dvdivf - Mathbox for Glauco Siliprandi

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Theorem dvdivf 38812

Description: The quotient rule for everywhere-differentiable functions. (Contributed by Glauco Siliprandi, 11-Dec-2019.)

**Hypotheses**
Ref	Expression
dvdivf.s	⊢ (𝜑 → 𝑆 ∈ {ℝ, ℂ})
dvdivf.f	⊢ (𝜑 → 𝐹:𝑋⟶ℂ)
dvdivf.g	⊢ (𝜑 → 𝐺:𝑋⟶(ℂ ∖ {0}))
dvdivf.fdv	⊢ (𝜑 → dom (𝑆 D 𝐹) = 𝑋)
dvdivf.gdv	⊢ (𝜑 → dom (𝑆 D 𝐺) = 𝑋)

**Assertion**
Ref	Expression
dvdivf	⊢ (𝜑 → (𝑆 D (𝐹 ∘_𝑓 / 𝐺)) = ((((𝑆 D 𝐹) ∘_𝑓 · 𝐺) ∘_𝑓 − ((𝑆 D 𝐺) ∘_𝑓 · 𝐹)) ∘_𝑓 / (𝐺 ∘_𝑓 · 𝐺)))

Proof of Theorem dvdivf Dummy variable 𝑥 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		dvdivf.s	. . 3 ⊢ (𝜑 → 𝑆 ∈ {ℝ, ℂ})
2		dvdivf.f	. . . 4 ⊢ (𝜑 → 𝐹:𝑋⟶ℂ)
3	2	ffvelrnda 6267	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → (𝐹‘𝑥) ∈ ℂ)
4		dvfg 23476	. . . . . 6 ⊢ (𝑆 ∈ {ℝ, ℂ} → (𝑆 D 𝐹):dom (𝑆 D 𝐹)⟶ℂ)
5	1, 4	syl 17	. . . . 5 ⊢ (𝜑 → (𝑆 D 𝐹):dom (𝑆 D 𝐹)⟶ℂ)
6		dvdivf.fdv	. . . . . 6 ⊢ (𝜑 → dom (𝑆 D 𝐹) = 𝑋)
7	6	feq2d 5944	. . . . 5 ⊢ (𝜑 → ((𝑆 D 𝐹):dom (𝑆 D 𝐹)⟶ℂ ↔ (𝑆 D 𝐹):𝑋⟶ℂ))
8	5, 7	mpbid 221	. . . 4 ⊢ (𝜑 → (𝑆 D 𝐹):𝑋⟶ℂ)
9	8	ffvelrnda 6267	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → ((𝑆 D 𝐹)‘𝑥) ∈ ℂ)
10	2	feqmptd 6159	. . . . 5 ⊢ (𝜑 → 𝐹 = (𝑥 ∈ 𝑋 ↦ (𝐹‘𝑥)))
11	10	oveq2d 6565	. . . 4 ⊢ (𝜑 → (𝑆 D 𝐹) = (𝑆 D (𝑥 ∈ 𝑋 ↦ (𝐹‘𝑥))))
12	8	feqmptd 6159	. . . 4 ⊢ (𝜑 → (𝑆 D 𝐹) = (𝑥 ∈ 𝑋 ↦ ((𝑆 D 𝐹)‘𝑥)))
13	11, 12	eqtr3d 2646	. . 3 ⊢ (𝜑 → (𝑆 D (𝑥 ∈ 𝑋 ↦ (𝐹‘𝑥))) = (𝑥 ∈ 𝑋 ↦ ((𝑆 D 𝐹)‘𝑥)))
14		dvdivf.g	. . . 4 ⊢ (𝜑 → 𝐺:𝑋⟶(ℂ ∖ {0}))
