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 23495 | . . . 4 ⊢ ((𝑆 D 𝐹) ∈ (𝑋–cn→ℂ) → (𝑆 D 𝐹):𝑋⟶ℂ) | |
6 | fdm 6516 | . . . 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 23495 | . . . 4 ⊢ ((𝑆 D 𝐺) ∈ (𝑋–cn→ℂ) → (𝑆 D 𝐺):𝑋⟶ℂ) | |
10 | fdm 6516 | . . . 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 42200 | . 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 10588 | . . . . . . . . 9 ⊢ ℝ ⊆ ℂ | |
14 | sseq1 3991 | . . . . . . . . 9 ⊢ (𝑆 = ℝ → (𝑆 ⊆ ℂ ↔ ℝ ⊆ ℂ)) | |
15 | 13, 14 | mpbiri 260 | . . . . . . . 8 ⊢ (𝑆 = ℝ → 𝑆 ⊆ ℂ) |
16 | eqimss 4022 | . . . . . . . 8 ⊢ (𝑆 = ℂ → 𝑆 ⊆ ℂ) | |
17 | 15, 16 | pm3.2i 473 | . . . . . . 7 ⊢ ((𝑆 = ℝ → 𝑆 ⊆ ℂ) ∧ (𝑆 = ℂ → 𝑆 ⊆ ℂ)) |
18 | elpri 4582 | . . . . . . . 8 ⊢ (𝑆 ∈ {ℝ, ℂ} → (𝑆 = ℝ ∨ 𝑆 = ℂ)) | |
19 | 1, 18 | syl 17 | . . . . . . 7 ⊢ (𝜑 → (𝑆 = ℝ ∨ 𝑆 = ℂ)) |
20 | pm3.44 956 | . . . . . . 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 4108 | . . . . . . 7 ⊢ (𝜑 → (ℂ ∖ {0}) ⊆ ℂ) | |
23 | 3, 22 | fssd 6522 | . . . . . 6 ⊢ (𝜑 → 𝐺:𝑋⟶ℂ) |
24 | dvbsss 24494 | . . . . . . 7 ⊢ dom (𝑆 D 𝐹) ⊆ 𝑆 | |
25 | 7, 24 | eqsstrrdi 4021 | . . . . . 6 ⊢ (𝜑 → 𝑋 ⊆ 𝑆) |
26 | dvcn 24512 | . . . . . 6 ⊢ (((𝑆 ⊆ ℂ ∧ 𝐺:𝑋⟶ℂ ∧ 𝑋 ⊆ 𝑆) ∧ dom (𝑆 D 𝐺) = 𝑋) → 𝐺 ∈ (𝑋–cn→ℂ)) | |
27 | 21, 23, 25, 11, 26 | syl31anc 1369 | . . . . 5 ⊢ (𝜑 → 𝐺 ∈ (𝑋–cn→ℂ)) |
28 | 4, 27 | mulcncff 42144 | . . . 4 ⊢ (𝜑 → ((𝑆 D 𝐹) ∘f · 𝐺) ∈ (𝑋–cn→ℂ)) |
29 | dvcn 24512 | . . . . . 6 ⊢ (((𝑆 ⊆ ℂ ∧ 𝐹:𝑋⟶ℂ ∧ 𝑋 ⊆ 𝑆) ∧ dom (𝑆 D 𝐹) = 𝑋) → 𝐹 ∈ (𝑋–cn→ℂ)) | |
30 | 21, 2, 25, 7, 29 | syl31anc 1369 | . . . . 5 ⊢ (𝜑 → 𝐹 ∈ (𝑋–cn→ℂ)) |
31 | 8, 30 | mulcncff 42144 | . . . 4 ⊢ (𝜑 → ((𝑆 D 𝐺) ∘f · 𝐹) ∈ (𝑋–cn→ℂ)) |
32 | 28, 31 | subcncff 42156 | . . 3 ⊢ (𝜑 → (((𝑆 D 𝐹) ∘f · 𝐺) ∘f − ((𝑆 D 𝐺) ∘f · 𝐹)) ∈ (𝑋–cn→ℂ)) |
33 | eldifi 4102 | . . . . . . . . 9 ⊢ (𝑥 ∈ (ℂ ∖ {0}) → 𝑥 ∈ ℂ) | |
34 | 33 | adantr 483 | . . . . . . . 8 ⊢ ((𝑥 ∈ (ℂ ∖ {0}) ∧ 𝑦 ∈ (ℂ ∖ {0})) → 𝑥 ∈ ℂ) |
35 | eldifi 4102 | . . . . . . . . 9 ⊢ (𝑦 ∈ (ℂ ∖ {0}) → 𝑦 ∈ ℂ) | |
36 | 35 | adantl 484 | . . . . . . . 8 ⊢ ((𝑥 ∈ (ℂ ∖ {0}) ∧ 𝑦 ∈ (ℂ ∖ {0})) → 𝑦 ∈ ℂ) |
37 | 34, 36 | mulcld 10655 | . . . . . . 7 ⊢ ((𝑥 ∈ (ℂ ∖ {0}) ∧ 𝑦 ∈ (ℂ ∖ {0})) → (𝑥 · 𝑦) ∈ ℂ) |
38 | eldifsni 4715 | . . . . . . . . 9 ⊢ (𝑥 ∈ (ℂ ∖ {0}) → 𝑥 ≠ 0) | |
39 | 38 | adantr 483 | . . . . . . . 8 ⊢ ((𝑥 ∈ (ℂ ∖ {0}) ∧ 𝑦 ∈ (ℂ ∖ {0})) → 𝑥 ≠ 0) |
40 | eldifsni 4715 | . . . . . . . . 9 ⊢ (𝑦 ∈ (ℂ ∖ {0}) → 𝑦 ≠ 0) | |
