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Mirrors > Home > MPE Home > Th. List > mbfconst | Structured version Visualization version GIF version |
Description: A constant function is measurable. (Contributed by Mario Carneiro, 17-Jun-2014.) |
Ref | Expression |
---|---|
mbfconst | ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ ℂ) → (𝐴 × {𝐵}) ∈ MblFn) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simplr 766 | . . . 4 ⊢ (((𝐴 ∈ dom vol ∧ 𝐵 ∈ ℂ) ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℂ) | |
2 | fconstmpt 5649 | . . . 4 ⊢ (𝐴 × {𝐵}) = (𝑥 ∈ 𝐴 ↦ 𝐵) | |
3 | 1, 2 | fmptd 6988 | . . 3 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ ℂ) → (𝐴 × {𝐵}):𝐴⟶ℂ) |
4 | mblss 24695 | . . . 4 ⊢ (𝐴 ∈ dom vol → 𝐴 ⊆ ℝ) | |
5 | 4 | adantr 481 | . . 3 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ ℂ) → 𝐴 ⊆ ℝ) |
6 | cnex 10952 | . . . 4 ⊢ ℂ ∈ V | |
7 | reex 10962 | . . . 4 ⊢ ℝ ∈ V | |
8 | elpm2r 8633 | . . . 4 ⊢ (((ℂ ∈ V ∧ ℝ ∈ V) ∧ ((𝐴 × {𝐵}):𝐴⟶ℂ ∧ 𝐴 ⊆ ℝ)) → (𝐴 × {𝐵}) ∈ (ℂ ↑pm ℝ)) | |
9 | 6, 7, 8 | mpanl12 699 | . . 3 ⊢ (((𝐴 × {𝐵}):𝐴⟶ℂ ∧ 𝐴 ⊆ ℝ) → (𝐴 × {𝐵}) ∈ (ℂ ↑pm ℝ)) |
10 | 3, 5, 9 | syl2anc 584 | . 2 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ ℂ) → (𝐴 × {𝐵}) ∈ (ℂ ↑pm ℝ)) |
11 | 2 | a1i 11 | . . . . . . . . 9 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ ℂ) → (𝐴 × {𝐵}) = (𝑥 ∈ 𝐴 ↦ 𝐵)) |
12 | ref 14823 | . . . . . . . . . . 11 ⊢ ℜ:ℂ⟶ℝ | |
13 | 12 | a1i 11 | . . . . . . . . . 10 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ ℂ) → ℜ:ℂ⟶ℝ) |
14 | 13 | feqmptd 6837 | . . . . . . . . 9 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ ℂ) → ℜ = (𝑦 ∈ ℂ ↦ (ℜ‘𝑦))) |
15 | fveq2 6774 | . . . . . . . . 9 ⊢ (𝑦 = 𝐵 → (ℜ‘𝑦) = (ℜ‘𝐵)) | |
16 | 1, 11, 14, 15 | fmptco 7001 | . . . . . . . 8 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ ℂ) → (ℜ ∘ (𝐴 × {𝐵})) = (𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵))) |
17 | fconstmpt 5649 | . . . . . . . 8 ⊢ (𝐴 × {(ℜ‘𝐵)}) = (𝑥 ∈ 𝐴 ↦ (ℜ‘𝐵)) | |
18 | 16, 17 | eqtr4di 2796 | . . . . . . 7 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ ℂ) → (ℜ ∘ (𝐴 × {𝐵})) = (𝐴 × {(ℜ‘𝐵)})) |
19 | 18 | cnveqd 5784 | . . . . . 6 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ ℂ) → ◡(ℜ ∘ (𝐴 × {𝐵})) = ◡(𝐴 × {(ℜ‘𝐵)})) |
20 | 19 | imaeq1d 5968 | . . . . 5 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ ℂ) → (◡(ℜ ∘ (𝐴 × {𝐵})) “ 𝑦) = (◡(𝐴 × {(ℜ‘𝐵)}) “ 𝑦)) |
21 | recl 14821 | . . . . . 6 ⊢ (𝐵 ∈ ℂ → (ℜ‘𝐵) ∈ ℝ) | |
22 | mbfconstlem 24791 | . . . . . 6 ⊢ ((𝐴 ∈ dom vol ∧ (ℜ‘𝐵) ∈ ℝ) → (◡(𝐴 × {(ℜ‘𝐵)}) “ 𝑦) ∈ dom vol) | |
23 | 21, 22 | sylan2 593 | . . . . 5 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ ℂ) → (◡(𝐴 × {(ℜ‘𝐵)}) “ 𝑦) ∈ dom vol) |