15	14	ffvelrnda 6267	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → (𝐺‘𝑥) ∈ (ℂ ∖ {0}))
16		dvfg 23476	. . . . . 6 ⊢ (𝑆 ∈ {ℝ, ℂ} → (𝑆 D 𝐺):dom (𝑆 D 𝐺)⟶ℂ)
17	1, 16	syl 17	. . . . 5 ⊢ (𝜑 → (𝑆 D 𝐺):dom (𝑆 D 𝐺)⟶ℂ)
18		dvdivf.gdv	. . . . . 6 ⊢ (𝜑 → dom (𝑆 D 𝐺) = 𝑋)
19	18	feq2d 5944	. . . . 5 ⊢ (𝜑 → ((𝑆 D 𝐺):dom (𝑆 D 𝐺)⟶ℂ ↔ (𝑆 D 𝐺):𝑋⟶ℂ))
20	17, 19	mpbid 221	. . . 4 ⊢ (𝜑 → (𝑆 D 𝐺):𝑋⟶ℂ)
21	20	ffvelrnda 6267	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → ((𝑆 D 𝐺)‘𝑥) ∈ ℂ)
22	14	feqmptd 6159	. . . . 5 ⊢ (𝜑 → 𝐺 = (𝑥 ∈ 𝑋 ↦ (𝐺‘𝑥)))
23	22	oveq2d 6565	. . . 4 ⊢ (𝜑 → (𝑆 D 𝐺) = (𝑆 D (𝑥 ∈ 𝑋 ↦ (𝐺‘𝑥))))
24	20	feqmptd 6159	. . . 4 ⊢ (𝜑 → (𝑆 D 𝐺) = (𝑥 ∈ 𝑋 ↦ ((𝑆 D 𝐺)‘𝑥)))
25	23, 24	eqtr3d 2646	. . 3 ⊢ (𝜑 → (𝑆 D (𝑥 ∈ 𝑋 ↦ (𝐺‘𝑥))) = (𝑥 ∈ 𝑋 ↦ ((𝑆 D 𝐺)‘𝑥)))
26	1, 3, 9, 13, 15, 21, 25	dvmptdiv 38807	. 2 ⊢ (𝜑 → (𝑆 D (𝑥 ∈ 𝑋 ↦ ((𝐹‘𝑥) / (𝐺‘𝑥)))) = (𝑥 ∈ 𝑋 ↦ (((((𝑆 D 𝐹)‘𝑥) · (𝐺‘𝑥)) − (((𝑆 D 𝐺)‘𝑥) · (𝐹‘𝑥))) / ((𝐺‘𝑥)↑2))))
27		ovex 6577	. . . . . 6 ⊢ (𝑆 D 𝐹) ∈ V
28	27	dmex 6991	. . . . 5 ⊢ dom (𝑆 D 𝐹) ∈ V
29	6, 28	syl6eqelr 2697	. . . 4 ⊢ (𝜑 → 𝑋 ∈ V)
30	29, 3, 15, 10, 22	offval2 6812	. . 3 ⊢ (𝜑 → (𝐹 ∘_𝑓 / 𝐺) = (𝑥 ∈ 𝑋 ↦ ((𝐹‘𝑥) / (𝐺‘𝑥))))
31	30	oveq2d 6565	. 2 ⊢ (𝜑 → (𝑆 D (𝐹 ∘_𝑓 / 𝐺)) = (𝑆 D (𝑥 ∈ 𝑋 ↦ ((𝐹‘𝑥) / (𝐺‘𝑥)))))
32		ovex 6577	. . . 4 ⊢ ((((𝑆 D 𝐹)‘𝑥) · (𝐺‘𝑥)) − (((𝑆 D 𝐺)‘𝑥) · (𝐹‘𝑥))) ∈ V
33	32	a1i 11	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → ((((𝑆 D 𝐹)‘𝑥) · (𝐺‘𝑥)) − (((𝑆 D 𝐺)‘𝑥) · (𝐹‘𝑥))) ∈ V)
34	15	eldifad 3552	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → (𝐺‘𝑥) ∈ ℂ)
35	34	sqcld 12868	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → ((𝐺‘𝑥)↑2) ∈ ℂ)
