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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 7108 | . . 3 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ 𝐵):𝐴⟶ℂ) |
| 3 | ismbfcn 25753 | . . 3 ⊢ ((𝑥 ∈ 𝐴 ↦ 𝐵):𝐴⟶ℂ → ((𝑥 ∈ 𝐴 ↦ 𝐵) ∈ MblFn ↔ ((ℜ ∘ (𝑥 ∈ 𝐴 ↦ 𝐵)) ∈ MblFn ∧ (ℑ ∘ (𝑥 ∈ 𝐴 ↦ 𝐵)) ∈ MblFn))) | |
| 4 | 2, 3 | syl 18 | . 2 ⊢ (𝜑 → ((𝑥 ∈ 𝐴 ↦ 𝐵) ∈ MblFn ↔ ((ℜ ∘ (𝑥 ∈ 𝐴 ↦ 𝐵)) ∈ MblFn ∧ (ℑ ∘ (𝑥 ∈ 𝐴 ↦ 𝐵)) ∈ MblFn))) |
| 5 | ref 15159 | . . . . . 6 ⊢ ℜ:ℂ⟶ℝ | |
| 6 | 5 | a1i 11 | . . . . 5 ⊢ (𝜑 → ℜ:ℂ⟶ℝ) |
| 7 | 6, 1 | cofmpt 7126 | . . . 4 ⊢ (𝜑 → (ℜ ∘ (𝑥 ∈ 𝐴 ↦ 𝐵)) = (𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵))) |
| 8 | 7 | eleq1d 2854 | . . 3 ⊢ (𝜑 → ((ℜ ∘ (𝑥 ∈ 𝐴 ↦ 𝐵)) ∈ MblFn ↔ (𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵)) ∈ MblFn)) |
| 9 | imf 15160 | . . . . . 6 ⊢ ℑ:ℂ⟶ℝ | |
| 10 | 9 | a1i 11 | . . . . 5 ⊢ (𝜑 → ℑ:ℂ⟶ℝ) |
| 11 | 10, 1 | cofmpt 7126 | . . . 4 ⊢ (𝜑 → (ℑ ∘ (𝑥 ∈ 𝐴 ↦ 𝐵)) = (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵))) |
| 12 | 11 | eleq1d 2854 | . . 3 ⊢ (𝜑 → ((ℑ ∘ (𝑥 ∈ 𝐴 ↦ 𝐵)) ∈ MblFn ↔ (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵)) ∈ MblFn)) |
| 13 | 8, 12 | anbi12d 643 | . 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 282 | 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 209 ∧ wa 400 ∈ wcel 2149 ↦ cmpt 5193 ∘ ccom 5663 ⟶wf 6530 ‘cfv 6534 ℂcc 11094 ℝcr 11095 ℜcre 15144 ℑcim 15145 MblFncmbf 25738 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-10 2182 ax-11 2198 ax-12 2219 ax-ext 2741 ax-rep 5239 ax-sep 5258 ax-nul 5268 ax-pow 5334 ax-pr 5402 ax-un 7730 ax-inf2 9606 ax-cnex 11152 ax-resscn 11153 ax-1cn 11154 ax-icn 11155 ax-addcl 11156 ax-addrcl 11157 ax-mulcl 11158 ax-mulrcl 11159 ax-mulcom 11160 ax-addass 11161 ax-mulass 11162 ax-distr 11163 ax-i2m1 11164 ax-1ne0 11165 ax-1rid 11166 ax-rnegex 11167 ax-rrecex 11168 ax-cnre 11169 ax-pre-lttri 11170 ax-pre-lttrn 11171 ax-pre-ltadd 11172 ax-pre-mulgt0 11173 ax-pre-sup 11174 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1570 df-fal 1580 df-ex 1807 df-nf 1811 df-sb 2098 df-mo 2573 df-eu 2603 df-clab 2748 df-cleq 2761 df-clel 2844 df-nfc 2918 df-ne 2965 df-nel 3071 df-ral 3086 df-rex 3096 df-rmo 3376 df-reu 3377 df-rab 3424 df-v 3465 df-sbc 3754 df-csb 3862 df-dif 3916 df-un 3918 df-in 3920 df-ss 3930 df-pss 3933 df-nul 4295 df-if 4490 df-pw 4566 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4874 df-int 4914 df-iun 4959 df-br 5111 df-opab 5175 df-mpt 5194 df-tr 5220 df-id 5554 df-eprel 5559 df-po 5567 df-so 5568 df-fr 5612 df-se 5613 df-we 5614 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 df-pred 6300 df-ord 6361 df-on 6362 df-lim 6363 df-suc 6364 df-iota 6490 df-fun 6536 df-fn 6537 df-f 6538 df-f1 6539 df-fo 6540 df-f1o 6541 df-fv 6542 df-isom 6543 df-riota 7365 df-ov 7411 df-oprab 7412 df-mpo 7413 df-of 7672 df-om 7859 df-1st 7982 df-2nd 7983 df-frecs 8274 df-wrecs 8305 df-recs 8354 df-rdg 8393 df-1o 8449 df-2o 8450 df-er 8690 df-map 8822 df-pm 8823 df-en 8940 df-dom 8941 df-sdom 8942 df-fin 8943 df-sup 9398 df-inf 9399 df-oi 9468 df-dju 9883 df-card 9921 df-pnf 11241 df-mnf 11242 df-xr 11243 df-ltxr 11244 df-le 11245 df-sub 11439 df-neg 11440 df-div 11868 df-nn 12230 df-2 12299 df-3 12300 df-n0 12501 df-z 12588 df-uz 12859 df-q 12969 df-rp 13013 df-xadd 13134 df-ioo 13372 df-ico 13374 df-icc 13375 df-fz 13532 df-fzo 13679 df-fl 13821 df-seq 14034 df-exp 14094 df-hash 14363 df-cj 15146 df-re 15147 df-im 15148 df-sqrt 15282 df-abs 15283 df-clim 15535 df-sum 15734 df-xmet 21480 df-met 21481 df-ovol 25588 df-vol 25589 df-mbf 25743 |
| This theorem is referenced by: mbfeqa 25767 mbfss 25770 mbfmulc2re 25772 mbfadd 25785 mbfmulc2 25787 mbflim 25792 mbfmul 25850 iblcn 25923 ibladd 25945 ibladdnc 38211 ftc1anclem2 38228 ftc1anclem5 38231 ftc1anclem6 38232 ftc1anclem8 38234 |
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