divlimc - Mathbox for Glauco Siliprandi

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Theorem divlimc 45044

Description: Limit of the quotient of two functions. (Contributed by Glauco Siliprandi, 11-Dec-2019.)

**Hypotheses**
Ref	Expression
divlimc.f	⊢ 𝐹 = (𝑥 ∈ 𝐴 ↦ 𝐵)
divlimc.g	⊢ 𝐺 = (𝑥 ∈ 𝐴 ↦ 𝐶)
divlimc.h	⊢ 𝐻 = (𝑥 ∈ 𝐴 ↦ (𝐵 / 𝐶))
divlimc.b	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℂ)
divlimc.c	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐶 ∈ (ℂ ∖ {0}))
divlimc.x	⊢ (𝜑 → 𝑋 ∈ (𝐹 lim_ℂ 𝐷))
divlimc.y	⊢ (𝜑 → 𝑌 ∈ (𝐺 lim_ℂ 𝐷))
divlimc.yne0	⊢ (𝜑 → 𝑌 ≠ 0)
divlimc.cne0	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐶 ≠ 0)

**Assertion**
Ref	Expression
divlimc	⊢ (𝜑 → (𝑋 / 𝑌) ∈ (𝐻 lim_ℂ 𝐷))

Distinct variable groups: 𝑥,𝐴 𝑥,𝐷 𝑥,𝑋 𝑥,𝑌 𝜑,𝑥 Allowed substitution hints: 𝐵(𝑥) 𝐶(𝑥) 𝐹(𝑥) 𝐺(𝑥) 𝐻(𝑥)

**Proof of Theorem divlimc**
Step	Hyp	Ref	Expression
1		divlimc.f	. . 3 ⊢ 𝐹 = (𝑥 ∈ 𝐴 ↦ 𝐵)
2		eqid 2728	. . 3 ⊢ (𝑥 ∈ 𝐴 ↦ (1 / 𝐶)) = (𝑥 ∈ 𝐴 ↦ (1 / 𝐶))
3		eqid 2728	. . 3 ⊢ (𝑥 ∈ 𝐴 ↦ (𝐵 · (1 / 𝐶))) = (𝑥 ∈ 𝐴 ↦ (𝐵 · (1 / 𝐶)))
4		divlimc.b	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℂ)
5		divlimc.c	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐶 ∈ (ℂ ∖ {0}))
6	5	eldifad 3959	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐶 ∈ ℂ)
7		divlimc.cne0	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐶 ≠ 0)
8	6, 7	reccld 12014	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (1 / 𝐶) ∈ ℂ)
9		divlimc.x	. . 3 ⊢ (𝜑 → 𝑋 ∈ (𝐹 lim_ℂ 𝐷))
10		divlimc.g	. . . 4 ⊢ 𝐺 = (𝑥 ∈ 𝐴 ↦ 𝐶)
11		divlimc.y	. . . 4 ⊢ (𝜑 → 𝑌 ∈ (𝐺 lim_ℂ 𝐷))
12		divlimc.yne0	. . . 4 ⊢ (𝜑 → 𝑌 ≠ 0)
13	10, 2, 5, 11, 12	reclimc 45041	. . 3 ⊢ (𝜑 → (1 / 𝑌) ∈ ((𝑥 ∈ 𝐴 ↦ (1 / 𝐶)) lim_ℂ 𝐷))
14	1, 2, 3, 4, 8, 9, 13	mullimc 45004	. 2 ⊢ (𝜑 → (𝑋 · (1 / 𝑌)) ∈ ((𝑥 ∈ 𝐴 ↦ (𝐵 · (1 / 𝐶))) lim_ℂ 𝐷))
15		limccl 25817	. . . 4 ⊢ (𝐹 lim_ℂ 𝐷) ⊆ ℂ
16	15, 9	sselid 3978	. . 3 ⊢ (𝜑 → 𝑋 ∈ ℂ)
17		limccl 25817	. . . 4 ⊢ (𝐺 lim_ℂ 𝐷) ⊆ ℂ
18	17, 11	sselid 3978	. . 3 ⊢ (𝜑 → 𝑌 ∈ ℂ)
19	16, 18, 12	divrecd 12024	. 2 ⊢ (𝜑 → (𝑋 / 𝑌) = (𝑋 · (1 / 𝑌)))
20		divlimc.h	. . . 4 ⊢ 𝐻 = (𝑥 ∈ 𝐴 ↦ (𝐵 / 𝐶))
21	4, 6, 7	divrecd 12024	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (𝐵 / 𝐶) = (𝐵 · (1 / 𝐶)))
22	21	mpteq2dva 5248	. . . 4 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ (𝐵 / 𝐶)) = (𝑥 ∈ 𝐴 ↦ (𝐵 · (1 / 𝐶))))
23	20, 22	eqtrid 2780	. . 3 ⊢ (𝜑 → 𝐻 = (𝑥 ∈ 𝐴 ↦ (𝐵 · (1 / 𝐶))))
24	23	oveq1d 7435	. 2 ⊢ (𝜑 → (𝐻 lim_ℂ 𝐷) = ((𝑥 ∈ 𝐴 ↦ (𝐵 · (1 / 𝐶))) lim_ℂ 𝐷))
25	14, 19, 24	3eltr4d 2844	1 ⊢ (𝜑 → (𝑋 / 𝑌) ∈ (𝐻 lim_ℂ 𝐷))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 = wceq 1534 ∈ wcel 2099 ≠ wne 2937 ∖ cdif 3944 {csn 4629 ↦ cmpt 5231 (class class class)co 7420 ℂcc 11137 0cc0 11139 1c1 11140 · cmul 11144 / cdiv 11902 lim_ℂ climc 25804

