Mathbox for Glauco Siliprandi |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > cnfsmf | Structured version Visualization version GIF version |
Description: A continuous function is measurable. Proposition 121D (b) of [Fremlin1] p. 36 is a special case of this theorem, where the topology on the domain is induced by the standard topology on n-dimensional Real numbers. (Contributed by Glauco Siliprandi, 26-Jun-2021.) |
Ref | Expression |
---|---|
cnfsmf.1 | ⊢ (𝜑 → 𝐽 ∈ Top) |
cnfsmf.k | ⊢ 𝐾 = (topGen‘ran (,)) |
cnfsmf.f | ⊢ (𝜑 → 𝐹 ∈ ((𝐽 ↾t dom 𝐹) Cn 𝐾)) |
cnfsmf.s | ⊢ 𝑆 = (SalGen‘𝐽) |
Ref | Expression |
---|---|
cnfsmf | ⊢ (𝜑 → 𝐹 ∈ (SMblFn‘𝑆)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfv 1915 | . 2 ⊢ Ⅎ𝑎𝜑 | |
2 | cnfsmf.1 | . . 3 ⊢ (𝜑 → 𝐽 ∈ Top) | |
3 | cnfsmf.s | . . 3 ⊢ 𝑆 = (SalGen‘𝐽) | |
4 | 2, 3 | salgencld 42639 | . 2 ⊢ (𝜑 → 𝑆 ∈ SAlg) |
5 | cnfsmf.f | . . . . 5 ⊢ (𝜑 → 𝐹 ∈ ((𝐽 ↾t dom 𝐹) Cn 𝐾)) | |
6 | eqid 2823 | . . . . . 6 ⊢ ∪ (𝐽 ↾t dom 𝐹) = ∪ (𝐽 ↾t dom 𝐹) | |
7 | eqid 2823 | . . . . . 6 ⊢ ∪ 𝐾 = ∪ 𝐾 | |
8 | 6, 7 | cnf 21856 | . . . . 5 ⊢ (𝐹 ∈ ((𝐽 ↾t dom 𝐹) Cn 𝐾) → 𝐹:∪ (𝐽 ↾t dom 𝐹)⟶∪ 𝐾) |
9 | 5, 8 | syl 17 | . . . 4 ⊢ (𝜑 → 𝐹:∪ (𝐽 ↾t dom 𝐹)⟶∪ 𝐾) |
10 | 9 | fdmd 6525 | . . 3 ⊢ (𝜑 → dom 𝐹 = ∪ (𝐽 ↾t dom 𝐹)) |
11 | ovex 7191 | . . . . . . . 8 ⊢ (𝐽 ↾t dom 𝐹) ∈ V | |
12 | 11 | uniex 7469 | . . . . . . 7 ⊢ ∪ (𝐽 ↾t dom 𝐹) ∈ V |
13 | 12 | a1i 11 | . . . . . 6 ⊢ (𝜑 → ∪ (𝐽 ↾t dom 𝐹) ∈ V) |
14 | 10, 13 | eqeltrd 2915 | . . . . 5 ⊢ (𝜑 → dom 𝐹 ∈ V) |
15 | 2, 14 | unirestss 41397 | . . . 4 ⊢ (𝜑 → ∪ (𝐽 ↾t dom 𝐹) ⊆ ∪ 𝐽) |
16 | 3 | sssalgen 42625 | . . . . . 6 ⊢ (𝐽 ∈ Top → 𝐽 ⊆ 𝑆) |
17 | 2, 16 | syl 17 | . . . . 5 ⊢ (𝜑 → 𝐽 ⊆ 𝑆) |
18 | 17 | unissd 4850 | . . . 4 ⊢ (𝜑 → ∪ 𝐽 ⊆ ∪ 𝑆) |
19 | 15, 18 | sstrd 3979 | . . 3 ⊢ (𝜑 → ∪ (𝐽 ↾t dom 𝐹) ⊆ ∪ 𝑆) |
20 | 10, 19 | eqsstrd 4007 | . 2 ⊢ (𝜑 → dom 𝐹 ⊆ ∪ 𝑆) |
21 | uniretop 23373 | . . . . . . 7 ⊢ ℝ = ∪ (topGen‘ran (,)) | |
22 | cnfsmf.k | . . . . . . . 8 ⊢ 𝐾 = (topGen‘ran (,)) | |