36	9, 34	mulcld 9939	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → (((𝑆 D 𝐹)‘𝑥) · (𝐺‘𝑥)) ∈ ℂ)
37	21, 3	mulcld 9939	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → (((𝑆 D 𝐺)‘𝑥) · (𝐹‘𝑥)) ∈ ℂ)
38	29, 9, 34, 12, 22	offval2 6812	. . . 4 ⊢ (𝜑 → ((𝑆 D 𝐹) ∘_𝑓 · 𝐺) = (𝑥 ∈ 𝑋 ↦ (((𝑆 D 𝐹)‘𝑥) · (𝐺‘𝑥))))
39	29, 21, 3, 24, 10	offval2 6812	. . . 4 ⊢ (𝜑 → ((𝑆 D 𝐺) ∘_𝑓 · 𝐹) = (𝑥 ∈ 𝑋 ↦ (((𝑆 D 𝐺)‘𝑥) · (𝐹‘𝑥))))
40	29, 36, 37, 38, 39	offval2 6812	. . 3 ⊢ (𝜑 → (((𝑆 D 𝐹) ∘_𝑓 · 𝐺) ∘_𝑓 − ((𝑆 D 𝐺) ∘_𝑓 · 𝐹)) = (𝑥 ∈ 𝑋 ↦ ((((𝑆 D 𝐹)‘𝑥) · (𝐺‘𝑥)) − (((𝑆 D 𝐺)‘𝑥) · (𝐹‘𝑥)))))
41	29, 15, 15, 22, 22	offval2 6812	. . . 4 ⊢ (𝜑 → (𝐺 ∘_𝑓 · 𝐺) = (𝑥 ∈ 𝑋 ↦ ((𝐺‘𝑥) · (𝐺‘𝑥))))
42	34	sqvald 12867	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → ((𝐺‘𝑥)↑2) = ((𝐺‘𝑥) · (𝐺‘𝑥)))
43	42	mpteq2dva 4672	. . . 4 ⊢ (𝜑 → (𝑥 ∈ 𝑋 ↦ ((𝐺‘𝑥)↑2)) = (𝑥 ∈ 𝑋 ↦ ((𝐺‘𝑥) · (𝐺‘𝑥))))
44	41, 43	eqtr4d 2647	. . 3 ⊢ (𝜑 → (𝐺 ∘_𝑓 · 𝐺) = (𝑥 ∈ 𝑋 ↦ ((𝐺‘𝑥)↑2)))
45	29, 33, 35, 40, 44	offval2 6812	. 2 ⊢ (𝜑 → ((((𝑆 D 𝐹) ∘_𝑓 · 𝐺) ∘_𝑓 − ((𝑆 D 𝐺) ∘_𝑓 · 𝐹)) ∘_𝑓 / (𝐺 ∘_𝑓 · 𝐺)) = (𝑥 ∈ 𝑋 ↦ (((((𝑆 D 𝐹)‘𝑥) · (𝐺‘𝑥)) − (((𝑆 D 𝐺)‘𝑥) · (𝐹‘𝑥))) / ((𝐺‘𝑥)↑2))))
46	26, 31, 45	3eqtr4d 2654	1 ⊢ (𝜑 → (𝑆 D (𝐹 ∘_𝑓 / 𝐺)) = ((((𝑆 D 𝐹) ∘_𝑓 · 𝐺) ∘_𝑓 − ((𝑆 D 𝐺) ∘_𝑓 · 𝐹)) ∘_𝑓 / (𝐺 ∘_𝑓 · 𝐺)))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 383 = wceq 1475 ∈ wcel 1977 Vcvv 3173 ∖ cdif 3537 {csn 4125 {cpr 4127 ↦ cmpt 4643 dom cdm 5038 ⟶wf 5800 ‘cfv 5804 (class class class)co 6549 ∘_𝑓 cof 6793 ℂcc 9813 ℝcr 9814 0cc0 9815 · cmul 9820 − cmin 10145 / cdiv 10563 2c2 10947 ↑cexp 12722 D cdv 23433

