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Theorem climcncf 24819

Description: Image of a limit under a continuous map. (Contributed by Mario Carneiro, 7-Apr-2015.)

**Hypotheses**
Ref	Expression
climcncf.1	⊢ 𝑍 = (ℤ_≥‘𝑀)
climcncf.2	⊢ (𝜑 → 𝑀 ∈ ℤ)
climcncf.4	⊢ (𝜑 → 𝐹 ∈ (𝐴–cn→𝐵))
climcncf.5	⊢ (𝜑 → 𝐺:𝑍⟶𝐴)
climcncf.6	⊢ (𝜑 → 𝐺 ⇝ 𝐷)
climcncf.7	⊢ (𝜑 → 𝐷 ∈ 𝐴)

**Assertion**
Ref	Expression
climcncf	⊢ (𝜑 → (𝐹 ∘ 𝐺) ⇝ (𝐹‘𝐷))

Proof of Theorem climcncf Dummy variables 𝑦 𝑧 𝑥 𝑘 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		climcncf.1	. 2 ⊢ 𝑍 = (ℤ_≥‘𝑀)
2		climcncf.2	. 2 ⊢ (𝜑 → 𝑀 ∈ ℤ)
3		climcncf.7	. 2 ⊢ (𝜑 → 𝐷 ∈ 𝐴)
4		climcncf.4	. . . . 5 ⊢ (𝜑 → 𝐹 ∈ (𝐴–cn→𝐵))
5		cncff 24812	. . . . 5 ⊢ (𝐹 ∈ (𝐴–cn→𝐵) → 𝐹:𝐴⟶𝐵)
6	4, 5	syl 17	. . . 4 ⊢ (𝜑 → 𝐹:𝐴⟶𝐵)
7	6	ffvelcdmda 7094	. . 3 ⊢ ((𝜑 ∧ 𝑧 ∈ 𝐴) → (𝐹‘𝑧) ∈ 𝐵)
8		cncfrss2 24811	. . . . 5 ⊢ (𝐹 ∈ (𝐴–cn→𝐵) → 𝐵 ⊆ ℂ)
9	4, 8	syl 17	. . . 4 ⊢ (𝜑 → 𝐵 ⊆ ℂ)
10	9	sselda 3980	. . 3 ⊢ ((𝜑 ∧ (𝐹‘𝑧) ∈ 𝐵) → (𝐹‘𝑧) ∈ ℂ)
11	7, 10	syldan 590	. 2 ⊢ ((𝜑 ∧ 𝑧 ∈ 𝐴) → (𝐹‘𝑧) ∈ ℂ)
12		climcncf.6	. 2 ⊢ (𝜑 → 𝐺 ⇝ 𝐷)
13		climcncf.5	. . . 4 ⊢ (𝜑 → 𝐺:𝑍⟶𝐴)
14	1	fvexi 6911	. . . 4 ⊢ 𝑍 ∈ V
15		fex 7238	. . . 4 ⊢ ((𝐺:𝑍⟶𝐴 ∧ 𝑍 ∈ V) → 𝐺 ∈ V)
16	13, 14, 15	sylancl 585	. . 3 ⊢ (𝜑 → 𝐺 ∈ V)
17		coexg 7937	. . 3 ⊢ ((𝐹 ∈ (𝐴–cn→𝐵) ∧ 𝐺 ∈ V) → (𝐹 ∘ 𝐺) ∈ V)
18	4, 16, 17	syl2anc 583	. 2 ⊢ (𝜑 → (𝐹 ∘ 𝐺) ∈ V)
19		cncfi 24813	. . . . 5 ⊢ ((𝐹 ∈ (𝐴–cn→𝐵) ∧ 𝐷 ∈ 𝐴 ∧ 𝑥 ∈ ℝ⁺) → ∃𝑦 ∈ ℝ⁺ ∀𝑧 ∈ 𝐴 ((abs‘(𝑧 − 𝐷)) < 𝑦 → (abs‘((𝐹‘𝑧) − (𝐹‘𝐷))) < 𝑥))
20	19	3expia 1119	. . . 4 ⊢ ((𝐹 ∈ (𝐴–cn→𝐵) ∧ 𝐷 ∈ 𝐴) → (𝑥 ∈ ℝ⁺ → ∃𝑦 ∈ ℝ⁺ ∀𝑧 ∈ 𝐴 ((abs‘(𝑧 − 𝐷)) < 𝑦 → (abs‘((𝐹‘𝑧) − (𝐹‘𝐷))) < 𝑥)))
21	4, 3, 20	syl2anc 583	. . 3 ⊢ (𝜑 → (𝑥 ∈ ℝ⁺ → ∃𝑦 ∈ ℝ⁺ ∀𝑧 ∈ 𝐴 ((abs‘(𝑧 − 𝐷)) < 𝑦 → (abs‘((𝐹‘𝑧) − (𝐹‘𝐷))) < 𝑥)))
22	21	imp 406	. 2 ⊢ ((𝜑 ∧ 𝑥 ∈ ℝ⁺) → ∃𝑦 ∈ ℝ⁺ ∀𝑧 ∈ 𝐴 ((abs‘(𝑧 − 𝐷)) < 𝑦 → (abs‘((𝐹‘𝑧) − (𝐹‘𝐷))) < 𝑥))
23	13	ffvelcdmda 7094	. 2 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → (𝐺‘𝑘) ∈ 𝐴)
24		fvco3 6997	. . 3 ⊢ ((𝐺:𝑍⟶𝐴 ∧ 𝑘 ∈ 𝑍) → ((𝐹 ∘ 𝐺)‘𝑘) = (𝐹‘(𝐺‘𝑘)))
25	13, 24	sylan 579	. 2 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → ((𝐹 ∘ 𝐺)‘𝑘) = (𝐹‘(𝐺‘𝑘)))
26	1, 2, 3, 11, 12, 18, 22, 23, 25	climcn1 15568	1 ⊢ (𝜑 → (𝐹 ∘ 𝐺) ⇝ (𝐹‘𝐷))

