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Mathbox for Glauco Siliprandi |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > issalnnd | Structured version Visualization version GIF version |
Description: Sufficient condition to prove that 𝑆 is sigma-algebra. (Contributed by Glauco Siliprandi, 3-Mar-2021.) |
Ref | Expression |
---|---|
issalnnd.s | ⊢ (𝜑 → 𝑆 ∈ 𝑉) |
issalnnd.z | ⊢ (𝜑 → ∅ ∈ 𝑆) |
issalnnd.x | ⊢ 𝑋 = ∪ 𝑆 |
issalnnd.d | ⊢ ((𝜑 ∧ 𝑦 ∈ 𝑆) → (𝑋 ∖ 𝑦) ∈ 𝑆) |
issalnnd.i | ⊢ ((𝜑 ∧ 𝑒:ℕ⟶𝑆) → ∪ 𝑛 ∈ ℕ (𝑒‘𝑛) ∈ 𝑆) |
Ref | Expression |
---|---|
issalnnd | ⊢ (𝜑 → 𝑆 ∈ SAlg) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | issalnnd.s | . 2 ⊢ (𝜑 → 𝑆 ∈ 𝑉) | |
2 | issalnnd.z | . 2 ⊢ (𝜑 → ∅ ∈ 𝑆) | |
3 | issalnnd.x | . 2 ⊢ 𝑋 = ∪ 𝑆 | |
4 | issalnnd.d | . 2 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝑆) → (𝑋 ∖ 𝑦) ∈ 𝑆) | |
5 | unieq 4596 | . . . . . . 7 ⊢ (𝑦 = ∅ → ∪ 𝑦 = ∪ ∅) | |
6 | uni0 4617 | . . . . . . . 8 ⊢ ∪ ∅ = ∅ | |
7 | 6 | a1i 11 | . . . . . . 7 ⊢ (𝑦 = ∅ → ∪ ∅ = ∅) |
8 | 5, 7 | eqtrd 2794 | . . . . . 6 ⊢ (𝑦 = ∅ → ∪ 𝑦 = ∅) |
9 | 8 | adantl 473 | . . . . 5 ⊢ ((𝜑 ∧ 𝑦 = ∅) → ∪ 𝑦 = ∅) |
10 | 2 | adantr 472 | . . . . 5 ⊢ ((𝜑 ∧ 𝑦 = ∅) → ∅ ∈ 𝑆) |
11 | 9, 10 | eqeltrd 2839 | . . . 4 ⊢ ((𝜑 ∧ 𝑦 = ∅) → ∪ 𝑦 ∈ 𝑆) |
12 | 11 | 3ad2antl1 1201 | . . 3 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝒫 𝑆 ∧ 𝑦 ≼ ω) ∧ 𝑦 = ∅) → ∪ 𝑦 ∈ 𝑆) |
13 | neqne 2940 | . . . . 5 ⊢ (¬ 𝑦 = ∅ → 𝑦 ≠ ∅) | |
14 | 13 | adantl 473 | . . . 4 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝒫 𝑆 ∧ 𝑦 ≼ ω) ∧ ¬ 𝑦 = ∅) → 𝑦 ≠ ∅) |
15 | nnfoctb 39730 | . . . . . 6 ⊢ ((𝑦 ≼ ω ∧ 𝑦 ≠ ∅) → ∃𝑒 𝑒:ℕ–onto→𝑦) | |
16 | 15 | 3ad2antl3 1203 | . . . . 5 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝒫 𝑆 ∧ 𝑦 ≼ ω) ∧ 𝑦 ≠ ∅) → ∃𝑒 𝑒:ℕ–onto→𝑦) |
17 | founiiun 39877 | . . . . . . . . . . 11 ⊢ (𝑒:ℕ–onto→𝑦 → ∪ 𝑦 = ∪ 𝑛 ∈ ℕ (𝑒‘𝑛)) | |
18 | 17 | adantl 473 | . . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝒫 𝑆) ∧ 𝑒:ℕ–onto→𝑦) → ∪ 𝑦 = ∪ 𝑛 ∈ ℕ (𝑒‘𝑛)) |
19 | simpll 807 | . . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝒫 𝑆) ∧ 𝑒:ℕ–onto→𝑦) → 𝜑) | |
20 | fof 6277 | . . . . . . . . . . . . . 14 ⊢ (𝑒:ℕ–onto→𝑦 → 𝑒:ℕ⟶𝑦) | |
21 | 20 | adantl 473 | . . . . . . . . . . . . 13 ⊢ ((𝑦 ∈ 𝒫 𝑆 ∧ 𝑒:ℕ–onto→𝑦) → 𝑒:ℕ⟶𝑦) |
22 | elpwi 4312 | . . . . . . . . . . . . . 14 ⊢ (𝑦 ∈ 𝒫 𝑆 → 𝑦 ⊆ 𝑆) | |
23 | 22 | adantr 472 | . . . . . . . . . . . . 13 ⊢ ((𝑦 ∈ 𝒫 𝑆 ∧ 𝑒:ℕ–onto→𝑦) → 𝑦 ⊆ 𝑆) |
24 | 21, 23 | fssd 6218 | . . . . . . . . . . . 12 ⊢ ((𝑦 ∈ 𝒫 𝑆 ∧ 𝑒:ℕ–onto→𝑦) → 𝑒:ℕ⟶𝑆) |
25 | 24 | adantll 752 | . . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝒫 𝑆) ∧ 𝑒:ℕ–onto→𝑦) → 𝑒:ℕ⟶𝑆) |
26 | issalnnd.i | . . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑒:ℕ⟶𝑆) → ∪ 𝑛 ∈ ℕ (𝑒‘𝑛) ∈ 𝑆) | |
27 | 19, 25, 26 | syl2anc 696 | . . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝒫 𝑆) ∧ 𝑒:ℕ–onto→𝑦) → ∪ 𝑛 ∈ ℕ (𝑒‘𝑛) ∈ 𝑆) |
28 | 18, 27 | eqeltrd 2839 | . . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝒫 𝑆) ∧ 𝑒:ℕ–onto→𝑦) → ∪ 𝑦 ∈ 𝑆) |
29 | 28 | ex 449 | . . . . . . . 8 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝒫 𝑆) → (𝑒:ℕ–onto→𝑦 → ∪ 𝑦 ∈ 𝑆)) |
