Mathbox for Glauco Siliprandi |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > dvdivcncf | Structured version Visualization version GIF version |
Description: A sufficient condition for the derivative of a quotient to be continuous. (Contributed by Glauco Siliprandi, 11-Dec-2019.) |
Ref | Expression |
---|---|
dvdivcncf.s | ⊢ (𝜑 → 𝑆 ∈ {ℝ, ℂ}) |
dvdivcncf.f | ⊢ (𝜑 → 𝐹:𝑋⟶ℂ) |
dvdivcncf.g | ⊢ (𝜑 → 𝐺:𝑋⟶(ℂ ∖ {0})) |
dvdivcncf.fdv | ⊢ (𝜑 → (𝑆 D 𝐹) ∈ (𝑋–cn→ℂ)) |
dvdivcncf.gdv | ⊢ (𝜑 → (𝑆 D 𝐺) ∈ (𝑋–cn→ℂ)) |
Ref | Expression |
---|---|
dvdivcncf | ⊢ (𝜑 → (𝑆 D (𝐹 ∘f / 𝐺)) ∈ (𝑋–cn→ℂ)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dvdivcncf.s | . . 3 ⊢ (𝜑 → 𝑆 ∈ {ℝ, ℂ}) | |
2 | dvdivcncf.f | . . 3 ⊢ (𝜑 → 𝐹:𝑋⟶ℂ) | |
3 | dvdivcncf.g | . . 3 ⊢ (𝜑 → 𝐺:𝑋⟶(ℂ ∖ {0})) | |
4 | dvdivcncf.fdv | . . . 4 ⊢ (𝜑 → (𝑆 D 𝐹) ∈ (𝑋–cn→ℂ)) | |
5 | cncff 23587 | . . . 4 ⊢ ((𝑆 D 𝐹) ∈ (𝑋–cn→ℂ) → (𝑆 D 𝐹):𝑋⟶ℂ) | |
6 | fdm 6507 | . . . 4 ⊢ ((𝑆 D 𝐹):𝑋⟶ℂ → dom (𝑆 D 𝐹) = 𝑋) | |
7 | 4, 5, 6 | 3syl 18 | . . 3 ⊢ (𝜑 → dom (𝑆 D 𝐹) = 𝑋) |
8 | dvdivcncf.gdv | . . . 4 ⊢ (𝜑 → (𝑆 D 𝐺) ∈ (𝑋–cn→ℂ)) | |
9 | cncff 23587 | . . . 4 ⊢ ((𝑆 D 𝐺) ∈ (𝑋–cn→ℂ) → (𝑆 D 𝐺):𝑋⟶ℂ) | |
10 | fdm 6507 | . . . 4 ⊢ ((𝑆 D 𝐺):𝑋⟶ℂ → dom (𝑆 D 𝐺) = 𝑋) | |
11 | 8, 9, 10 | 3syl 18 | . . 3 ⊢ (𝜑 → dom (𝑆 D 𝐺) = 𝑋) |
12 | 1, 2, 3, 7, 11 | dvdivf 42923 | . 2 ⊢ (𝜑 → (𝑆 D (𝐹 ∘f / 𝐺)) = ((((𝑆 D 𝐹) ∘f · 𝐺) ∘f − ((𝑆 D 𝐺) ∘f · 𝐹)) ∘f / (𝐺 ∘f · 𝐺))) |
13 | ax-resscn 10625 | . . . . . . . . 9 ⊢ ℝ ⊆ ℂ | |
14 | sseq1 3918 | . . . . . . . . 9 ⊢ (𝑆 = ℝ → (𝑆 ⊆ ℂ ↔ ℝ ⊆ ℂ)) | |
15 | 13, 14 | mpbiri 261 | . . . . . . . 8 ⊢ (𝑆 = ℝ → 𝑆 ⊆ ℂ) |
16 | eqimss 3949 | . . . . . . . 8 ⊢ (𝑆 = ℂ → 𝑆 ⊆ ℂ) | |
17 | 15, 16 | pm3.2i 475 | . . . . . . 7 ⊢ ((𝑆 = ℝ → 𝑆 ⊆ ℂ) ∧ (𝑆 = ℂ → 𝑆 ⊆ ℂ)) |
18 | elpri 4545 | . . . . . . . 8 ⊢ (𝑆 ∈ {ℝ, ℂ} → (𝑆 = ℝ ∨ 𝑆 = ℂ)) | |
19 | 1, 18 | syl 17 | . . . . . . 7 ⊢ (𝜑 → (𝑆 = ℝ ∨ 𝑆 = ℂ)) |
20 | pm3.44 958 | . . . . . . 7 ⊢ (((𝑆 = ℝ → 𝑆 ⊆ ℂ) ∧ (𝑆 = ℂ → 𝑆 ⊆ ℂ)) → ((𝑆 = ℝ ∨ 𝑆 = ℂ) → 𝑆 ⊆ ℂ)) | |
21 | 17, 19, 20 | mpsyl 68 | . . . . . 6 ⊢ (𝜑 → 𝑆 ⊆ ℂ) |
22 | difssd 4039 | . . . . . . 7 ⊢ (𝜑 → (ℂ ∖ {0}) ⊆ ℂ) | |
23 | 3, 22 | fssd 6514 | . . . . . 6 ⊢ (𝜑 → 𝐺:𝑋⟶ℂ) |
