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Theorem divcncf 25416

Description: The quotient of two continuous complex functions is continuous. (Contributed by Glauco Siliprandi, 11-Dec-2019.)

**Hypotheses**
Ref	Expression
divcncf.1	⊢ (𝜑 → (𝑥 ∈ 𝑋 ↦ 𝐴) ∈ (𝑋–cn→ℂ))
divcncf.2	⊢ (𝜑 → (𝑥 ∈ 𝑋 ↦ 𝐵) ∈ (𝑋–cn→(ℂ ∖ {0})))

**Assertion**
Ref	Expression
divcncf	⊢ (𝜑 → (𝑥 ∈ 𝑋 ↦ (𝐴 / 𝐵)) ∈ (𝑋–cn→ℂ))

Distinct variable groups: 𝑥,𝑋 𝜑,𝑥 Allowed substitution hints: 𝐴(𝑥) 𝐵(𝑥)

Proof of Theorem divcncf Dummy variable 𝑦 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		divcncf.1	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ 𝑋 ↦ 𝐴) ∈ (𝑋–cn→ℂ))
2		cncff 24854	. . . . . 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	fvmptelcdm 7067	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → 𝐴 ∈ ℂ)
5		divcncf.2	. . . . . . 7 ⊢ (𝜑 → (𝑥 ∈ 𝑋 ↦ 𝐵) ∈ (𝑋–cn→(ℂ ∖ {0})))
6		cncff 24854	. . . . . . 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	fvmptelcdm 7067	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → 𝐵 ∈ (ℂ ∖ {0}))
9	8	eldifad 3915	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → 𝐵 ∈ ℂ)
10		eldifsni 4748	. . . . 5 ⊢ (𝐵 ∈ (ℂ ∖ {0}) → 𝐵 ≠ 0)
11	8, 10	syl 17	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → 𝐵 ≠ 0)
12	4, 9, 11	divrecd 11932	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → (𝐴 / 𝐵) = (𝐴 · (1 / 𝐵)))
13	12	mpteq2dva 5193	. 2 ⊢ (𝜑 → (𝑥 ∈ 𝑋 ↦ (𝐴 / 𝐵)) = (𝑥 ∈ 𝑋 ↦ (𝐴 · (1 / 𝐵))))
14	8	ralrimiva 3130	. . . . . 6 ⊢ (𝜑 → ∀𝑥 ∈ 𝑋 𝐵 ∈ (ℂ ∖ {0}))
15		eqidd 2738	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ 𝑋 ↦ 𝐵) = (𝑥 ∈ 𝑋 ↦ 𝐵))
16		eqidd 2738	. . . . . 6 ⊢ (𝜑 → (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)) = (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)))
17	14, 15, 16	fmptcos 7086	. . . . 5 ⊢ (𝜑 → ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)) ∘ (𝑥 ∈ 𝑋 ↦ 𝐵)) = (𝑥 ∈ 𝑋 ↦ ⦋𝐵 / 𝑦⦌(1 / 𝑦)))
18		csbov2g 7416	. . . . . . . 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 4388	. . . . . . . . 9 ⊢ (𝐵 ∈ ℂ → ⦋𝐵 / 𝑦⦌𝑦 = 𝐵)
21	9, 20	syl 17	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → ⦋𝐵 / 𝑦⦌𝑦 = 𝐵)
22	21	oveq2d 7384	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → (1 / ⦋𝐵 / 𝑦⦌𝑦) = (1 / 𝐵))
23	19, 22	eqtrd 2772	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → ⦋𝐵 / 𝑦⦌(1 / 𝑦) = (1 / 𝐵))
24	23	mpteq2dva 5193	. . . . 5 ⊢ (𝜑 → (𝑥 ∈ 𝑋 ↦ ⦋𝐵 / 𝑦⦌(1 / 𝑦)) = (𝑥 ∈ 𝑋 ↦ (1 / 𝐵)))
25	17, 24	eqtr2d 2773	. . . 4 ⊢ (𝜑 → (𝑥 ∈ 𝑋 ↦ (1 / 𝐵)) = ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)) ∘ (𝑥 ∈ 𝑋 ↦ 𝐵)))
26		ax-1cn 11096	. . . . . 6 ⊢ 1 ∈ ℂ
27		eqid 2737	. . . . . . 7 ⊢ (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)) = (𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦))
28	27	cdivcncf 24882	. . . . . 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 24868	. . . 4 ⊢ (𝜑 → ((𝑦 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑦)) ∘ (𝑥 ∈ 𝑋 ↦ 𝐵)) ∈ (𝑋–cn→ℂ))
31	25, 30	eqeltrd 2837	. . 3 ⊢ (𝜑 → (𝑥 ∈ 𝑋 ↦ (1 / 𝐵)) ∈ (𝑋–cn→ℂ))
32	1, 31	mulcncf 25414	. 2 ⊢ (𝜑 → (𝑥 ∈ 𝑋 ↦ (𝐴 · (1 / 𝐵))) ∈ (𝑋–cn→ℂ))
33	13, 32	eqeltrd 2837	1 ⊢ (𝜑 → (𝑥 ∈ 𝑋 ↦ (𝐴 / 𝐵)) ∈ (𝑋–cn→ℂ))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 = wceq 1542 ∈ wcel 2114 ≠ wne 2933 ⦋csb 3851 ∖ cdif 3900 {csn 4582 ↦ cmpt 5181 ∘ ccom 5636 ⟶wf 6496 (class class class)co 7368 ℂcc 11036 0cc0 11038 1c1 11039 · cmul 11043 / cdiv 11806 –cn→ccncf 24837

