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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 7134 | . . 3 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ 𝐵):𝐴⟶ℂ) | 
| 3 | ismbfcn 25665 | . . 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 | ref 15152 | . . . . . 6 ⊢ ℜ:ℂ⟶ℝ | |
| 6 | 5 | a1i 11 | . . . . 5 ⊢ (𝜑 → ℜ:ℂ⟶ℝ) | 
| 7 | 6, 1 | cofmpt 7151 | . . . 4 ⊢ (𝜑 → (ℜ ∘ (𝑥 ∈ 𝐴 ↦ 𝐵)) = (𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵))) | 
| 8 | 7 | eleq1d 2825 | . . 3 ⊢ (𝜑 → ((ℜ ∘ (𝑥 ∈ 𝐴 ↦ 𝐵)) ∈ MblFn ↔ (𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵)) ∈ MblFn)) | 
| 9 | imf 15153 | . . . . . 6 ⊢ ℑ:ℂ⟶ℝ | |
| 10 | 9 | a1i 11 | . . . . 5 ⊢ (𝜑 → ℑ:ℂ⟶ℝ) | 
| 11 | 10, 1 | cofmpt 7151 | . . . 4 ⊢ (𝜑 → (ℑ ∘ (𝑥 ∈ 𝐴 ↦ 𝐵)) = (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵))) | 
| 12 | 11 | eleq1d 2825 | . . 3 ⊢ (𝜑 → ((ℑ ∘ (𝑥 ∈ 𝐴 ↦ 𝐵)) ∈ MblFn ↔ (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵)) ∈ MblFn)) | 
| 13 | 8, 12 | anbi12d 632 | . 2 ⊢ (𝜑 → (((ℜ ∘ (𝑥 ∈ 𝐴 ↦ 𝐵)) ∈ MblFn ∧ (ℑ ∘ (𝑥 ∈ 𝐴 ↦ 𝐵)) ∈ MblFn) ↔ ((𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵)) ∈ MblFn ∧ (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵)) ∈ MblFn))) | 
| 14 | 4, 13 | bitrd 279 | 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 206 ∧ wa 395 ∈ wcel 2107 ↦ cmpt 5224 ∘ ccom 5688 ⟶wf 6556 ‘cfv 6560 ℂcc 11154 ℝcr 11155 ℜcre 15137 ℑcim 15138 MblFncmbf 25650 | 
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1794 ax-4 1808 ax-5 1909 ax-6 1966 ax-7 2006 ax-8 2109 ax-9 2117 ax-10 2140 ax-11 2156 ax-12 2176 ax-ext 2707 ax-rep 5278 ax-sep 5295 ax-nul 5305 ax-pow 5364 ax-pr 5431 ax-un 7756 ax-inf2 9682 ax-cnex 11212 ax-resscn 11213 ax-1cn 11214 ax-icn 11215 ax-addcl 11216 ax-addrcl 11217 ax-mulcl 11218 ax-mulrcl 11219 ax-mulcom 11220 ax-addass 11221 ax-mulass 11222 ax-distr 11223 ax-i2m1 11224 ax-1ne0 11225 ax-1rid 11226 ax-rnegex 11227 ax-rrecex 11228 ax-cnre 11229 ax-pre-lttri 11230 ax-pre-lttrn 11231 ax-pre-ltadd 11232 ax-pre-mulgt0 11233 ax-pre-sup 11234 | 
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1779 df-nf 1783 df-sb 2064 df-mo 2539 df-eu 2568 df-clab 2714 df-cleq 2728 df-clel 2815 df-nfc 2891 df-ne 2940 df-nel 3046 df-ral 3061 df-rex 3070 df-rmo 3379 df-reu 3380 df-rab 3436 df-v 3481 df-sbc 3788 df-csb 3899 df-dif 3953 df-un 3955 df-in 3957 df-ss 3967 df-pss 3970 df-nul 4333 df-if 4525 df-pw 4601 df-sn 4626 df-pr 4628 df-op 4632 df-uni 4907 df-int 4946 df-iun 4992 df-br 5143 df-opab 5205 df-mpt 5225 df-tr 5259 df-id 5577 df-eprel 5583 df-po 5591 df-so 5592 df-fr 5636 df-se 5637 df-we 5638 df-xp 5690 df-rel 5691 df-cnv 5692 df-co 5693 df-dm 5694 df-rn 5695 df-res 5696 df-ima 5697 df-pred 6320 df-ord 6386 df-on 6387 df-lim 6388 df-suc 6389 df-iota 6513 df-fun 6562 df-fn 6563 df-f 6564 df-f1 6565 df-fo 6566 df-f1o 6567 df-fv 6568 df-isom 6569 df-riota 7389 df-ov 7435 df-oprab 7436 df-mpo 7437 df-of 7698 df-om 7889 df-1st 8015 df-2nd 8016 df-frecs 8307 df-wrecs 8338 df-recs 8412 df-rdg 8451 df-1o 8507 df-2o 8508 df-er 8746 df-map 8869 df-pm 8870 df-en 8987 df-dom 8988 df-sdom 8989 df-fin 8990 df-sup 9483 df-inf 9484 df-oi 9551 df-dju 9942 df-card 9980 df-pnf 11298 df-mnf 11299 df-xr 11300 df-ltxr 11301 df-le 11302 df-sub 11495 df-neg 11496 df-div 11922 df-nn 12268 df-2 12330 df-3 12331 df-n0 12529 df-z 12616 df-uz 12880 df-q 12992 df-rp 13036 df-xadd 13156 df-ioo 13392 df-ico 13394 df-icc 13395 df-fz 13549 df-fzo 13696 df-fl 13833 df-seq 14044 df-exp 14104 df-hash 14371 df-cj 15139 df-re 15140 df-im 15141 df-sqrt 15275 df-abs 15276 df-clim 15525 df-sum 15724 df-xmet 21358 df-met 21359 df-ovol 25500 df-vol 25501 df-mbf 25655 | 
| This theorem is referenced by: mbfeqa 25679 mbfss 25682 mbfmulc2re 25684 mbfadd 25697 mbfmulc2 25699 mbflim 25704 mbfmul 25762 iblcn 25835 ibladd 25857 ibladdnc 37685 ftc1anclem2 37702 ftc1anclem5 37705 ftc1anclem6 37706 ftc1anclem8 37708 | 
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