24 | dvbsss 24594 | . . . . . . 7 ⊢ dom (𝑆 D 𝐹) ⊆ 𝑆 | |
25 | 7, 24 | eqsstrrdi 3948 | . . . . . 6 ⊢ (𝜑 → 𝑋 ⊆ 𝑆) |
26 | dvcn 24613 | . . . . . 6 ⊢ (((𝑆 ⊆ ℂ ∧ 𝐺:𝑋⟶ℂ ∧ 𝑋 ⊆ 𝑆) ∧ dom (𝑆 D 𝐺) = 𝑋) → 𝐺 ∈ (𝑋–cn→ℂ)) | |
27 | 21, 23, 25, 11, 26 | syl31anc 1371 | . . . . 5 ⊢ (𝜑 → 𝐺 ∈ (𝑋–cn→ℂ)) |
28 | 4, 27 | mulcncff 42871 | . . . 4 ⊢ (𝜑 → ((𝑆 D 𝐹) ∘f · 𝐺) ∈ (𝑋–cn→ℂ)) |
29 | dvcn 24613 | . . . . . 6 ⊢ (((𝑆 ⊆ ℂ ∧ 𝐹:𝑋⟶ℂ ∧ 𝑋 ⊆ 𝑆) ∧ dom (𝑆 D 𝐹) = 𝑋) → 𝐹 ∈ (𝑋–cn→ℂ)) | |
30 | 21, 2, 25, 7, 29 | syl31anc 1371 | . . . . 5 ⊢ (𝜑 → 𝐹 ∈ (𝑋–cn→ℂ)) |
31 | 8, 30 | mulcncff 42871 | . . . 4 ⊢ (𝜑 → ((𝑆 D 𝐺) ∘f · 𝐹) ∈ (𝑋–cn→ℂ)) |
32 | 28, 31 | subcncff 42881 | . . 3 ⊢ (𝜑 → (((𝑆 D 𝐹) ∘f · 𝐺) ∘f − ((𝑆 D 𝐺) ∘f · 𝐹)) ∈ (𝑋–cn→ℂ)) |
33 | eldifi 4033 | . . . . . . . . 9 ⊢ (𝑥 ∈ (ℂ ∖ {0}) → 𝑥 ∈ ℂ) | |
34 | 33 | adantr 485 | . . . . . . . 8 ⊢ ((𝑥 ∈ (ℂ ∖ {0}) ∧ 𝑦 ∈ (ℂ ∖ {0})) → 𝑥 ∈ ℂ) |
35 | eldifi 4033 | . . . . . . . . 9 ⊢ (𝑦 ∈ (ℂ ∖ {0}) → 𝑦 ∈ ℂ) | |
36 | 35 | adantl 486 | . . . . . . . 8 ⊢ ((𝑥 ∈ (ℂ ∖ {0}) ∧ 𝑦 ∈ (ℂ ∖ {0})) → 𝑦 ∈ ℂ) |
37 | 34, 36 | mulcld 10692 | . . . . . . 7 ⊢ ((𝑥 ∈ (ℂ ∖ {0}) ∧ 𝑦 ∈ (ℂ ∖ {0})) → (𝑥 · 𝑦) ∈ ℂ) |
38 | eldifsni 4681 | . . . . . . . . 9 ⊢ (𝑥 ∈ (ℂ ∖ {0}) → 𝑥 ≠ 0) | |
39 | 38 | adantr 485 | . . . . . . . 8 ⊢ ((𝑥 ∈ (ℂ ∖ {0}) ∧ 𝑦 ∈ (ℂ ∖ {0})) → 𝑥 ≠ 0) |
40 | eldifsni 4681 | . . . . . . . . 9 ⊢ (𝑦 ∈ (ℂ ∖ {0}) → 𝑦 ≠ 0) | |
41 | 40 | adantl 486 | . . . . . . . 8 ⊢ ((𝑥 ∈ (ℂ ∖ {0}) ∧ 𝑦 ∈ (ℂ ∖ {0})) → 𝑦 ≠ 0) |
42 | 34, 36, 39, 41 | mulne0d 11323 | . . . . . . 7 ⊢ ((𝑥 ∈ (ℂ ∖ {0}) ∧ 𝑦 ∈ (ℂ ∖ {0})) → (𝑥 · 𝑦) ≠ 0) |
43 | eldifsn 4678 | . . . . . . 7 ⊢ ((𝑥 · 𝑦) ∈ (ℂ ∖ {0}) ↔ ((𝑥 · 𝑦) ∈ ℂ ∧ (𝑥 · 𝑦) ≠ 0)) | |
44 | 37, 42, 43 | sylanbrc 587 | . . . . . 6 ⊢ ((𝑥 ∈ (ℂ ∖ {0}) ∧ 𝑦 ∈ (ℂ ∖ {0})) → (𝑥 · 𝑦) ∈ (ℂ ∖ {0})) |
45 | 44 | adantl 486 | . . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ (ℂ ∖ {0}) ∧ 𝑦 ∈ (ℂ ∖ {0}))) → (𝑥 · 𝑦) ∈ (ℂ ∖ {0})) |
46 | 1, 25 | ssexd 5195 | . . . . 5 ⊢ (𝜑 → 𝑋 ∈ V) |
47 | inidm 4124 | . . . . 5 ⊢ (𝑋 ∩ 𝑋) = 𝑋 | |
48 | 45, 3, 3, 46, 46, 47 | off 7423 | . . . 4 ⊢ (𝜑 → (𝐺 ∘f · 𝐺):𝑋⟶(ℂ ∖ {0})) |
49 | 27, 27 | mulcncff 42871 | . . . . 5 ⊢ (𝜑 → (𝐺 ∘f · 𝐺) ∈ (𝑋–cn→ℂ)) |