23 | 22 | unieqi 4853 | . . . . . . 7 ⊢ ∪ 𝐾 = ∪ (topGen‘ran (,)) |
24 | 21, 23 | eqtr4i 2849 | . . . . . 6 ⊢ ℝ = ∪ 𝐾 |
25 | 24 | a1i 11 | . . . . 5 ⊢ (𝜑 → ℝ = ∪ 𝐾) |
26 | 25 | feq3d 6503 | . . . 4 ⊢ (𝜑 → (𝐹:∪ (𝐽 ↾t dom 𝐹)⟶ℝ ↔ 𝐹:∪ (𝐽 ↾t dom 𝐹)⟶∪ 𝐾)) |
27 | 9, 26 | mpbird 259 | . . 3 ⊢ (𝜑 → 𝐹:∪ (𝐽 ↾t dom 𝐹)⟶ℝ) |
28 | 27 | ffdmd 6539 | . 2 ⊢ (𝜑 → 𝐹:dom 𝐹⟶ℝ) |
29 | ssrest 21786 | . . . . 5 ⊢ ((𝑆 ∈ SAlg ∧ 𝐽 ⊆ 𝑆) → (𝐽 ↾t dom 𝐹) ⊆ (𝑆 ↾t dom 𝐹)) | |
30 | 4, 17, 29 | syl2anc 586 | . . . 4 ⊢ (𝜑 → (𝐽 ↾t dom 𝐹) ⊆ (𝑆 ↾t dom 𝐹)) |
31 | 30 | adantr 483 | . . 3 ⊢ ((𝜑 ∧ 𝑎 ∈ ℝ) → (𝐽 ↾t dom 𝐹) ⊆ (𝑆 ↾t dom 𝐹)) |
32 | 10 | rabeqdv 3486 | . . . . 5 ⊢ (𝜑 → {𝑥 ∈ dom 𝐹 ∣ (𝐹‘𝑥) < 𝑎} = {𝑥 ∈ ∪ (𝐽 ↾t dom 𝐹) ∣ (𝐹‘𝑥) < 𝑎}) |
33 | 32 | adantr 483 | . . . 4 ⊢ ((𝜑 ∧ 𝑎 ∈ ℝ) → {𝑥 ∈ dom 𝐹 ∣ (𝐹‘𝑥) < 𝑎} = {𝑥 ∈ ∪ (𝐽 ↾t dom 𝐹) ∣ (𝐹‘𝑥) < 𝑎}) |
34 | nfcv 2979 | . . . . 5 ⊢ Ⅎ𝑥𝑎 | |
35 | nfcv 2979 | . . . . 5 ⊢ Ⅎ𝑥𝐹 | |
36 | nfv 1915 | . . . . 5 ⊢ Ⅎ𝑥(𝜑 ∧ 𝑎 ∈ ℝ) | |
37 | eqid 2823 | . . . . 5 ⊢ {𝑥 ∈ ∪ (𝐽 ↾t dom 𝐹) ∣ (𝐹‘𝑥) < 𝑎} = {𝑥 ∈ ∪ (𝐽 ↾t dom 𝐹) ∣ (𝐹‘𝑥) < 𝑎} | |
38 | rexr 10689 | . . . . . 6 ⊢ (𝑎 ∈ ℝ → 𝑎 ∈ ℝ*) | |
39 | 38 | adantl 484 | . . . . 5 ⊢ ((𝜑 ∧ 𝑎 ∈ ℝ) → 𝑎 ∈ ℝ*) |
40 | 5 | adantr 483 | . . . . 5 ⊢ ((𝜑 ∧ 𝑎 ∈ ℝ) → 𝐹 ∈ ((𝐽 ↾t dom 𝐹) Cn 𝐾)) |
41 | 34, 35, 36, 22, 6, 37, 39, 40 | rfcnpre2 41295 | . . . 4 ⊢ ((𝜑 ∧ 𝑎 ∈ ℝ) → {𝑥 ∈ ∪ (𝐽 ↾t dom 𝐹) ∣ (𝐹‘𝑥) < 𝑎} ∈ (𝐽 ↾t dom 𝐹)) |
42 | 33, 41 | eqeltrd 2915 | . . 3 ⊢ ((𝜑 ∧ 𝑎 ∈ ℝ) → {𝑥 ∈ dom 𝐹 ∣ (𝐹‘𝑥) < 𝑎} ∈ (𝐽 ↾t dom 𝐹)) |
43 | 31, 42 | sseldd 3970 | . 2 ⊢ ((𝜑 ∧ 𝑎 ∈ ℝ) → {𝑥 ∈ dom 𝐹 ∣ (𝐹‘𝑥) < 𝑎} ∈ (𝑆 ↾t dom 𝐹)) |
44 | 1, 4, 20, 28, 43 | issmfd 43019 | 1 ⊢ (𝜑 → 𝐹 ∈ (SMblFn‘𝑆)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 398 = wceq 1537 ∈ wcel 2114 {crab 3144 Vcvv 3496 ⊆ wss 3938 ∪ cuni 4840 class class class wbr 5068 dom cdm 5557 ran crn 5558 ⟶wf 6353 ‘cfv 6357 (class class class)co 7158 ℝcr 10538 ℝ*cxr 10676 < clt 10677 (,)cioo 12741 ↾t crest 16696 topGenctg 