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| Mirrors > Home > MPE Home > Th. List > Mathboxes > issmfled | Structured version Visualization version GIF version | ||
| Description: A sufficient condition for "𝐹 being a real-valued measurable function w.r.t. to the sigma-algebra 𝑆". (Contributed by Glauco Siliprandi, 26-Jun-2021.) |
| Ref | Expression |
|---|---|
| issmfled.a | ⊢ Ⅎ𝑎𝜑 |
| issmfled.s | ⊢ (𝜑 → 𝑆 ∈ SAlg) |
| issmfled.d | ⊢ (𝜑 → 𝐷 ⊆ ∪ 𝑆) |
| issmfled.f | ⊢ (𝜑 → 𝐹:𝐷⟶ℝ) |
| issmfled.6 | ⊢ ((𝜑 ∧ 𝑎 ∈ ℝ) → {𝑥 ∈ 𝐷 ∣ (𝐹‘𝑥) ≤ 𝑎} ∈ (𝑆 ↾t 𝐷)) |
| Ref | Expression |
|---|---|
| issmfled | ⊢ (𝜑 → 𝐹 ∈ (SMblFn‘𝑆)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | issmfled.f | . . . . 5 ⊢ (𝜑 → 𝐹:𝐷⟶ℝ) | |
| 2 | 1 | fdmd 6714 | . . . 4 ⊢ (𝜑 → dom 𝐹 = 𝐷) |
| 3 | issmfled.d | . . . 4 ⊢ (𝜑 → 𝐷 ⊆ ∪ 𝑆) | |
| 4 | 2, 3 | eqsstrd 3965 | . . 3 ⊢ (𝜑 → dom 𝐹 ⊆ ∪ 𝑆) |
| 5 | 1 | ffdmd 6734 | . . 3 ⊢ (𝜑 → 𝐹:dom 𝐹⟶ℝ) |
| 6 | issmfled.a | . . . 4 ⊢ Ⅎ𝑎𝜑 | |
| 7 | issmfled.6 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑎 ∈ ℝ) → {𝑥 ∈ 𝐷 ∣ (𝐹‘𝑥) ≤ 𝑎} ∈ (𝑆 ↾t 𝐷)) | |
| 8 | 2 | rabeqdv 3427 | . . . . . . . 8 ⊢ (𝜑 → {𝑥 ∈ dom 𝐹 ∣ (𝐹‘𝑥) ≤ 𝑎} = {𝑥 ∈ 𝐷 ∣ (𝐹‘𝑥) ≤ 𝑎}) |
| 9 | 2 | oveq2d 7430 | . . . . . . . 8 ⊢ (𝜑 → (𝑆 ↾t dom 𝐹) = (𝑆 ↾t 𝐷)) |
| 10 | 8, 9 | eleq12d 2854 | . . . . . . 7 ⊢ (𝜑 → ({𝑥 ∈ dom 𝐹 ∣ (𝐹‘𝑥) ≤ 𝑎} ∈ (𝑆 ↾t dom 𝐹) ↔ {𝑥 ∈ 𝐷 ∣ (𝐹‘𝑥) ≤ 𝑎} ∈ (𝑆 ↾t 𝐷))) |
| 11 | 10 | adantr 486 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑎 ∈ ℝ) → ({𝑥 ∈ dom 𝐹 ∣ (𝐹‘𝑥) ≤ 𝑎} ∈ (𝑆 ↾t dom 𝐹) ↔ {𝑥 ∈ 𝐷 ∣ (𝐹‘𝑥) ≤ 𝑎} ∈ (𝑆 ↾t 𝐷))) |
| 12 | 7, 11 | mpbird 260 | . . . . 5 ⊢ ((𝜑 ∧ 𝑎 ∈ ℝ) → {𝑥 ∈ dom 𝐹 ∣ (𝐹‘𝑥) ≤ 𝑎} ∈ (𝑆 ↾t dom 𝐹)) |
| 13 | 12 | ex 418 | . . . 4 ⊢ (𝜑 → (𝑎 ∈ ℝ → {𝑥 ∈ dom 𝐹 ∣ (𝐹‘𝑥) ≤ 𝑎} ∈ (𝑆 ↾t dom 𝐹))) |
| 14 | 6, 13 | ralrimi 3260 | . . 3 ⊢ (𝜑 → ∀𝑎 ∈ ℝ {𝑥 ∈ dom 𝐹 ∣ (𝐹‘𝑥) ≤ 𝑎} ∈ (𝑆 ↾t dom 𝐹)) |
| 15 | 4, 5, 14 | 3jca 1146 | . 2 ⊢ (𝜑 → (dom 𝐹 ⊆ ∪ 𝑆 ∧ 𝐹:dom 𝐹⟶ℝ ∧ ∀𝑎 ∈ ℝ {𝑥 ∈ dom 𝐹 ∣ (𝐹‘𝑥) ≤ 𝑎} ∈ (𝑆 ↾t dom 𝐹))) |
| 16 | issmfled.s | . . 3 ⊢ (𝜑 → 𝑆 ∈ SAlg) | |
| 17 | eqid 2760 | . . 3 ⊢ dom 𝐹 = dom 𝐹 | |