Colors of variables: wff setvar class

Syntax hints: → wi 4 = wceq 1534 ∈ wcel 2099 ∀wral 3058 ∃wrex 3067 Vcvv 3471 ⊆ wss 3947 class class class wbr 5148 ∘ ccom 5682 ⟶wf 6544 ‘cfv 6548 (class class class)co 7420 ℂcc 11136 < clt 11278 − cmin 11474 ℤcz 12588 ℤ_≥cuz 12852 ℝ⁺crp 13006 abscabs 15213 ⇝ cli 15460 –cn→ccncf 24795

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 11194 ax-resscn 11195 ax-1cn 11196 ax-icn 11197 ax-addcl 11198 ax-addrcl 11199 ax-mulcl 11200 ax-mulrcl 11201 ax-mulcom 11202 ax-addass 11203 ax-mulass 11204 ax-distr 11205 ax-i2m1 11206 ax-1ne0 11207 ax-1rid 11208 ax-rnegex 11209 ax-rrecex 11210 ax-cnre 11211 ax-pre-lttri 11212 ax-pre-lttrn 11213 ax-pre-ltadd 11214 ax-pre-mulgt0 11215

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-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4909 df-iun 4998 df-br 5149 df-opab 5211 df-mpt 5232 df-id 5576 df-po 5590 df-so 5591 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-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-er 8724 df-map 8846 df-en 8964 df-dom 8965 df-sdom 8966 df-pnf 11280 df-mnf 11281 df-xr 11282 df-ltxr 11283 df-le 11284 df-sub 11476 df-neg 11477 df-div 11902 df-2 12305 df-z 12589 df-uz 12853 df-cj 15078 df-re 15079 df-im 15080 df-abs 15215 df-clim 15464 df-cncf 24797

This theorem is referenced by: leibpi 26873 lgamcvg2 26986 gamcvg 26987 iprodefisum 35335 climexp 44993 fprodsubrecnncnvlem 45295 fprodaddrecnncnvlem 45297 stirlinglem14 45475

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