41 | 40 | adantl 484 | . . . . . . . 8 ⊢ ((𝑥 ∈ (ℂ ∖ {0}) ∧ 𝑦 ∈ (ℂ ∖ {0})) → 𝑦 ≠ 0) |
42 | 34, 36, 39, 41 | mulne0d 11286 | . . . . . . 7 ⊢ ((𝑥 ∈ (ℂ ∖ {0}) ∧ 𝑦 ∈ (ℂ ∖ {0})) → (𝑥 · 𝑦) ≠ 0) |
43 | eldifsn 4712 | . . . . . . 7 ⊢ ((𝑥 · 𝑦) ∈ (ℂ ∖ {0}) ↔ ((𝑥 · 𝑦) ∈ ℂ ∧ (𝑥 · 𝑦) ≠ 0)) | |
44 | 37, 42, 43 | sylanbrc 585 | . . . . . 6 ⊢ ((𝑥 ∈ (ℂ ∖ {0}) ∧ 𝑦 ∈ (ℂ ∖ {0})) → (𝑥 · 𝑦) ∈ (ℂ ∖ {0})) |
45 | 44 | adantl 484 | . . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ (ℂ ∖ {0}) ∧ 𝑦 ∈ (ℂ ∖ {0}))) → (𝑥 · 𝑦) ∈ (ℂ ∖ {0})) |
46 | 1, 25 | ssexd 5220 | . . . . 5 ⊢ (𝜑 → 𝑋 ∈ V) |
47 | inidm 4194 | . . . . 5 ⊢ (𝑋 ∩ 𝑋) = 𝑋 | |
48 | 45, 3, 3, 46, 46, 47 | off 7418 | . . . 4 ⊢ (𝜑 → (𝐺 ∘f · 𝐺):𝑋⟶(ℂ ∖ {0})) |
49 | 27, 27 | mulcncff 42144 | . . . . 5 ⊢ (𝜑 → (𝐺 ∘f · 𝐺) ∈ (𝑋–cn→ℂ)) |
50 | cncffvrn 23500 | . . . . 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 586 | . . . 4 ⊢ (𝜑 → ((𝐺 ∘f · 𝐺) ∈ (𝑋–cn→(ℂ ∖ {0})) ↔ (𝐺 ∘f · 𝐺):𝑋⟶(ℂ ∖ {0}))) |
52 | 48, 51 | mpbird 259 | . . 3 ⊢ (𝜑 → (𝐺 ∘f · 𝐺) ∈ (𝑋–cn→(ℂ ∖ {0}))) |
53 | 32, 52 | divcncff 42167 | . 2 ⊢ (𝜑 → ((((𝑆 D 𝐹) ∘f · 𝐺) ∘f − ((𝑆 D 𝐺) ∘f · 𝐹)) ∘f / (𝐺 ∘f · 𝐺)) ∈ (𝑋–cn→ℂ)) |
54 | 12, 53 | eqeltrd 2913 | 1 ⊢ (𝜑 → (𝑆 D (𝐹 ∘f / 𝐺)) ∈ (𝑋–cn→ℂ)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 ∧ wa 398 ∨ wo 843 = wceq 1533 ∈ wcel 2110 ≠ wne 3016 Vcvv 3494 ∖ cdif 3932 ⊆ wss 3935 {csn 4560 {cpr 4562 dom cdm 5549 ⟶wf 6345 (class class class)co 7150 ∘f cof 7401 ℂcc 10529 ℝcr 10530 0cc0 10531 · cmul 10536 − cmin 10864 / cdiv 11291 –cn→ccncf 23478 D cdv 24455 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-rep 5182 ax-sep 5195 ax-nul 5202 ax-pow 5258 ax-pr 5321 ax-un 7455 ax-cnex 10587 ax-resscn 10588 ax-1cn 10589 ax-icn 10590 ax-addcl 10591 ax-addrcl 10592 ax-mulcl 10593 ax-mulrcl 10594 ax-mulcom 10595 ax-addass 10596 ax-mulass 10597 ax-distr 10598 ax-i2m1 10599 ax-1ne0 10600 ax-1rid 10601 ax-rnegex 10602 ax-rrecex 10603 ax-cnre 10604 ax-pre-lttri 10605 ax-pre-lttrn 10606 ax-pre-ltadd 10607 ax-pre-mulgt0 10608 ax-pre-sup 10609 ax-addf 10610 ax-mulf 10611 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1536 df-fal 1546 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-reu 3145 df-rmo 3146 df-rab 3147 df-v 3496 df-sbc 3772 df-csb 3883 df-dif 3938 df-un 3940 df-in 3942 df-ss 3951 df-pss 3953 df-nul 4291 df-if 4467 df-pw 4540 df-sn 4561 df-pr 4563 df-tp 4565 df-op 4567 df-uni 