| 18 | 16, 17 | issmfle 47576 | . 2 ⊢ (𝜑 → (𝐹 ∈ (SMblFn‘𝑆) ↔ (dom 𝐹 ⊆ ∪ 𝑆 ∧ 𝐹:dom 𝐹⟶ℝ ∧ ∀𝑎 ∈ ℝ {𝑥 ∈ dom 𝐹 ∣ (𝐹‘𝑥) ≤ 𝑎} ∈ (𝑆 ↾t dom 𝐹)))) |
| 19 | 15, 18 | mpbird 260 | 1 ⊢ (𝜑 → 𝐹 ∈ (SMblFn‘𝑆)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 ∧ w3a 1103 Ⅎwnf 1816 ∈ wcel 2145 ∀wral 3076 {crab 3412 ⊆ wss 3899 ∪ cuni 4867 class class class wbr 5103 dom cdm 5655 ⟶wf 6529 ‘cfv 6533 (class class class)co 7414 ℝcr 11126 ≤ cle 11271 ↾t crest 17508 SAlgcsalg 47139 SMblFncsmblfn 47526 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-rep 5232 ax-sep 5251 ax-nul 5263 ax-pow 5330 ax-pr 5398 ax-un 7737 ax-inf2 9623 ax-cc 10440 ax-cnex 11183 ax-resscn 11184 ax-1cn 11185 ax-icn 11186 ax-addcl 11187 ax-addrcl 11188 ax-mulcl 11189 ax-mulrcl 11190 ax-mulcom 11191 ax-addass 11192 ax-mulass 11193 ax-distr 11194 ax-i2m1 11195 ax-1ne0 11196 ax-1rid 11197 ax-rnegex 11198 ax-rrecex 11199 ax-cnre 11200 ax-pre-lttri 11201 ax-pre-lttrn 11202 ax-pre-ltadd 11203 ax-pre-mulgt0 11204 ax-pre-sup 11205 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-rmo 3365 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-int 4908 df-iun 4953 df-iin 4954 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5550 df-eprel 5555 df-po 5563 df-so 5564 df-fr 5608 df-se 5609 df-we 5610 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-pred 6299 df-ord 6360 df-on 6361 df-lim 6362 df-suc 6363 df-iota 6489 df-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 df-fo 6539 df-f1o 6540 df-fv 6541 df-isom 6542 df-riota 7371 df-ov 7417 df-oprab 7418 df-mpo 7419 df-om 7864 df-1st 7987 df-2nd 7988 df-frecs 8281 df-wrecs 8312 df-recs 8361 df-rdg 8400 df-1o 8458 df-er 8699 df-map 8831 df-pm 8832 df-en 8956 df-dom 8957 df-sdom 8958 df-fin 8959 df-sup 9415 df-inf 9416 df-card 9947 df-acn 9950 df-pnf 11272 df-mnf 11273 df-xr 11274 df-ltxr 11275 df-le 11276 df-sub 11470 df-neg 11471 df-div 11899 df-nn 12261 df-n0 12532 df-z 12619 df-uz 12891 df-q 13001 df-rp 13046 df-ioo 13405 df-ico 13407 df-fl 13856 df-rest 17510 df-salg 47140 df-smblfn 47527 |
| This theorem is used by: smflim 47608 issmfle2d 47640 |
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