24 | 20, 23 | eqeltrd 2839 | . . . 4 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ ℂ) → (◡(ℜ ∘ (𝐴 × {𝐵})) “ 𝑦) ∈ dom vol) |
25 | imf 14824 | . . . . . . . . . . 11 ⊢ ℑ:ℂ⟶ℝ | |
26 | 25 | a1i 11 | . . . . . . . . . 10 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ ℂ) → ℑ:ℂ⟶ℝ) |
27 | 26 | feqmptd 6837 | . . . . . . . . 9 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ ℂ) → ℑ = (𝑦 ∈ ℂ ↦ (ℑ‘𝑦))) |
28 | fveq2 6774 | . . . . . . . . 9 ⊢ (𝑦 = 𝐵 → (ℑ‘𝑦) = (ℑ‘𝐵)) | |
29 | 1, 11, 27, 28 | fmptco 7001 | . . . . . . . 8 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ ℂ) → (ℑ ∘ (𝐴 × {𝐵})) = (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵))) |
30 | fconstmpt 5649 | . . . . . . . 8 ⊢ (𝐴 × {(ℑ‘𝐵)}) = (𝑥 ∈ 𝐴 ↦ (ℑ‘𝐵)) | |
31 | 29, 30 | eqtr4di 2796 | . . . . . . 7 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ ℂ) → (ℑ ∘ (𝐴 × {𝐵})) = (𝐴 × {(ℑ‘𝐵)})) |
32 | 31 | cnveqd 5784 | . . . . . 6 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ ℂ) → ◡(ℑ ∘ (𝐴 × {𝐵})) = ◡(𝐴 × {(ℑ‘𝐵)})) |
33 | 32 | imaeq1d 5968 | . . . . 5 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ ℂ) → (◡(ℑ ∘ (𝐴 × {𝐵})) “ 𝑦) = (◡(𝐴 × {(ℑ‘𝐵)}) “ 𝑦)) |
34 | imcl 14822 | . . . . . 6 ⊢ (𝐵 ∈ ℂ → (ℑ‘𝐵) ∈ ℝ) | |
35 | mbfconstlem 24791 | . . . . . 6 ⊢ ((𝐴 ∈ dom vol ∧ (ℑ‘𝐵) ∈ ℝ) → (◡(𝐴 × {(ℑ‘𝐵)}) “ 𝑦) ∈ dom vol) | |
36 | 34, 35 | sylan2 593 | . . . . 5 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ ℂ) → (◡(𝐴 × {(ℑ‘𝐵)}) “ 𝑦) ∈ dom vol) |
37 | 33, 36 | eqeltrd 2839 | . . . 4 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ ℂ) → (◡(ℑ ∘ (𝐴 × {𝐵})) “ 𝑦) ∈ dom vol) |
38 | 24, 37 | jca 512 | . . 3 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ ℂ) → ((◡(ℜ ∘ (𝐴 × {𝐵})) “ 𝑦) ∈ dom vol ∧ (◡(ℑ ∘ (𝐴 × {𝐵})) “ 𝑦) ∈ dom vol)) |
39 | 38 | ralrimivw 3104 | . 2 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ ℂ) → ∀𝑦 ∈ ran (,)((◡(ℜ ∘ (𝐴 × {𝐵})) “ 𝑦) ∈ dom vol ∧ (◡(ℑ ∘ (𝐴 × {𝐵})) “ 𝑦) ∈ dom vol)) |
40 | ismbf1 24788 | . 2 ⊢ ((𝐴 × {𝐵}) ∈ MblFn ↔ ((𝐴 × {𝐵}) ∈ (ℂ ↑pm ℝ) ∧ ∀𝑦 ∈ ran (,)((◡(ℜ ∘ (𝐴 × {𝐵})) “ 𝑦) ∈ dom vol ∧ (◡(ℑ ∘ (𝐴 × {𝐵})) “ 𝑦) ∈ dom vol))) | |
41 | 10, 39, 40 | sylanbrc 583 | 1 ⊢ ((𝐴 ∈ dom vol ∧ 𝐵 ∈ ℂ) → (𝐴 × {𝐵}) ∈ MblFn) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 396 = wceq 1539 ∈ wcel 2106 ∀wral 3064 Vcvv 3432 ⊆ wss 3887 {csn 4561 ↦ cmpt 5157 × cxp 5587 ◡ccnv 5588 dom cdm 5589 ran crn 5590 “ cima 5592 ∘ ccom 5593 ⟶wf 6429 ‘cfv 6433 (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: mbf0 24798 mbfss 24810 mbfmulc2lem 24811 mbfpos 24815 ibl0 24951 iblconst 24982 |
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