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Mathbox for Glauco Siliprandi |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > salrestss | Structured version Visualization version GIF version |
Description: A sigma-algebra restricted to one of its elements is a subset of the original sigma-algebra. (Contributed by Glauco Siliprandi, 21-Dec-2024.) |
Ref | Expression |
---|---|
salrestss.1 | ⊢ (𝜑 → 𝑆 ∈ SAlg) |
salrestss.2 | ⊢ (𝜑 → 𝐸 ∈ 𝑆) |
Ref | Expression |
---|---|
salrestss | ⊢ (𝜑 → (𝑆 ↾t 𝐸) ⊆ 𝑆) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simpr 485 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝑆 ↾t 𝐸)) → 𝑥 ∈ (𝑆 ↾t 𝐸)) | |
2 | salrestss.1 | . . . . . 6 ⊢ (𝜑 → 𝑆 ∈ SAlg) | |
3 | 2 | adantr 481 | . . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝑆 ↾t 𝐸)) → 𝑆 ∈ SAlg) |
4 | salrestss.2 | . . . . . 6 ⊢ (𝜑 → 𝐸 ∈ 𝑆) | |
5 | 4 | adantr 481 | . . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝑆 ↾t 𝐸)) → 𝐸 ∈ 𝑆) |
6 | elrest 17338 | . . . . 5 ⊢ ((𝑆 ∈ SAlg ∧ 𝐸 ∈ 𝑆) → (𝑥 ∈ (𝑆 ↾t 𝐸) ↔ ∃𝑦 ∈ 𝑆 𝑥 = (𝑦 ∩ 𝐸))) | |
7 | 3, 5, 6 | syl2anc 584 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝑆 ↾t 𝐸)) → (𝑥 ∈ (𝑆 ↾t 𝐸) ↔ ∃𝑦 ∈ 𝑆 𝑥 = (𝑦 ∩ 𝐸))) |
8 | 1, 7 | mpbid 231 | . . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝑆 ↾t 𝐸)) → ∃𝑦 ∈ 𝑆 𝑥 = (𝑦 ∩ 𝐸)) |
9 | simprr 771 | . . . . 5 ⊢ ((𝜑 ∧ (𝑦 ∈ 𝑆 ∧ 𝑥 = (𝑦 ∩ 𝐸))) → 𝑥 = (𝑦 ∩ 𝐸)) | |
10 | 2 | adantr 481 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝑆) → 𝑆 ∈ SAlg) |
11 | simpr 485 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝑆) → 𝑦 ∈ 𝑆) | |
12 | 4 | adantr 481 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝑆) → 𝐸 ∈ 𝑆) |
13 | 10, 11, 12 | salincld 44746 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝑆) → (𝑦 ∩ 𝐸) ∈ 𝑆) |
14 | 13 | adantrr 715 | . . . . 5 ⊢ ((𝜑 ∧ (𝑦 ∈ 𝑆 ∧ 𝑥 = (𝑦 ∩ 𝐸))) → (𝑦 ∩ 𝐸) ∈ 𝑆) |
15 | 9, 14 | eqeltrd 2832 | . . . 4 ⊢ ((𝜑 ∧ (𝑦 ∈ 𝑆 ∧ 𝑥 = (𝑦 ∩ 𝐸))) → 𝑥 ∈ 𝑆) |
16 | 15 | adantlr 713 | . . 3 ⊢ (((𝜑 ∧ 𝑥 ∈ (𝑆 ↾t 𝐸)) ∧ (𝑦 ∈ 𝑆 ∧ 𝑥 = (𝑦 ∩ 𝐸))) → 𝑥 ∈ 𝑆) |
17 | 8, 16 | rexlimddv 3160 | . 2 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝑆 ↾t 𝐸)) → 𝑥 ∈ 𝑆) |
18 | 17 | ssd 43445 | 1 ⊢ (𝜑 → (𝑆 ↾t 𝐸) ⊆ 𝑆) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 = wceq 1541 ∈ wcel 2106 ∃wrex 3069 ∩ cin 3927 ⊆ wss 3928 (class class class)co 7377 ↾t crest 17331 SAlgcsalg 44702 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2702 ax-rep 5262 ax-sep 5276 ax-nul 5283 ax-pow 5340 ax-pr 5404 ax-un 7692 ax-inf2 9601 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2533 df-eu 2562 df-clab 2709 df-cleq 2723 df-clel 2809 df-nfc 2884 df-ne 2940 df-ral 3061 df-rex 3070 df-reu 3365 df-rab 3419 df-v 3461 df-sbc 3758 df-csb 3874 df-dif 3931 df-un 3933 df-in 3935 df-ss 3945 df-pss 3947 df-nul 4303 df-if 4507 df-pw 4582 df-sn 4607 df-pr 4609 df-op 4613 df-uni 4886 df-int 4928 df-iun 4976 df-br 5126 df-opab 5188 df-mpt 5209 df-tr 5243 df-id 5551 df-eprel 5557 df-po 5565 df-so 5566 df-fr 5608 df-we 5610 df-xp 5659 df-rel 5660 df-cnv 5661 df-co 5662 df-dm 5663 df-rn 5664 df-res 5665 df-ima 5666 df-pred 6273 df-ord 6340 df-on 6341 df-lim 6342 df-suc 6343 df-iota 6468 df-fun 6518 df-fn 6519 df-f 6520 df-f1 6521 df-fo 6522 df-f1o 6523 df-fv 6524 df-ov 7380 df-oprab 7381 df-mpo 7382 df-om 7823 df-2nd 7942 df-frecs 8232 df-wrecs 8263 df-recs 8337 df-rdg 8376 df-1o 8432 df-er 8670 df-en 8906 df-dom 8907 df-sdom 8908 df-fin 8909 df-rest 17333 df-salg 44703 |
This theorem is referenced by: smfdmmblpimne 45231 smfdivdmmbl2 45235 smfsupdmmbllem 45238 smfinfdmmbllem 45242 |
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