝑥 ∈ {∅, 𝑂}))
615, 19, 603jca 1149 . 2 (𝑂𝑉 → (𝑂 ∈ {∅, 𝑂} ∧ ∀𝑥 ∈ {∅, 𝑂} (𝑂𝑥) ∈ {∅, 𝑂} ∧ ∀𝑥 ∈ 𝒫 {∅, 𝑂} (𝑥 ≼ ω → 𝑥 ∈ {∅, 𝑂})))
62 issiga 30531 . . 3 ({∅, 𝑂} ∈ V → ({∅, 𝑂} ∈ (sigAlgebra‘𝑂) ↔ ({∅, 𝑂} ⊆ 𝒫 𝑂 ∧ (𝑂 ∈ {∅, 𝑂} ∧ ∀𝑥 ∈ {∅, 𝑂} (𝑂𝑥) ∈ {∅, 𝑂} ∧ ∀𝑥 ∈ 𝒫 {∅, 𝑂} (𝑥 ≼ ω → 𝑥 ∈ {∅, 𝑂})))))
6344, 62ax-mp 5 . 2 ({∅, 𝑂} ∈ (sigAlgebra‘𝑂) ↔ ({∅, 𝑂} ⊆ 𝒫 𝑂 ∧ (𝑂 ∈ {∅, 𝑂} ∧ ∀𝑥 ∈ {∅, 𝑂} (𝑂𝑥) ∈ {∅, 𝑂} ∧ ∀𝑥 ∈ 𝒫 {∅, 𝑂} (𝑥 ≼ ω → 𝑥 ∈ {∅, 𝑂}))))
644, 61, 63sylanbrc 573 1 (𝑂𝑉 → {∅, 𝑂} ∈ (sigAlgebra‘𝑂))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 197  wa 383  w3a 1098   = wceq 1634  wcel 2148  wral 3064  Vcvv 3355  cdif 3726  cun 3727  wss 3729  c0 4073  𝒫 cpw 4307  {csn 4326  {cpr 4328   cuni 4585   class class class wbr 4797  cfv 6042  ωcom 7233  cdom 8128  sigAlgebracsiga 30527
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1873  ax-4 1888  ax-5 1994  ax-6 2060  ax-7 2096  ax-8 2150  ax-9 2157  ax-10 2177  ax-11 2193  ax-12 2206  ax-13 2411  ax-ext 2754  ax-sep 4928  ax-nul 4936  ax-pow 4988  ax-pr 5048
This theorem depends on definitions:  df-bi 198  df-an 384  df-or 864  df-3an 1100  df-tru 1637  df-fal 1640  df-ex 1856  df-nf 1861  df-sb 2053  df-eu 2625  df-mo 2626  df-clab 2761  df-cleq 2767  df-clel 2770  df-nfc 2905  df-ne 2947  df-ral 3069  df-rex 3070  df-rab 3073  df-v 3357  df-sbc 3594  df-csb 3689  df-dif 3732  df-un 3734  df-in 3736  df-ss 3743  df-nul 4074  df-if 4236  df-pw 4309  df-sn 4327  df-pr 4329  df-op 4333  df-uni 4586  df-br 4798  df-opab 4860  df-mpt 4877  df-id 5171  df-xp 5269  df-rel 5270  df-cnv 5271  df-co 5272  df-dm 5273  df-iota 6005  df-fun 6044  df-fv 6050  df-siga 30528
This theorem is referenced by: (None)
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