30 | 29 | adantr 472 | . . . . . . 7 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝒫 𝑆) ∧ 𝑦 ≠ ∅) → (𝑒:ℕ–onto→𝑦 → ∪ 𝑦 ∈ 𝑆)) |
31 | 30 | 3adantl3 1174 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝒫 𝑆 ∧ 𝑦 ≼ ω) ∧ 𝑦 ≠ ∅) → (𝑒:ℕ–onto→𝑦 → ∪ 𝑦 ∈ 𝑆)) |
32 | 31 | exlimdv 2010 | . . . . 5 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝒫 𝑆 ∧ 𝑦 ≼ ω) ∧ 𝑦 ≠ ∅) → (∃𝑒 𝑒:ℕ–onto→𝑦 → ∪ 𝑦 ∈ 𝑆)) |
33 | 16, 32 | mpd 15 | . . . 4 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝒫 𝑆 ∧ 𝑦 ≼ ω) ∧ 𝑦 ≠ ∅) → ∪ 𝑦 ∈ 𝑆) |
34 | 14, 33 | syldan 488 | . . 3 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝒫 𝑆 ∧ 𝑦 ≼ ω) ∧ ¬ 𝑦 = ∅) → ∪ 𝑦 ∈ 𝑆) |
35 | 12, 34 | pm2.61dan 867 | . 2 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝒫 𝑆 ∧ 𝑦 ≼ ω) → ∪ 𝑦 ∈ 𝑆) |
36 | 1, 2, 3, 4, 35 | issald 41072 | 1 ⊢ (𝜑 → 𝑆 ∈ SAlg) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ∧ wa 383 ∧ w3a 1072 = wceq 1632 ∃wex 1853 ∈ wcel 2139 ≠ wne 2932 ∖ cdif 3712 ⊆ wss 3715 ∅c0 4058 𝒫 cpw 4302 ∪ cuni 4588 ∪ ciun 4672 class class class wbr 4804 ⟶wf 6045 –onto→wfo 6047 ‘cfv 6049 ωcom 7231 ≼ cdom 8121 ℕcn 11232 SAlgcsalg 41049 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1871 ax-4 1886 ax-5 1988 ax-6 2054 ax-7 2090 ax-8 2141 ax-9 2148 ax-10 2168 ax-11 2183 ax-12 2196 ax-13 2391 ax-ext 2740 ax-sep 4933 ax-nul 4941 ax-pow 4992 ax-pr 5055 ax-un 7115 ax-inf2 8713 ax-cnex 10204 ax-resscn 10205 ax-1cn 10206 ax-icn 10207 ax-addcl 10208 ax-addrcl 10209 ax-mulcl 10210 ax-mulrcl 10211 ax-mulcom 10212 ax-addass 10213 ax-mulass 10214 ax-distr 10215 ax-i2m1 10216 ax-1ne0 10217 ax-1rid 10218 ax-rnegex 10219 ax-rrecex 10220 ax-cnre 10221 ax-pre-lttri 10222 ax-pre-lttrn 10223 ax-pre-ltadd 10224 ax-pre-mulgt0 10225 |
This theorem depends on definitions: df-bi 197 df-or 384 df-an 385 df-3or 1073 df-3an 1074 df-tru 1635 df-ex 1854 df-nf 1859 df-sb 2047 df-eu 2611 df-mo 2612 df-clab 2747 df-cleq 2753 df-clel 2756 df-nfc 2891 df-ne 2933 df-nel 3036 df-ral 3055 df-rex 3056 df-reu 3057 df-rab 3059 df-v 3342 df-sbc 3577 df-csb 3675 df-dif 3718 df-un 3720 df-in 3722 df-ss 3729 df-pss 3731 df-nul 4059 df-if 4231 df-pw 4304 df-sn 4322 df-pr 4324 df-tp 4326 df-op 4328 df-uni 4589 df-iun 4674 df-br 4805 df-opab 4865 df-mpt 4882 df-tr 4905 df-id 5174 df-eprel 5179 df-po 5187 df-so 5188 df-fr 5225 df-we 5227 df-xp 5272 df-rel 5273 df-cnv 5274 df-co 5275 df-dm 5276 df-rn 5277 df-res 5278 df-ima 5279 df-pred 5841 df-ord 5887 df-on 5888 df-lim 5889 df-suc 5890 df-iota 6012 df-fun 6051 df-fn 6052 df-f 6053 df-f1 6054 df-fo 6055 df-f1o 6056 df-fv 6057 df-riota 6775 df-ov 6817 df-oprab 6818 df-mpt2 6819 df-om 7232 df-wrecs 7577 df-recs 7638 df-rdg 7676 df-er 7913 df-en 8124 df-dom 8125 df-sdom 8126 df-pnf 10288 df-mnf 10289 df-xr 10290 df-ltxr 10291 df-le 10292 df-sub 10480 df-neg 10481 df-nn 11233 df-n0 11505 df-z 11590 df-uz 11900 df-salg 41050 |
This theorem is referenced by: dmvolsal 41085 subsalsal 41098 smfresal 41519 |
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