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Mirrors > Home > MPE Home > Th. List > ismbfcn2 | 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, 13-Aug-2014.) |
Ref | Expression |
---|---|
ismbfcn2.1 | ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℂ) |
Ref | Expression |
---|---|
ismbfcn2 | ⊢ (𝜑 → ((𝑥 ∈ 𝐴 ↦ 𝐵) ∈ MblFn ↔ ((𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵)) ∈ MblFn ∧ (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵)) ∈ MblFn))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ismbfcn2.1 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℂ) | |
2 | 1 | fmpttd 6633 | . . 3 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ 𝐵):𝐴⟶ℂ) |
3 | ismbfcn 23794 | . . 3 ⊢ ((𝑥 ∈ 𝐴 ↦ 𝐵):𝐴⟶ℂ → ((𝑥 ∈ 𝐴 ↦ 𝐵) ∈ MblFn ↔ ((ℜ ∘ (𝑥 ∈ 𝐴 ↦ 𝐵)) ∈ MblFn ∧ (ℑ ∘ (𝑥 ∈ 𝐴 ↦ 𝐵)) ∈ MblFn))) | |
4 | 2, 3 | syl 17 | . 2 ⊢ (𝜑 → ((𝑥 ∈ 𝐴 ↦ 𝐵) ∈ MblFn ↔ ((ℜ ∘ (𝑥 ∈ 𝐴 ↦ 𝐵)) ∈ MblFn ∧ (ℑ ∘ (𝑥 ∈ 𝐴 ↦ 𝐵)) ∈ MblFn))) |
5 | eqidd 2825 | . . . . 5 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ 𝐵) = (𝑥 ∈ 𝐴 ↦ 𝐵)) | |
6 | ref 14228 | . . . . . . 7 ⊢ ℜ:ℂ⟶ℝ | |
7 | 6 | a1i 11 | . . . . . 6 ⊢ (𝜑 → ℜ:ℂ⟶ℝ) |
8 | 7 | feqmptd 6495 | . . . . 5 ⊢ (𝜑 → ℜ = (𝑦 ∈ ℂ ↦ (ℜ‘𝑦))) |
9 | fveq2 6432 | . . . . 5 ⊢ (𝑦 = 𝐵 → (ℜ‘𝑦) = (ℜ‘𝐵)) | |
10 | 1, 5, 8, 9 | fmptco 6645 | . . . 4 ⊢ (𝜑 → (ℜ ∘ (𝑥 ∈ 𝐴 ↦ 𝐵)) = (𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵))) |
11 | 10 | eleq1d 2890 | . . 3 ⊢ (𝜑 → ((ℜ ∘ (𝑥 ∈ 𝐴 ↦ 𝐵)) ∈ MblFn ↔ (𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵)) ∈ MblFn)) |
12 | imf 14229 | . . . . . . 7 ⊢ ℑ:ℂ⟶ℝ | |
13 | 12 | a1i 11 | . . . . . 6 ⊢ (𝜑 → ℑ:ℂ⟶ℝ) |
14 | 13 | feqmptd 6495 | . . . . 5 ⊢ (𝜑 → ℑ = (𝑦 ∈ ℂ ↦ (ℑ‘𝑦))) |
15 | fveq2 6432 | . . . . 5 ⊢ (𝑦 = 𝐵 → (ℑ‘𝑦) = (ℑ‘𝐵)) | |
16 | 1, 5, 14, 15 | fmptco 6645 | . . . 4 ⊢ (𝜑 → (ℑ ∘ (𝑥 ∈ 𝐴 ↦ 𝐵)) = (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵))) |
17 | 16 | eleq1d 2890 | . . 3 ⊢ (𝜑 → ((ℑ ∘ (𝑥 ∈ 𝐴 ↦ 𝐵)) ∈ MblFn ↔ (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵)) ∈ MblFn)) |
18 | 11, 17 | anbi12d 626 | . 2 ⊢ (𝜑 → (((ℜ ∘ (𝑥 ∈ 𝐴 ↦ 𝐵)) ∈ MblFn ∧ (ℑ ∘ (𝑥 ∈ 𝐴 ↦ 𝐵)) ∈ MblFn) ↔ ((𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵)) ∈ MblFn ∧ (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵)) ∈ MblFn))) |
