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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 6716 | . . . 4 ⊢ (𝜑 → dom 𝐹 = 𝐷) |
| 3 | issmfled.d | . . . 4 ⊢ (𝜑 → 𝐷 ⊆ ∪ 𝑆) | |
| 4 | 2, 3 | eqsstrd 3971 | . . 3 ⊢ (𝜑 → dom 𝐹 ⊆ ∪ 𝑆) |
| 5 | 1 | ffdmd 6736 | . . 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 3431 | . . . . . . . 8 ⊢ (𝜑 → {𝑥 ∈ dom 𝐹 ∣ (𝐹‘𝑥) ≤ 𝑎} = {𝑥 ∈ 𝐷 ∣ (𝐹‘𝑥) ≤ 𝑎}) |
| 9 | 2 | oveq2d 7426 | . . . . . . . 8 ⊢ (𝜑 → (𝑆 ↾t dom 𝐹) = (𝑆 ↾t 𝐷)) |
| 10 | 8, 9 | eleq12d 2857 | . . . . . . 7 ⊢ (𝜑 → ({𝑥 ∈ dom 𝐹 ∣ (𝐹‘𝑥) ≤ 𝑎} ∈ (𝑆 ↾t dom 𝐹) ↔ {𝑥 ∈ 𝐷 ∣ (𝐹‘𝑥) ≤ 𝑎} ∈ (𝑆 ↾t 𝐷))) |
| 11 | 10 | adantr 485 | . . . . . 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 417 | . . . 4 ⊢ (𝜑 → (𝑎 ∈ ℝ → {𝑥 ∈ dom 𝐹 ∣ (𝐹‘𝑥) ≤ 𝑎} ∈ (𝑆 ↾t dom 𝐹))) |
| 14 | 6, 13 | ralrimi 3263 | . . 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 2763 | . . 3 ⊢ dom 𝐹 = dom 𝐹 | |
| 18 | 16, 17 | issmfle 47487 | . 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 400 ∧ w3a 1103 Ⅎwnf 1813 ∈ wcel 2143 ∀wral 3079 {crab 3416 ⊆ wss 3905 ∪ cuni 4872 class class class wbr 5109 dom cdm 5661 ⟶wf 6532 ‘cfv 6536 (class class class)co 7410 ℝcr 11103 ≤ cle 11248 ↾t crest 17477 SAlgcsalg 47050 SMblFncsmblfn 47437 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-10 2176 ax-11 2192 ax-12 2213 ax-ext 2735 ax-rep 5238 ax-sep 5257 ax-nul 5269 ax-pow 5336 ax-pr 5404 ax-un 7732 ax-inf2 9606 ax-cc 10423 ax-ac2 10451 ax-cnex 11160 ax-resscn 11161 ax-1cn 11162 ax-icn 11163 ax-addcl 11164 ax-addrcl 11165 ax-mulcl 11166 ax-mulrcl 11167 ax-mulcom 11168 ax-addass 11169 ax-mulass 11170 ax-distr 11171 ax-i2m1 11172 ax-1ne0 11173 ax-1rid 11174 ax-rnegex 11175 ax-rrecex 11176 ax-cnre 11177 ax-pre-lttri 11178 ax-pre-lttrn 11179 ax-pre-ltadd 11180 ax-pre-mulgt0 11181 ax-pre-sup 11182 |
| This proof depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1810 df-nf 1814 df-sb 2097 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-nfc 2912 df-ne 2959 df-nel 3065 df-ral 3080 df-rex 3090 df-rmo 3369 df-reu 3370 df-rab 3417 df-v 3457 df-sbc 3745 df-csb 3854 df-dif 3908 df-un 3910 df-in 3912 df-ss 3922 df-pss 3925 df-nul 4287 df-if 4488 df-pw 4564 df-sn 4590 df-pr 4592 df-op 4596 df-uni 4873 df-int 4913 df-iun 4958 df-iin 4959 df-br 5110 df-opab 5174 df-mpt 5193 df-tr 5219 df-id 5556 df-eprel 5561 df-po 5569 df-so 5570 df-fr 5614 df-se 5615 df-we 5616 df-xp 5667 df-rel 5668 df-cnv 5669 df-co 5670 df-dm 5671 df-rn 5672 df-res 5673 df-ima 5674 df-pred 6302 df-ord 6363 df-on 6364 df-lim 6365 df-suc 6366 df-iota 6492 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 df-fv 6544 df-isom 6545 df-riota 7367 df-ov 7413 df-oprab 7414 df-mpo 7415 df-om 7859 df-1st 7982 df-2nd 7983 df-frecs 8274 df-wrecs 8305 df-recs 8354 df-rdg 8393 df-1o 8449 df-er 8690 df-map 8822 df-pm 8823 df-en 8940 df-dom 8941 df-sdom 8942 df-fin 8943 df-sup 9398 df-inf 9399 df-card 9930 df-acn 9933 df-ac 10105 df-pnf 11249 df-mnf 11250 df-xr 11251 df-ltxr 11252 df-le 11253 df-sub 11447 df-neg 11448 df-div 11876 df-nn 12238 df-n0 12509 df-z 12596 df-uz 12867 df-q 12977 df-rp 13021 df-ioo 13380 df-ico 13382 df-fl 13830 df-rest 17479 df-salg 47051 df-smblfn 47438 |
| This theorem is used by: smflim 47519 issmfle2d 47551 |
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