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2167 ax-ext 2699 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5365 ax-pr 5429 ax-un 7740 ax-cnex 11195 ax-resscn 11196 ax-1cn 11197 ax-icn 11198 ax-addcl 11199 ax-addrcl 11200 ax-mulcl 11201 ax-mulrcl 11202 ax-mulcom 11203 ax-addass 11204 ax-mulass 11205 ax-distr 11206 ax-i2m1 11207 ax-1ne0 11208 ax-1rid 11209 ax-rnegex 11210 ax-rrecex 11211 ax-cnre 11212 ax-pre-lttri 11213 ax-pre-lttrn 11214 ax-pre-ltadd 11215 ax-pre-mulgt0 11216 ax-pre-sup 11217

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2530 df-eu 2559 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2938 df-nel 3044 df-ral 3059 df-rex 3068 df-rmo 3373 df-reu 3374 df-rab 3430 df-v 3473 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-tp 4634 df-op 4636 df-uni 4909 df-int 4950 df-iun 4998 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5576 df-eprel 5582 df-po 5590 df-so 5591 df-fr 5633 df-we 5635 df-xp 5684 df-rel 5685 df-cnv 5686 df-co 5687 df-dm 5688 df-rn 5689 df-res 5690 df-ima 5691 df-pred 6305 df-ord 6372 df-on 6373 df-lim 6374 df-suc 6375 df-iota 6500 df-fun 6550 df-fn 6551 df-f 6552 df-f1 6553 df-fo 6554 df-f1o 6555 df-fv 6556 df-riota 7376 df-ov 7423 df-oprab 7424 df-mpo 7425 df-om 7871 df-1st 7993 df-2nd 7994 df-frecs 8287 df-wrecs 8318 df-recs 8392 df-rdg 8431 df-1o 8487 df-er 8725 df-map 8847 df-pm 8848 df-en 8965 df-dom 8966 df-sdom 8967 df-fin 8968 df-fi 9435 df-sup 9466 df-inf 9467 df-pnf 11281 df-mnf 11282 df-xr 11283 df-ltxr 11284 df-le 11285 df-sub 11477 df-neg 11478 df-div 11903 df-nn 12244 df-2 12306 df-3 12307 df-4 12308 df-5 12309 df-6 12310 df-7 12311 df-8 12312 df-9 12313 df-n0 12504 df-z 12590 df-dec 12709 df-uz 12854 df-q 12964 df-rp 13008 df-xneg 13125 df-xadd 13126 df-xmul 13127 df-fz 13518 df-seq 14000 df-exp 14060 df-cj 15079 df-re 15080 df-im 15081 df-sqrt 15215 df-abs 15216 df-struct 17116 df-slot 17151 df-ndx 17163 df-base 17181 df-plusg 17246 df-mulr 17247 df-starv 17248 df-tset 17252 df-ple 17253 df-ds 17255 df-unif 17256 df-rest 17404 df-topn 17405 df-topgen 17425 df-psmet 21271 df-xmet 21272 df-met 21273 df-bl 21274 df-mopn 21275 df-cnfld 21280 df-top 22809 df-topon 22826 df-topsp 22848 df-bases 22862 df-cnp 23145 df-xms 24239 df-ms 24240 df-limc 25808

This theorem is referenced by: fourierdlem74 45568 fourierdlem75 45569 fourierdlem76 45570

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