50 | cncffvrn 23592 | . . . . 5 ⊢ (((ℂ ∖ {0}) ⊆ ℂ ∧ (𝐺 ∘f · 𝐺) ∈ (𝑋–cn→ℂ)) → ((𝐺 ∘f · 𝐺) ∈ (𝑋–cn→(ℂ ∖ {0})) ↔ (𝐺 ∘f · 𝐺):𝑋⟶(ℂ ∖ {0}))) | |
51 | 22, 49, 50 | syl2anc 588 | . . . 4 ⊢ (𝜑 → ((𝐺 ∘f · 𝐺) ∈ (𝑋–cn→(ℂ ∖ {0})) ↔ (𝐺 ∘f · 𝐺):𝑋⟶(ℂ ∖ {0}))) |
52 | 48, 51 | mpbird 260 | . . 3 ⊢ (𝜑 → (𝐺 ∘f · 𝐺) ∈ (𝑋–cn→(ℂ ∖ {0}))) |
53 | 32, 52 | divcncff 42892 | . 2 ⊢ (𝜑 → ((((𝑆 D 𝐹) ∘f · 𝐺) ∘f − ((𝑆 D 𝐺) ∘f · 𝐹)) ∘f / (𝐺 ∘f · 𝐺)) ∈ (𝑋–cn→ℂ)) |
54 | 12, 53 | eqeltrd 2853 | 1 ⊢ (𝜑 → (𝑆 D (𝐹 ∘f / 𝐺)) ∈ (𝑋–cn→ℂ)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 209 ∧ wa 400 ∨ wo 845 = wceq 1539 ∈ wcel 2112 ≠ wne 2952 Vcvv 3410 ∖ cdif 3856 ⊆ wss 3859 {csn 4523 {cpr 4525 dom cdm 5525 ⟶wf 6332 (class class class)co 7151 ∘f cof 7404 ℂcc 10566 ℝcr 10567 0cc0 10568 · cmul 10573 − cmin 10901 / cdiv 11328 –cn→ccncf 23570 D cdv 24555 |
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 1912 ax-6 1971 ax-7 2016 ax-8 2114 ax-9 2122 ax-10 2143 ax-11 2159 ax-12 2176 ax-ext 2730 ax-rep 5157 ax-sep 5170 ax-nul 5177 ax-pow 5235 ax-pr 5299 ax-un 7460 ax-cnex 10624 ax-resscn 10625 ax-1cn 10626 ax-icn 10627 ax-addcl 10628 ax-addrcl 10629 ax-mulcl 10630 ax-mulrcl 10631 ax-mulcom 10632 ax-addass 10633 ax-mulass 10634 ax-distr 10635 ax-i2m1 10636 ax-1ne0 10637 ax-1rid 10638 ax-rnegex 10639 ax-rrecex 10640 ax-cnre 10641 ax-pre-lttri 10642 ax-pre-lttrn 10643 ax-pre-ltadd 10644 ax-pre-mulgt0 10645 ax-pre-sup 10646 ax-addf 10647 ax-mulf 10648 |
This theorem depends on definitions: df-bi 210 df-an 401 df-or 846 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2071 df-mo 2558 df-eu 2589 df-clab 2737 df-cleq 2751 df-clel 2831 df-nfc 2902 df-ne 2953 df-nel 3057 df-ral 3076 df-rex 3077 df-reu 3078 df-rmo 3079 df-rab 3080 df-v 3412 df-sbc 3698 df-csb 3807 df-dif 3862 df-un 3864 df-in 3866 df-ss 3876 df-pss 3878 df-nul 4227 df-if 4422 df-pw 4497 df-sn 4524 df-pr 4526 df-tp 4528 df-op 4530 df-uni 4800 df-int 4840 df-iun 4886 df-iin 4887 df-br 5034 df-opab 5096 df-mpt 5114 df-tr 5140 df-id 5431 df-eprel 5436 df-po 5444 df-so 5445 df-fr 5484 df-se 5485 df-we 5486 df-xp 5531 df-rel 5532 df-cnv 5533 df-co 5534 df-dm 5535 df-rn 