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Mirrors > Home > MPE Home > Th. List > divcncf | Structured version Visualization version GIF version |
Description: The quotient of two continuous complex functions is continuous. (Contributed by Glauco Siliprandi, 11-Dec-2019.) |
Ref | Expression |
---|---|
divcncf.1 | ⊢ (𝜑 → (𝑥 ∈ 𝑋 ↦ 𝐴) ∈ (𝑋–cn→ℂ)) |
divcncf.2 | ⊢ (𝜑 → (𝑥 ∈ 𝑋 ↦ 𝐵) ∈ (𝑋–cn→(ℂ ∖ {0}))) |
Ref | Expression |
---|---|
divcncf | ⊢ (𝜑 → (𝑥 ∈ 𝑋 ↦ (𝐴 / 𝐵)) ∈ (𝑋–cn→ℂ)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | divcncf.1 | . . . . . 6 ⊢ (𝜑 → (𝑥 ∈ 𝑋 ↦ 𝐴) ∈ (𝑋–cn→ℂ)) | |
2 | cncff 23962 | . . . . . 6 ⊢ ((𝑥 ∈ 𝑋 ↦ 𝐴) ∈ (𝑋–cn→ℂ) → (𝑥 ∈ 𝑋 ↦ 𝐴):𝑋⟶ℂ) | |
3 | 1, 2 | syl 17 | . . . . 5 ⊢ (𝜑 → (𝑥 ∈ 𝑋 ↦ 𝐴):𝑋⟶ℂ) |
4 | 3 | fvmptelrn 6969 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → 𝐴 ∈ ℂ) |
5 | divcncf.2 | . . . . . . 7 ⊢ (𝜑 → (𝑥 ∈ 𝑋 ↦ 𝐵) ∈ (𝑋–cn→(ℂ ∖ {0}))) | |
6 | cncff 23962 | . . . . . . 7 ⊢ ((𝑥 ∈ 𝑋 ↦ 𝐵) ∈ (𝑋–cn→(ℂ ∖ {0})) → (𝑥 ∈ 𝑋 ↦ 𝐵):𝑋⟶(ℂ ∖ {0})) | |
7 | 5, 6 | syl 17 | . . . . . 6 ⊢ (𝜑 → (𝑥 ∈ 𝑋 ↦ 𝐵):𝑋⟶(ℂ ∖ {0})) |
8 | 7 | fvmptelrn 6969 | . . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → 𝐵 ∈ (ℂ ∖ {0})) |
9 | 8 | eldifad 3895 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → 𝐵 ∈ ℂ) |
10 | eldifsni 4720 | . . . . 5 ⊢ (𝐵 ∈ (ℂ ∖ {0}) → 𝐵 ≠ 0) | |
11 | 8, 10 | syl 17 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → 𝐵 ≠ 0) |
12 | 4, 9, 11 | divrecd 11684 | . . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → (𝐴 / 𝐵) = (𝐴 · (1 / 𝐵))) |
13 | 12 | mpteq2dva 5170 | . 2 ⊢ (𝜑 → (𝑥 ∈ 𝑋 ↦ (𝐴 / 𝐵)) = (𝑥 ∈ 𝑋 ↦ (𝐴 · (1 / 𝐵)))) |
14 | 8 | ralrimiva 3107 | . . . . . 6 ⊢ (𝜑 → ∀𝑥 ∈ 𝑋 𝐵 ∈ (ℂ ∖ {0})) |
15 | eqidd 2739 | . . . . . 6 ⊢ (𝜑 → (𝑥 ∈ 𝑋 ↦ 𝐵) = (𝑥 ∈ 𝑋 ↦ 𝐵)) | |
16 | eqidd 2739 | . . . . . 6 ⊢ (𝜑 → (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)) = (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))) | |
17 | 14, 15, 16 | fmptcos 6985 | . . . . 5 ⊢ (𝜑 → ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)) ∘ (𝑥 ∈ 𝑋 ↦ 𝐵)) = (𝑥 ∈ 𝑋 ↦ ⦋𝐵 / 𝑦⦌(1 / 𝑦))) |
18 | csbov2g 7301 | . . . . . . . 8 ⊢ (𝐵 ∈ ℂ → ⦋𝐵 / 𝑦⦌(1 / 𝑦) = (1 / ⦋𝐵 / 𝑦⦌𝑦)) | |
19 | 9, 18 | syl 17 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → ⦋𝐵 / 𝑦⦌(1 / 𝑦) = (1 / ⦋𝐵 / 𝑦⦌𝑦)) |
20 | csbvarg 4362 | . . . . . . . . 9 ⊢ (𝐵 ∈ ℂ → ⦋𝐵 / 𝑦⦌𝑦 = 𝐵) | |
