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Mirrors > Home > MPE Home > Th. List > ismbfcn | Structured version Visualization version GIF version |
Description: A complex function is measurable iff the real and imaginary components of the function are measurable. (Contributed by Mario Carneiro, 17-Jun-2014.) |
Ref | Expression |
---|---|
ismbfcn | ⊢ (𝐹:𝐴⟶ℂ → (𝐹 ∈ MblFn ↔ ((ℜ ∘ 𝐹) ∈ MblFn ∧ (ℑ ∘ 𝐹) ∈ MblFn))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | mbfdm 24790 | . . 3 ⊢ (𝐹 ∈ MblFn → dom 𝐹 ∈ dom vol) | |
2 | fdm 6609 | . . . 4 ⊢ (𝐹:𝐴⟶ℂ → dom 𝐹 = 𝐴) | |
3 | 2 | eleq1d 2823 | . . 3 ⊢ (𝐹:𝐴⟶ℂ → (dom 𝐹 ∈ dom vol ↔ 𝐴 ∈ dom vol)) |
4 | 1, 3 | syl5ib 243 | . 2 ⊢ (𝐹:𝐴⟶ℂ → (𝐹 ∈ MblFn → 𝐴 ∈ dom vol)) |
5 | mbfdm 24790 | . . . 4 ⊢ ((ℜ ∘ 𝐹) ∈ MblFn → dom (ℜ ∘ 𝐹) ∈ dom vol) | |
6 | 5 | adantr 481 | . . 3 ⊢ (((ℜ ∘ 𝐹) ∈ MblFn ∧ (ℑ ∘ 𝐹) ∈ MblFn) → dom (ℜ ∘ 𝐹) ∈ dom vol) |
7 | ref 14823 | . . . . . 6 ⊢ ℜ:ℂ⟶ℝ | |
8 | fco 6624 | . . . . . 6 ⊢ ((ℜ:ℂ⟶ℝ ∧ 𝐹:𝐴⟶ℂ) → (ℜ ∘ 𝐹):𝐴⟶ℝ) | |
9 | 7, 8 | mpan 687 | . . . . 5 ⊢ (𝐹:𝐴⟶ℂ → (ℜ ∘ 𝐹):𝐴⟶ℝ) |
10 | 9 | fdmd 6611 | . . . 4 ⊢ (𝐹:𝐴⟶ℂ → dom (ℜ ∘ 𝐹) = 𝐴) |
11 | 10 | eleq1d 2823 | . . 3 ⊢ (𝐹:𝐴⟶ℂ → (dom (ℜ ∘ 𝐹) ∈ dom vol ↔ 𝐴 ∈ dom vol)) |
12 | 6, 11 | syl5ib 243 | . 2 ⊢ (𝐹:𝐴⟶ℂ → (((ℜ ∘ 𝐹) ∈ MblFn ∧ (ℑ ∘ 𝐹) ∈ MblFn) → 𝐴 ∈ dom vol)) |
13 | ismbf1 24788 | . . . 4 ⊢ (𝐹 ∈ MblFn ↔ (𝐹 ∈ (ℂ ↑pm ℝ) ∧ ∀𝑥 ∈ ran (,)((◡(ℜ ∘ 𝐹) “ 𝑥) ∈ dom vol ∧ (◡(ℑ ∘ 𝐹) “ 𝑥) ∈ dom vol))) | |
14 | 9 | adantr 481 | . . . . . . . 8 ⊢ ((𝐹:𝐴⟶ℂ ∧ 𝐴 ∈ dom vol) → (ℜ ∘ 𝐹):𝐴⟶ℝ) |
15 | ismbf 24792 | . . . . . . . 8 ⊢ ((ℜ ∘ 𝐹):𝐴⟶ℝ → ((ℜ ∘ 𝐹) ∈ MblFn ↔ ∀𝑥 ∈ ran (,)(◡(ℜ ∘ 𝐹) “ 𝑥) ∈ dom vol)) | |
16 | 14, 15 | syl 17 | . . . . . . 7 ⊢ ((𝐹:𝐴⟶ℂ ∧ 𝐴 ∈ dom vol) → ((ℜ ∘ 𝐹) ∈ MblFn ↔ ∀𝑥 ∈ ran (,)(◡(ℜ ∘ 𝐹) “ 𝑥) ∈ dom vol)) |
17 | imf 14824 | . . . . . . . . . 10 ⊢ ℑ:ℂ⟶ℝ | |
18 | fco 6624 | . . . . . . . . . 10 ⊢ ((ℑ:ℂ⟶ℝ ∧ 𝐹:𝐴⟶ℂ) → (ℑ ∘ 𝐹):𝐴⟶ℝ) | |
19 | 17, 18 | mpan 687 | . . . . . . . . 9 ⊢ (𝐹:𝐴⟶ℂ → (ℑ ∘ 𝐹):𝐴⟶ℝ) |
20 | 19 | adantr 481 | . . . . . . . 8 ⊢ ((𝐹:𝐴⟶ℂ ∧ 𝐴 ∈ dom vol) → (ℑ ∘ 𝐹):𝐴⟶ℝ) |
21 | ismbf 24792 | . . . . . . . 8 ⊢ ((ℑ ∘ 𝐹):𝐴⟶ℝ → ((ℑ ∘ 𝐹) ∈ MblFn ↔ ∀𝑥 ∈ ran (,)(◡(ℑ ∘ 𝐹) “ 𝑥) ∈ dom vol)) | |
22 | 20, 21 | syl 17 | . . . . . . 7 ⊢ ((𝐹:𝐴⟶ℂ ∧ 𝐴 ∈ dom vol) → ((ℑ ∘ 𝐹) ∈ MblFn ↔ ∀𝑥 ∈ ran (,)(◡(ℑ ∘ 𝐹) “ 𝑥) ∈ dom vol)) |