5536 df-res 5537 df-ima 5538 df-pred 6127 df-ord 6173 df-on 6174 df-lim 6175 df-suc 6176 df-iota 6295 df-fun 6338 df-fn 6339 df-f 6340 df-f1 6341 df-fo 6342 df-f1o 6343 df-fv 6344 df-isom 6345 df-riota 7109 df-ov 7154 df-oprab 7155 df-mpo 7156 df-of 7406 df-om 7581 df-1st 7694 df-2nd 7695 df-supp 7837 df-wrecs 7958 df-recs 8019 df-rdg 8057 df-1o 8113 df-2o 8114 df-oadd 8117 df-er 8300 df-map 8419 df-pm 8420 df-ixp 8481 df-en 8529 df-dom 8530 df-sdom 8531 df-fin 8532 df-fsupp 8860 df-fi 8901 df-sup 8932 df-inf 8933 df-oi 9000 df-card 9394 df-pnf 10708 df-mnf 10709 df-xr 10710 df-ltxr 10711 df-le 10712 df-sub 10903 df-neg 10904 df-div 11329 df-nn 11668 df-2 11730 df-3 11731 df-4 11732 df-5 11733 df-6 11734 df-7 11735 df-8 11736 df-9 11737 df-n0 11928 df-z 12014 df-dec 12131 df-uz 12276 df-q 12382 df-rp 12424 df-xneg 12541 df-xadd 12542 df-xmul 12543 df-icc 12779 df-fz 12933 df-fzo 13076 df-seq 13412 df-exp 13473 df-hash 13734 df-cj 14499 df-re 14500 df-im 14501 df-sqrt 14635 df-abs 14636 df-struct 16536 df-ndx 16537 df-slot 16538 df-base 16540 df-sets 16541 df-ress 16542 df-plusg 16629 df-mulr 16630 df-starv 16631 df-sca 16632 df-vsca 16633 df-ip 16634 df-tset 16635 df-ple 16636 df-ds 16638 df-unif 16639 df-hom 16640 df-cco 16641 df-rest 16747 df-topn 16748 df-0g 16766 df-gsum 16767 df-topgen 16768 df-pt 16769 df-prds 16772 df-xrs 16826 df-qtop 16831 df-imas 16832 df-xps 16834 df-mre 16908 df-mrc 16909 df-acs 16911 df-mgm 17911 df-sgrp 17960 df-mnd 17971 df-submnd 18016 df-mulg 18285 df-cntz 18507 df-cmn 18968 df-psmet 20151 df-xmet 20152 df-met 20153 df-bl 20154 df-mopn 20155 df-fbas 20156 df-fg 20157 df-cnfld 20160 df-top 21587 df-topon 21604 df-topsp 21626 df-bases 21639 df-cld 21712 df-ntr 21713 df-cls 21714 df-nei 21791 df-lp 21829 df-perf 21830 df-cn 21920 df-cnp 21921 df-t1 22007 df-haus 22008 df-tx 22255 df-hmeo 22448 df-fil 22539 df-fm 22631 df-flim 22632 df-flf 22633 df-xms 23015 df-ms 23016 df-tms 23017 df-cncf 23572 df-limc 24558 df-dv 24559 |
This theorem is referenced by: fourierdlem58 43165 fourierdlem59 43166 |
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