21 | 9, 20 | syl 17 | . . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → ⦋𝐵 / 𝑦⦌𝑦 = 𝐵) |
22 | 21 | oveq2d 7271 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → (1 / ⦋𝐵 / 𝑦⦌𝑦) = (1 / 𝐵)) |
23 | 19, 22 | eqtrd 2778 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → ⦋𝐵 / 𝑦⦌(1 / 𝑦) = (1 / 𝐵)) |
24 | 23 | mpteq2dva 5170 | . . . . 5 ⊢ (𝜑 → (𝑥 ∈ 𝑋 ↦ ⦋𝐵 / 𝑦⦌(1 / 𝑦)) = (𝑥 ∈ 𝑋 ↦ (1 / 𝐵))) |
25 | 17, 24 | eqtr2d 2779 | . . . 4 ⊢ (𝜑 → (𝑥 ∈ 𝑋 ↦ (1 / 𝐵)) = ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)) ∘ (𝑥 ∈ 𝑋 ↦ 𝐵))) |
26 | ax-1cn 10860 | . . . . . 6 ⊢ 1 ∈ ℂ | |
27 | eqid 2738 | . . . . . . 7 ⊢ (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)) = (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)) | |
28 | 27 | cdivcncf 23990 | . . . . . 6 ⊢ (1 ∈ ℂ → (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)) ∈ ((ℂ ∖ {0})–cn→ℂ)) |
29 | 26, 28 | mp1i 13 | . . . . 5 ⊢ (𝜑 → (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)) ∈ ((ℂ ∖ {0})–cn→ℂ)) |
30 | 5, 29 | cncfco 23976 | . . . 4 ⊢ (𝜑 → ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)) ∘ (𝑥 ∈ 𝑋 ↦ 𝐵)) ∈ (𝑋–cn→ℂ)) |
31 | 25, 30 | eqeltrd 2839 | . . 3 ⊢ (𝜑 → (𝑥 ∈ 𝑋 ↦ (1 / 𝐵)) ∈ (𝑋–cn→ℂ)) |
32 | 1, 31 | mulcncf 24515 | . 2 ⊢ (𝜑 → (𝑥 ∈ 𝑋 ↦ (𝐴 · (1 / 𝐵))) ∈ (𝑋–cn→ℂ)) |
33 | 13, 32 | eqeltrd 2839 | 1 ⊢ (𝜑 → (𝑥 ∈ 𝑋 ↦ (𝐴 / 𝐵)) ∈ (𝑋–cn→ℂ)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 395 = wceq 1539 ∈ wcel 2108 ≠ wne 2942 ⦋csb 3828 ∖ cdif 3880 {csn 4558 ↦ cmpt 5153 ∘ ccom 5584 ⟶wf 6414 (class class class)co 7255 ℂcc 10800 0cc0 10802 1c1 10803 · cmul 10807 / cdiv 11562 –cn→ccncf 23945 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-rep 5205 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 ax-cnex 10858 ax-resscn 10859 ax-1cn 10860 ax-icn 10861 ax-addcl 10862 ax-addrcl 10863 ax-mulcl 10864 ax-mulrcl 10865 ax-mulcom 10866 ax-addass 10867 ax-mulass 10868 ax-distr 10869 ax-i2m1 10870 ax-1ne0 10871 ax-1rid 10872 ax-rnegex 10873 ax-rrecex 10874 ax-cnre 10875 ax-pre-lttri 10876 ax-pre-lttrn 10877 ax-pre-ltadd 10878 ax-pre-mulgt0 10879 ax-pre-sup 10880 ax-mulf 10882 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-nel 3049 df-ral 3068 df-rex 3069 df-reu 3070 df-rmo 3071 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-pss 3902 