23 | 16, 22 | anbi12d 631 | . . . . . 6 ⊢ ((𝐹:𝐴⟶ℂ ∧ 𝐴 ∈ dom vol) → (((ℜ ∘ 𝐹) ∈ MblFn ∧ (ℑ ∘ 𝐹) ∈ MblFn) ↔ (∀𝑥 ∈ ran (,)(◡(ℜ ∘ 𝐹) “ 𝑥) ∈ dom vol ∧ ∀𝑥 ∈ ran (,)(◡(ℑ ∘ 𝐹) “ 𝑥) ∈ dom vol))) |
24 | r19.26 3095 | . . . . . 6 ⊢ (∀𝑥 ∈ ran (,)((◡(ℜ ∘ 𝐹) “ 𝑥) ∈ dom vol ∧ (◡(ℑ ∘ 𝐹) “ 𝑥) ∈ dom vol) ↔ (∀𝑥 ∈ ran (,)(◡(ℜ ∘ 𝐹) “ 𝑥) ∈ dom vol ∧ ∀𝑥 ∈ ran (,)(◡(ℑ ∘ 𝐹) “ 𝑥) ∈ dom vol)) | |
25 | 23, 24 | bitr4di 289 | . . . . 5 ⊢ ((𝐹:𝐴⟶ℂ ∧ 𝐴 ∈ dom vol) → (((ℜ ∘ 𝐹) ∈ MblFn ∧ (ℑ ∘ 𝐹) ∈ MblFn) ↔ ∀𝑥 ∈ ran (,)((◡(ℜ ∘ 𝐹) “ 𝑥) ∈ dom vol ∧ (◡(ℑ ∘ 𝐹) “ 𝑥) ∈ dom vol))) |
26 | mblss 24695 | . . . . . . 7 ⊢ (𝐴 ∈ dom vol → 𝐴 ⊆ ℝ) | |
27 | cnex 10952 | . . . . . . . 8 ⊢ ℂ ∈ V | |
28 | reex 10962 | . . . . . . . 8 ⊢ ℝ ∈ V | |
29 | elpm2r 8633 | . . . . . . . 8 ⊢ (((ℂ ∈ V ∧ ℝ ∈ V) ∧ (𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ ℝ)) → 𝐹 ∈ (ℂ ↑pm ℝ)) | |
30 | 27, 28, 29 | mpanl12 699 | . . . . . . 7 ⊢ ((𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ ℝ) → 𝐹 ∈ (ℂ ↑pm ℝ)) |
31 | 26, 30 | sylan2 593 | . . . . . 6 ⊢ ((𝐹:𝐴⟶ℂ ∧ 𝐴 ∈ dom vol) → 𝐹 ∈ (ℂ ↑pm ℝ)) |
32 | 31 | biantrurd 533 | . . . . 5 ⊢ ((𝐹:𝐴⟶ℂ ∧ 𝐴 ∈ dom vol) → (∀𝑥 ∈ ran (,)((◡(ℜ ∘ 𝐹) “ 𝑥) ∈ dom vol ∧ (◡(ℑ ∘ 𝐹) “ 𝑥) ∈ dom vol) ↔ (𝐹 ∈ (ℂ ↑pm ℝ) ∧ ∀𝑥 ∈ ran (,)((◡(ℜ ∘ 𝐹) “ 𝑥) ∈ dom vol ∧ (◡(ℑ ∘ 𝐹) “ 𝑥) ∈ dom vol)))) |
33 | 25, 32 | bitrd 278 | . . . 4 ⊢ ((𝐹:𝐴⟶ℂ ∧ 𝐴 ∈ dom vol) → (((ℜ ∘ 𝐹) ∈ MblFn ∧ (ℑ ∘ 𝐹) ∈ MblFn) ↔ (𝐹 ∈ (ℂ ↑pm ℝ) ∧ ∀𝑥 ∈ ran (,)((◡(ℜ ∘ 𝐹) “ 𝑥) ∈ dom vol ∧ (◡(ℑ ∘ 𝐹) “ 𝑥) ∈ dom vol)))) |
34 | 13, 33 | bitr4id 290 | . . 3 ⊢ ((𝐹:𝐴⟶ℂ ∧ 𝐴 ∈ dom vol) → (𝐹 ∈ MblFn ↔ ((ℜ ∘ 𝐹) ∈ MblFn ∧ (ℑ ∘ 𝐹) ∈ MblFn))) |
35 | 34 | ex 413 | . 2 ⊢ (𝐹:𝐴⟶ℂ → (𝐴 ∈ dom vol → (𝐹 ∈ MblFn ↔ ((ℜ ∘ 𝐹) ∈ MblFn ∧ (ℑ ∘ 𝐹) ∈ MblFn)))) |
36 | 4, 12, 35 | pm5.21ndd 381 | 1 ⊢ (𝐹:𝐴⟶ℂ → (𝐹 ∈ MblFn ↔ ((ℜ ∘ 𝐹) ∈ MblFn ∧ (ℑ ∘ 𝐹) ∈ MblFn))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 ∈ wcel 2106 ∀wral 3064 Vcvv 3432 ⊆ wss 3887 ◡ccnv 5588 dom cdm 5589 ran crn 5590 “ cima 5592 ∘ ccom 5593 ⟶wf 6429 (class class class)co 7275 ↑pm cpm 8616 ℂcc 10869 ℝcr 10870 (,)cioo 13079 ℜcre 14808 ℑcim 14809 volcvol 24627 MblFncmbf 24778 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 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 2709 ax-rep 5209 ax-sep 