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-8 1979 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-rep 4699 ax-sep 4709 ax-nul 4717 ax-pow 4769 ax-pr 4833 ax-un 6847 ax-inf2 8421 ax-cnex 9871 ax-resscn 9872 ax-1cn 9873 ax-icn 9874 ax-addcl 9875 ax-addrcl 9876 ax-mulcl 9877 ax-mulrcl 9878 ax-mulcom 9879 ax-addass 9880 ax-mulass 9881 ax-distr 9882 ax-i2m1 9883 ax-1ne0 9884 ax-1rid 9885 ax-rnegex 9886 ax-rrecex 9887 ax-cnre 9888 ax-pre-lttri 9889 ax-pre-lttrn 9890 ax-pre-ltadd 9891 ax-pre-mulgt0 9892 ax-pre-sup 9893 ax-addf 9894 ax-mulf 9895

This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3or 1032 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-nel 2783 df-ral 2901 df-rex 2902 df-reu 2903 df-rmo 2904 df-rab 2905 df-v 3175 df-sbc 3403 df-csb 3500 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-pss 3556 df-nul 3875 df-if 4037 df-pw 4110 df-sn 4126 df-pr 4128 df-tp 4130 df-op 4132 df-uni 4373 df-int 4411 df-iun 4457 df-iin 4458 df-br 4584 df-opab 4644 df-mpt 4645 df-tr 4681 df-eprel 4949 df-id 4953 df-po 4959 df-so 4960 df-fr 4997 df-se 4998 df-we 4999 df-xp 5044 df-rel 5045 df-cnv 5046 df-co 5047 df-dm 5048 df-rn 5049 df-res 5050 df-ima 5051 df-pred 5597 df-ord 5643 df-on 5644 df-lim 5645 df-suc 5646 df-iota 5768 df-fun 5806 df-fn 5807 df-f 5808 df-f1 5809 df-fo 5810 df-f1o 5811 df-fv 5812 df-isom 5813 df-riota 6511 df-ov 6552 df-oprab 6553 df-mpt2 6554 df-of 6795 df-om 6958 df-1st 7059 df-2nd 7060 df-supp 7183 df-wrecs 7294 df-recs 7355 df-rdg 7393 df-1o 7447 df-2o 7448 df-oadd 7451 df-er 7629 df-map 7746 df-pm 7747 df-ixp 7795 df-en 7842 df-dom 7843 df-sdom 7844 df-fin 7845 df-fsupp 8159 df-fi 8200 df-sup 8231 df-inf 8232 df-oi 8298 df-card 8648 df-cda 8873 df-pnf 9955 df-mnf 9956 df-xr 9957 df-ltxr 9958 df-le 9959 df-sub 10147 df-neg 10148 df-div 10564 df-nn 10898 df-2 10956 df-3 10957 df-4 10958 df-5 10959 df-6 10960 df-7 10961 df-8 10962 df-9 10963 df-n0 11170 df-z 11255 df-dec 11370 df-uz 11564 df-q 11665 df-rp 11709 df-xneg 11822 df-xadd 11823 df-xmul 11824 df-icc 12053 df-fz 12198 df-fzo 12335 df-seq 12664 df-exp 12723 df-hash 12980 df-cj 13687 df-re 13688 df-im 13689 df-sqrt 13823 df-abs 13824 df-struct 15697 df-ndx 15698 df-slot 15699 df-base 15700 df-sets 15701 df-ress 15702 df-plusg 15781 df-mulr 15782 df-starv 15783 df-sca 15784 df-vsca 15785 df-ip 15786 df-tset 15787 df-ple 15788 df-ds 15791 df-unif 15792 df-hom 15793 df-cco 15794 df-rest 15906 df-topn 15907 df-0g 15925 df-gsum 15926 df-topgen 15927 df-pt 15928 df-prds 15931 df-xrs 15985 df-qtop 15990 df-imas 15991 df-xps 15993 df-mre 16069 df-mrc 16070 df-acs 16072 df-mgm 17065 df-sgrp 17107 df-mnd 17118 df-submnd 17159 df-mulg 17364 df-cntz 17573 df-cmn 18018 df-psmet 19559 df-xmet 19560 df-met 19561 df-bl 19562 df-mopn 19563 df-fbas 19564 df-fg 19565 df-cnfld 19568 df-top 20521 df-bases 20522 df-topon 20523 df-topsp 20524 df-cld 20633 df-ntr 20634 df-cls 20635 df-nei 20712 df-lp 20750 df-perf 20751 df-cn 20841 df-cnp 20842 df-t1 20928 df-haus 20929 df-tx 21175 df-hmeo 21368 df-fil 21460 df-fm 21552 df-flim 21553 df-flf 21554 df-xms 21935 df-ms 21936 df-tms 21937 df-cncf 22489 df-limc 23436 df-dv 23437

This theorem is referenced by: dvdivcncf 38817

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