4832 df-int 4869 df-iun 4913 df-iin 4914 df-br 5059 df-opab 5121 df-mpt 5139 df-tr 5165 df-id 5454 df-eprel 5459 df-po 5468 df-so 5469 df-fr 5508 df-se 5509 df-we 5510 df-xp 5555 df-rel 5556 df-cnv 5557 df-co 5558 df-dm 5559 df-rn 5560 df-res 5561 df-ima 5562 df-pred 6142 df-ord 6188 df-on 6189 df-lim 6190 df-suc 6191 df-iota 6308 df-fun 6351 df-fn 6352 df-f 6353 df-f1 6354 df-fo 6355 df-f1o 6356 df-fv 6357 df-isom 6358 df-riota 7108 df-ov 7153 df-oprab 7154 df-mpo 7155 df-of 7403 df-om 7575 df-1st 7683 df-2nd 7684 df-supp 7825 df-wrecs 7941 df-recs 8002 df-rdg 8040 df-1o 8096 df-2o 8097 df-oadd 8100 df-er 8283 df-map 8402 df-pm 8403 df-ixp 8456 df-en 8504 df-dom 8505 df-sdom 8506 df-fin 8507 df-fsupp 8828 df-fi 8869 df-sup 8900 df-inf 8901 df-oi 8968 df-card 9362 df-pnf 10671 df-mnf 10672 df-xr 10673 df-ltxr 10674 df-le 10675 df-sub 10866 df-neg 10867 df-div 11292 df-nn 11633 df-2 11694 df-3 11695 df-4 11696 df-5 11697 df-6 11698 df-7 11699 df-8 11700 df-9 11701 df-n0 11892 df-z 11976 df-dec 12093 df-uz 12238 df-q 12343 df-rp 12384 df-xneg 12501 df-xadd 12502 df-xmul 12503 df-icc 12739 df-fz 12887 df-fzo 13028 df-seq 13364 df-exp 13424 df-hash 13685 df-cj 14452 df-re 14453 df-im 14454 df-sqrt 14588 df-abs 14589 df-struct 16479 df-ndx 16480 df-slot 16481 df-base 16483 df-sets 16484 df-ress 16485 df-plusg 16572 df-mulr 16573 df-starv 16574 df-sca 16575 df-vsca 16576 df-ip 16577 df-tset 16578 df-ple 16579 df-ds 16581 df-unif 16582 df-hom 16583 df-cco 16584 df-rest 16690 df-topn 16691 df-0g 16709 df-gsum 16710 df-topgen 16711 df-pt 16712 df-prds 16715 df-xrs 16769 df-qtop 16774 df-imas 16775 df-xps 16777 df-mre 16851 df-mrc 16852 df-acs 16854 df-mgm 17846 df-sgrp 17895 df-mnd 17906 df-submnd 17951 df-mulg 18219 df-cntz 18441 df-cmn 18902 df-psmet 20531 df-xmet 20532 df-met 20533 df-bl 20534 df-mopn 20535 df-fbas 20536 df-fg 20537 df-cnfld 20540 df-top 21496 df-topon 21513 df-topsp 21535 df-bases 21548 df-cld 21621 df-ntr 21622 df-cls 21623 df-nei 21700 df-lp 21738 df-perf 21739 df-cn 21829 df-cnp 21830 df-t1 21916 df-haus 21917 df-tx 22164 df-hmeo 22357 df-fil 22448 df-fm 22540 df-flim 22541 df-flf 22542 df-xms 22924 df-ms 22925 df-tms 22926 df-cncf 23480 df-limc 24458 df-dv 24459 |
This theorem is referenced by: fourierdlem58 42443 fourierdlem59 42444 |
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