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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 6666 | . . . 4 ⊢ (𝜑 → dom 𝐹 = 𝐷) |
| 3 | issmfled.d | . . . 4 ⊢ (𝜑 → 𝐷 ⊆ ∪ 𝑆) | |
| 4 | 2, 3 | eqsstrd 3949 | . . 3 ⊢ (𝜑 → dom 𝐹 ⊆ ∪ 𝑆) |
| 5 | 1 | ffdmd 6686 | . . 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 3406 | . . . . . . . 8 ⊢ (𝜑 → {𝑥 ∈ dom 𝐹 ∣ (𝐹‘𝑥) ≤ 𝑎} = {𝑥 ∈ 𝐷 ∣ (𝐹‘𝑥) ≤ 𝑎}) |
| 9 | 2 | oveq2d 7373 | . . . . . . . 8 ⊢ (𝜑 → (𝑆 ↾t dom 𝐹) = (𝑆 ↾t 𝐷)) |
| 10 | 8, 9 | eleq12d 2833 | . . . . . . 7 ⊢ (𝜑 → ({𝑥 ∈ dom 𝐹 ∣ (𝐹‘𝑥) ≤ 𝑎} ∈ (𝑆 ↾t dom 𝐹) ↔ {𝑥 ∈ 𝐷 ∣ (𝐹‘𝑥) ≤ 𝑎} ∈ (𝑆 ↾t 𝐷))) |
| 11 | 10 | adantr 481 | . . . . . 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 258 | . . . . 5 ⊢ ((𝜑 ∧ 𝑎 ∈ ℝ) → {𝑥 ∈ dom 𝐹 ∣ (𝐹‘𝑥) ≤ 𝑎} ∈ (𝑆 ↾t dom 𝐹)) |
| 13 | 12 | ex 413 | . . . 4 ⊢ (𝜑 → (𝑎 ∈ ℝ → {𝑥 ∈ dom 𝐹 ∣ (𝐹‘𝑥) ≤ 𝑎} ∈ (𝑆 ↾t dom 𝐹))) |
| 14 | 6, 13 | ralrimi 3237 | . . 3 ⊢ (𝜑 → ∀𝑎 ∈ ℝ {𝑥 ∈ dom 𝐹 ∣ (𝐹‘𝑥) ≤ 𝑎} ∈ (𝑆 ↾t dom 𝐹)) |
| 15 | 4, 5, 14 | 3jca 1134 | . 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 2739 | . . 3 ⊢ dom 𝐹 = dom 𝐹 | |
| 18 | 16, 17 | issmfle 47196 | . 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 258 | 1 ⊢ (𝜑 → 𝐹 ∈ (SMblFn‘𝑆)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 207 ∧ wa 396 ∧ w3a 1092 Ⅎwnf 1790 ∈ wcel 2119 ∀wral 3053 {crab 3391 ⊆ wss 3883 ∪ cuni 4839 class class class wbr 5073 dom cdm 5619 ⟶wf 6482 ‘cfv 6486 (class class class)co 7357 ℝcr 11029 ≤ cle 11172 ↾t crest 17375 SAlgcsalg 46759 SMblFncsmblfn 47146 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-10 2152 ax-11 2168 ax-12 2189 ax-ext 2711 ax-rep 5200 ax-sep 5219 ax-nul 5229 ax-pow 5295 ax-pr 5363 ax-un 7679 ax-inf2 9554 ax-cc 10349 ax-ac2 10377 ax-cnex 11086 ax-resscn 11087 ax-1cn 11088 ax-icn 11089 ax-addcl 11090 ax-addrcl 11091 ax-mulcl 11092 ax-mulrcl 11093 ax-mulcom 11094 ax-addass 11095 ax-mulass 11096 ax-distr 11097 ax-i2m1 11098 ax-1ne0 11099 ax-1rid 11100 ax-rnegex 11101 ax-rrecex 11102 ax-cnre 11103 ax-pre-lttri 11104 ax-pre-lttrn 11105 ax-pre-ltadd 11106 ax-pre-mulgt0 11107 ax-pre-sup 11108 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3or 1093 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-nf 1791 df-sb 2074 df-mo 2543 df-eu 2573 df-clab 2718 df-cleq 2731 df-clel 2814 df-nfc 2888 df-ne 2935 df-nel 3039 df-ral 3054 df-rex 3064 df-rmo 3344 df-reu 3345 df-rab 3392 df-v 3433 df-sbc 3724 df-csb 3832 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-pss 3903 df-nul 4263 df-if 4456 df-pw 4532 df-sn 4557 df-pr 4559 df-op 4563 df-uni 4840 df-int 4879 df-iun 4924 df-iin 4925 df-br 5074 df-opab 5136 df-mpt 5155 df-tr 5181 df-id 5514 df-eprel 5519 df-po 5527 df-so 5528 df-fr 5572 df-se 5573 df-we 5574 df-xp 5625 df-rel 5626 df-cnv 5627 df-co 5628 df-dm 5629 df-rn 5630 df-res 5631 df-ima 5632 df-pred 6253 df-ord 6314 df-on 6315 df-lim 6316 df-suc 6317 df-iota 6442 df-fun 6488 df-fn 6489 df-f 6490 df-f1 6491 df-fo 6492 df-f1o 6493 df-fv 6494 df-isom 6495 df-riota 7314 df-ov 7360 df-oprab 7361 df-mpo 7362 df-om 7808 df-1st 7932 df-2nd 7933 df-frecs 8222 df-wrecs 8253 df-recs 8302 df-rdg 8340 df-1o 8396 df-er 8634 df-map 8766 df-pm 8767 df-en 8885 df-dom 8886 df-sdom 8887 df-fin 8888 df-sup 9346 df-inf 9347 df-card 9855 df-acn 9858 df-ac 10030 df-pnf 11173 df-mnf 11174 df-xr 11175 df-ltxr 11176 df-le 11177 df-sub 11371 df-neg 11372 df-div 11800 df-nn 12167 df-n0 12430 df-z 12517 df-uz 12781 df-q 12891 df-rp 12935 df-ioo 13294 df-ico 13296 df-fl 13743 df-rest 17377 df-salg 46760 df-smblfn 47147 |
| This theorem is referenced by: smflim 47228 issmfle2d 47260 |
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