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-rep 5226 ax-sep 5243 ax-nul 5253 ax-pow 5312 ax-pr 5379 ax-un 7690 ax-cnex 11094 ax-resscn 11095 ax-1cn 11096 ax-icn 11097 ax-addcl 11098 ax-addrcl 11099 ax-mulcl 11100 ax-mulrcl 11101 ax-mulcom 11102 ax-addass 11103 ax-mulass 11104 ax-distr 11105 ax-i2m1 11106 ax-1ne0 11107 ax-1rid 11108 ax-rnegex 11109 ax-rrecex 11110 ax-cnre 11111 ax-pre-lttri 11112 ax-pre-lttrn 11113 ax-pre-ltadd 11114 ax-pre-mulgt0 11115 ax-pre-sup 11116

This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3063 df-rmo 3352 df-reu 3353 df-rab 3402 df-v 3444 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-pss 3923 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-tp 4587 df-op 4589 df-uni 4866 df-int 4905 df-iun 4950 df-iin 4951 df-br 5101 df-opab 5163 df-mpt 5182 df-tr 5208 df-id 5527 df-eprel 5532 df-po 5540 df-so 5541 df-fr 5585 df-se 5586 df-we 5587 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-rn 5643 df-res 5644 df-ima 5645 df-pred 6267 df-ord 6328 df-on 6329 df-lim 6330 df-suc 6331 df-iota 6456 df-fun 6502 df-fn 6503 df-f 6504 df-f1 6505 df-fo 6506 df-f1o 6507 df-fv 6508 df-isom 6509 df-riota 7325 df-ov 7371 df-oprab 7372 df-mpo 7373 df-of 7632 df-om 7819 df-1st 7943 df-2nd 7944 df-supp 8113 df-frecs 8233 df-wrecs 8264 df-recs 8313 df-rdg 8351 df-1o 8407 df-2o 8408 df-er 8645 df-map 8777 df-ixp 8848 df-en 8896 df-dom 8897 df-sdom 8898 df-fin 8899 df-fsupp 9277 df-fi 9326 df-sup 9357 df-inf 9358 df-oi 9427 df-card 9863 df-pnf 11180 df-mnf 11181 df-xr 11182 df-ltxr 11183 df-le 11184 df-sub 11378 df-neg 11379 df-div 11807 df-nn 12158 df-2 12220 df-3 12221 df-4 12222 df-5 12223 df-6 12224 df-7 12225 df-8 12226 df-9 12227 df-n0 12414 df-z 12501 df-dec 12620 df-uz 12764 df-q 12874 df-rp 12918 df-xneg 13038 df-xadd 13039 df-xmul 13040 df-icc 13280 df-fz 13436 df-fzo 13583 df-seq 13937 df-exp 13997 df-hash 14266 df-cj 15034 df-re 15035 df-im 15036 df-sqrt 15170 df-abs 15171 df-struct 17086 df-sets 17103 df-slot 17121 df-ndx 17133 df-base 17149 df-ress 17170 df-plusg 17202 df-mulr 17203 df-starv 17204 df-sca 17205 df-vsca 17206 df-ip 17207 df-tset 17208 df-ple 17209 df-ds 17211 df-unif 17212 df-hom 17213 df-cco 17214 df-rest 17354 df-topn 17355 df-0g 17373 df-gsum 17374 df-topgen 17375 df-pt 17376 df-prds 17379 df-xrs 17435 df-qtop 17440 df-imas 17441 df-xps 17443 df-mre 17517 df-mrc 17518 df-acs 17520 df-mgm 18577 df-sgrp 18656 df-mnd 18672 df-submnd 18721 df-mulg 19010 df-cntz 19258 df-cmn 19723 df-psmet 21313 df-xmet 21314 df-met 21315 df-bl 21316 df-mopn 21317 df-cnfld 21322 df-top 22850 df-topon 22867 df-topsp 22889 df-bases 22902 df-cn 23183 df-cnp 23184 df-tx 23518 df-hmeo 23711 df-xms 24276 df-ms 24277 df-tms 24278 df-cncf 24839

This theorem is referenced by: logdivsqrle 34827 divcncff 46243 itgcoscmulx 46321 itgsincmulx 46326 dirkeritg 46454 dirkercncflem2 46456 fourierdlem39 46498 fourierdlem58 46516 fourierdlem62 46520 fourierdlem68 46526 fourierdlem76 46534

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