16713 Topctop 21503 Cn ccn 21834 SAlgcsalg 42600 SalGencsalgen 42604 SMblFncsmblfn 42984 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 ax-rep 5192 ax-sep 5205 ax-nul 5212 ax-pow 5268 ax-pr 5332 ax-un 7463 ax-cnex 10595 ax-resscn 10596 ax-1cn 10597 ax-icn 10598 ax-addcl 10599 ax-addrcl 10600 ax-mulcl 10601 ax-mulrcl 10602 ax-mulcom 10603 ax-addass 10604 ax-mulass 10605 ax-distr 10606 ax-i2m1 10607 ax-1ne0 10608 ax-1rid 10609 ax-rnegex 10610 ax-rrecex 10611 ax-cnre 10612 ax-pre-lttri 10613 ax-pre-lttrn 10614 ax-pre-ltadd 10615 ax-pre-mulgt0 10616 ax-pre-sup 10617 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ne 3019 df-nel 3126 df-ral 3145 df-rex 3146 df-reu 3147 df-rmo 3148 df-rab 3149 df-v 3498 df-sbc 3775 df-csb 3886 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-pss 3956 df-nul 4294 df-if 4470 df-pw 4543 df-sn 4570 df-pr 4572 df-tp 4574 df-op 4576 df-uni 4841 df-int 4879 df-iun 4923 df-br 5069 df-opab 5131 df-mpt 5149 df-tr 5175 df-id 5462 df-eprel 5467 df-po 5476 df-so 5477 df-fr 5516 df-we 5518 df-xp 5563 df-rel 5564 df-cnv 5565 df-co 5566 df-dm 5567 df-rn 5568 df-res 5569 df-ima 5570 df-pred 6150 df-ord 6196 df-on 6197 df-lim 6198 df-suc 6199 df-iota 6316 df-fun 6359 df-fn 6360 df-f 6361 df-f1 6362 df-fo 6363 df-f1o 6364 df-fv 6365 df-riota 7116 df-ov 7161 df-oprab 7162 df-mpo 7163 df-om 7583 df-1st 7691 df-2nd 7692 df-wrecs 7949 df-recs 8010 df-rdg 8048 df-er 8291 df-map 8410 df-pm 8411 df-en 8512 df-dom 8513 df-sdom 8514 df-sup 8908 df-inf 8909 df-pnf 10679 df-mnf 10680 df-xr 10681 df-ltxr 10682 df-le 10683 df-sub 10874 df-neg 10875 df-div 11300 df-nn 11641 df-n0 11901 df-z 11985 df-uz 12247 df-q 12352 df-ioo 12745 df-ico 12747 df-rest 16698 df-topgen 16719 df-top 21504 df-topon 21521 df-bases 21556 df-cn 21837 df-salg 42601 df-salgen 42605 df-smblfn 42985 |
This theorem is referenced by: cnfrrnsmf 43035 |
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