19 | 4, 18 | bitrd 271 | 1 ⊢ (𝜑 → ((𝑥 ∈ 𝐴 ↦ 𝐵) ∈ MblFn ↔ ((𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵)) ∈ MblFn ∧ (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵)) ∈ MblFn))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 198 ∧ wa 386 ∈ wcel 2166 ↦ cmpt 4951 ∘ ccom 5345 ⟶wf 6118 ‘cfv 6122 ℂcc 10249 ℝcr 10250 ℜcre 14213 ℑcim 14214 MblFncmbf 23779 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1896 ax-4 1910 ax-5 2011 ax-6 2077 ax-7 2114 ax-8 2168 ax-9 2175 ax-10 2194 ax-11 2209 ax-12 2222 ax-13 2390 ax-ext 2802 ax-rep 4993 ax-sep 5004 ax-nul 5012 ax-pow 5064 ax-pr 5126 ax-un 7208 ax-inf2 8814 ax-cnex 10307 ax-resscn 10308 ax-1cn 10309 ax-icn 10310 ax-addcl 10311 ax-addrcl 10312 ax-mulcl 10313 ax-mulrcl 10314 ax-mulcom 10315 ax-addass 10316 ax-mulass 10317 ax-distr 10318 ax-i2m1 10319 ax-1ne0 10320 ax-1rid 10321 ax-rnegex 10322 ax-rrecex 10323 ax-cnre 10324 ax-pre-lttri 10325 ax-pre-lttrn 10326 ax-pre-ltadd 10327 ax-pre-mulgt0 10328 ax-pre-sup 10329 |
This theorem depends on definitions: df-bi 199 df-an 387 df-or 881 df-3or 1114 df-3an 1115 df-tru 1662 df-fal 1672 df-ex 1881 df-nf 1885 df-sb 2070 df-mo 2604 df-eu 2639 df-clab 2811 df-cleq 2817 df-clel 2820 df-nfc 2957 df-ne 2999 df-nel 3102 df-ral 3121 df-rex 3122 df-reu 3123 df-rmo 3124 df-rab 3125 df-v 3415 df-sbc 3662 df-csb 3757 df-dif 3800 df-un 3802 df-in 3804 df-ss 3811 df-pss 3813 df-nul 4144 df-if 4306 df-pw 4379 df-sn 4397 df-pr 4399 df-tp 4401 df-op 4403 df-uni 4658 df-int 4697 df-iun 4741 df-br 4873 df-opab 4935 df-mpt 4952 df-tr 4975 df-id 5249 df-eprel 5254 df-po 5262 df-so 5263 df-fr 5300 df-se 5301 df-we 5302 df-xp 5347 df-rel 5348 df-cnv 5349 df-co 5350 df-dm 5351 df-rn 5352 df-res 5353 df-ima 5354 df-pred 5919 df-ord 5965 df-on 5966 df-lim 5967 df-suc 5968 df-iota 6085 df-fun 6124 df-fn 6125 df-f 6126 df-f1 6127 df-fo 6128 df-f1o 6129 df-fv 6130 df-isom 6131 df-riota 6865 df-ov 6907 df-oprab 6908 df-mpt2 6909 df-of 7156 df-om 7326 df-1st 7427 df-2nd 7428 df-wrecs 7671 df-recs 7733 df-rdg 7771 df-1o 7825 df-2o 7826 df-oadd 7829 df-er 8008 df-map 8123 df-pm 8124 df-en 8222 df-dom 8223 df-sdom 8224 df-fin 8225 df-sup 8616 df-inf 8617 df-oi 8683 df-card 9077 df-cda 9304 df-pnf 10392 df-mnf 10393 df-xr 10394 df-ltxr 10395 df-le 10396 df-sub 10586 df-neg 10587 df-div 11009 df-nn 11350 df-2 11413 df-3 11414 df-n0 11618 df-z 11704 df-uz 11968 df-q 12071 df-rp 12112 df-xadd 12232 df-ioo 12466 df-ico 12468 df-icc 12469 df-fz 12619 df-fzo 12760 df-fl 12887 df-seq 13095 df-exp 13154 df-hash 13410 df-cj 14215 df-re 14216 df-im 14217 df-sqrt 14351 df-abs 14352 df-clim 14595 df-sum 14793 df-xmet 20098 df-met 20099 df-ovol 23629 df-vol 23630 df-mbf 23784 |
This theorem is referenced by: mbfeqa 23808 mbfss 23811 mbfmulc2re 23813 mbfadd 23826 mbfmulc2 23828 mbflim 23833 mbfmul 23891 iblcn 23963 ibladd 23985 ibladdnc 34009 ftc1anclem2 34028 ftc1anclem5 34031 ftc1anclem6 34032 ftc1anclem8 34034 |
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