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-tp 4563 df-op 4565 df-uni 4837 df-int 4877 df-iun 4923 df-iin 4924 df-br 5071 df-opab 5133 df-mpt 5154 df-tr 5188 df-id 5480 df-eprel 5486 df-po 5494 df-so 5495 df-fr 5535 df-se 5536 df-we 5537 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-pred 6191 df-ord 6254 df-on 6255 df-lim 6256 df-suc 6257 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-isom 6427 df-riota 7212 df-ov 7258 df-oprab 7259 df-mpo 7260 df-of 7511 df-om 7688 df-1st 7804 df-2nd 7805 df-supp 7949 df-frecs 8068 df-wrecs 8099 df-recs 8173 df-rdg 8212 df-1o 8267 df-2o 8268 df-er 8456 df-map 8575 df-ixp 8644 df-en 8692 df-dom 8693 df-sdom 8694 df-fin 8695 df-fsupp 9059 df-fi 9100 df-sup 9131 df-inf 9132 df-oi 9199 df-card 9628 df-pnf 10942 df-mnf 10943 df-xr 10944 df-ltxr 10945 df-le 10946 df-sub 11137 df-neg 11138 df-div 11563 df-nn 11904 df-2 11966 df-3 11967 df-4 11968 df-5 11969 df-6 11970 df-7 11971 df-8 11972 df-9 11973 df-n0 12164 df-z 12250 df-dec 12367 df-uz 12512 df-q 12618 df-rp 12660 df-xneg 12777 df-xadd 12778 df-xmul 12779 df-icc 13015 df-fz 13169 df-fzo 13312 df-seq 13650 df-exp 13711 df-hash 13973 df-cj 14738 df-re 14739 df-im 14740 df-sqrt 14874 df-abs 14875 df-struct 16776 df-sets 16793 df-slot 16811 df-ndx 16823 df-base 16841 df-ress 16868 df-plusg 16901 df-mulr 16902 df-starv 16903 df-sca 16904 df-vsca 16905 df-ip 16906 df-tset 16907 df-ple 16908 df-ds 16910 df-unif 16911 df-hom 16912 df-cco 16913 df-rest 17050 df-topn 17051 df-0g 17069 df-gsum 17070 df-topgen 17071 df-pt 17072 df-prds 17075 df-xrs 17130 df-qtop 17135 df-imas 17136 df-xps 17138 df-mre 17212 df-mrc 17213 df-acs 17215 df-mgm 18241 df-sgrp 18290 df-mnd 18301 df-submnd 18346 df-mulg 18616 df-cntz 18838 df-cmn 19303 df-psmet 20502 df-xmet 20503 df-met 20504 df-bl 20505 df-mopn 20506 df-cnfld 20511 df-top 21951 df-topon 21968 df-topsp 21990 df-bases 22004 df-cn 22286 df-cnp 22287 df-tx 22621 df-hmeo 22814 df-xms 23381 df-ms 23382 df-tms 23383 df-cncf 23947 |
This theorem is referenced by: logdivsqrle 32530 divcncff 43322 itgcoscmulx 43400 itgsincmulx 43405 dirkeritg 43533 dirkercncflem2 43535 fourierdlem39 43577 fourierdlem58 43595 fourierdlem62 43599 fourierdlem68 43605 fourierdlem76 43613 |
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