5223 ax-nul 5230 ax-pow 5288 ax-pr 5352 ax-un 7588 ax-inf2 9399 ax-cnex 10927 ax-resscn 10928 ax-1cn 10929 ax-icn 10930 ax-addcl 10931 ax-addrcl 10932 ax-mulcl 10933 ax-mulrcl 10934 ax-mulcom 10935 ax-addass 10936 ax-mulass 10937 ax-distr 10938 ax-i2m1 10939 ax-1ne0 10940 ax-1rid 10941 ax-rnegex 10942 ax-rrecex 10943 ax-cnre 10944 ax-pre-lttri 10945 ax-pre-lttrn 10946 ax-pre-ltadd 10947 ax-pre-mulgt0 10948 ax-pre-sup 10949 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2068 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-nfc 2889 df-ne 2944 df-nel 3050 df-ral 3069 df-rex 3070 df-rmo 3071 df-reu 3072 df-rab 3073 df-v 3434 df-sbc 3717 df-csb 3833 df-dif 3890 df-un 3892 df-in 3894 df-ss 3904 df-pss 3906 df-nul 4257 df-if 4460 df-pw 4535 df-sn 4562 df-pr 4564 df-op 4568 df-uni 4840 df-int 4880 df-iun 4926 df-br 5075 df-opab 5137 df-mpt 5158 df-tr 5192 df-id 5489 df-eprel 5495 df-po 5503 df-so 5504 df-fr 5544 df-se 5545 df-we 5546 df-xp 5595 df-rel 5596 df-cnv 5597 df-co 5598 df-dm 5599 df-rn 5600 df-res 5601 df-ima 5602 df-pred 6202 df-ord 6269 df-on 6270 df-lim 6271 df-suc 6272 df-iota 6391 df-fun 6435 df-fn 6436 df-f 6437 df-f1 6438 df-fo 6439 df-f1o 6440 df-fv 6441 df-isom 6442 df-riota 7232 df-ov 7278 df-oprab 7279 df-mpo 7280 df-of 7533 df-om 7713 df-1st 7831 df-2nd 7832 df-frecs 8097 df-wrecs 8128 df-recs 8202 df-rdg 8241 df-1o 8297 df-2o 8298 df-er 8498 df-map 8617 df-pm 8618 df-en 8734 df-dom 8735 df-sdom 8736 df-fin 8737 df-sup 9201 df-inf 9202 df-oi 9269 df-dju 9659 df-card 9697 df-pnf 11011 df-mnf 11012 df-xr 11013 df-ltxr 11014 df-le 11015 df-sub 11207 df-neg 11208 df-div 11633 df-nn 11974 df-2 12036 df-3 12037 df-n0 12234 df-z 12320 df-uz 12583 df-q 12689 df-rp 12731 df-xadd 12849 df-ioo 13083 df-ico 13085 df-icc 13086 df-fz 13240 df-fzo 13383 df-fl 13512 df-seq 13722 df-exp 13783 df-hash 14045 df-cj 14810 df-re 14811 df-im 14812 df-sqrt 14946 df-abs 14947 df-clim 15197 df-sum 15398 df-xmet 20590 df-met 20591 df-ovol 24628 df-vol 24629 df-mbf 24783 |
This theorem is referenced by: ismbfcn2 24802 mbfres 24808 mbfimaopnlem 24819 mbfresfi 35823 itgaddnc 35837 itgmulc2nc 35845 ftc1anclem5 35854 mbfres2cn 43499 |
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