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Theorem ntrivcvgtail 15850

Description: A tail of a non-trivially convergent sequence converges non-trivially. (Contributed by Scott Fenton, 20-Dec-2017.)

**Hypotheses**
Ref	Expression
ntrivcvgtail.1	⊢ 𝑍 = (ℤ_≥‘𝑀)
ntrivcvgtail.2	⊢ (𝜑 → 𝑁 ∈ 𝑍)
ntrivcvgtail.3	⊢ (𝜑 → seq𝑀( · , 𝐹) ⇝ 𝑋)
ntrivcvgtail.4	⊢ (𝜑 → 𝑋 ≠ 0)
ntrivcvgtail.5	⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → (𝐹‘𝑘) ∈ ℂ)

**Assertion**
Ref	Expression
ntrivcvgtail	⊢ (𝜑 → (( ⇝ ‘seq𝑁( · , 𝐹)) ≠ 0 ∧ seq𝑁( · , 𝐹) ⇝ ( ⇝ ‘seq𝑁( · , 𝐹))))

Distinct variable groups: 𝑘,𝐹 𝜑,𝑘 𝑘,𝑀 𝑘,𝑁 𝑘,𝑍 Allowed substitution hint: 𝑋(𝑘)

**Proof of Theorem ntrivcvgtail**
Step	Hyp	Ref	Expression
1		fclim 15501	. . . . . . . 8 ⊢ ⇝ :dom ⇝ ⟶ℂ
2		ffun 6719	. . . . . . . 8 ⊢ ( ⇝ :dom ⇝ ⟶ℂ → Fun ⇝ )
3	1, 2	ax-mp 5	. . . . . . 7 ⊢ Fun ⇝
4		ntrivcvgtail.3	. . . . . . 7 ⊢ (𝜑 → seq𝑀( · , 𝐹) ⇝ 𝑋)
5		funbrfv 6941	. . . . . . 7 ⊢ (Fun ⇝ → (seq𝑀( · , 𝐹) ⇝ 𝑋 → ( ⇝ ‘seq𝑀( · , 𝐹)) = 𝑋))
6	3, 4, 5	mpsyl 68	. . . . . 6 ⊢ (𝜑 → ( ⇝ ‘seq𝑀( · , 𝐹)) = 𝑋)
7		ntrivcvgtail.4	. . . . . 6 ⊢ (𝜑 → 𝑋 ≠ 0)
8	6, 7	eqnetrd 3006	. . . . 5 ⊢ (𝜑 → ( ⇝ ‘seq𝑀( · , 𝐹)) ≠ 0)
9	4, 6	breqtrrd 5175	. . . . 5 ⊢ (𝜑 → seq𝑀( · , 𝐹) ⇝ ( ⇝ ‘seq𝑀( · , 𝐹)))
10	8, 9	jca 510	. . . 4 ⊢ (𝜑 → (( ⇝ ‘seq𝑀( · , 𝐹)) ≠ 0 ∧ seq𝑀( · , 𝐹) ⇝ ( ⇝ ‘seq𝑀( · , 𝐹))))
11	10	adantr 479	. . 3 ⊢ ((𝜑 ∧ 𝑁 = 𝑀) → (( ⇝ ‘seq𝑀( · , 𝐹)) ≠ 0 ∧ seq𝑀( · , 𝐹) ⇝ ( ⇝ ‘seq𝑀( · , 𝐹))))
12		seqeq1 13973	. . . . . . 7 ⊢ (𝑁 = 𝑀 → seq𝑁( · , 𝐹) = seq𝑀( · , 𝐹))
13	12	fveq2d 6894	. . . . . 6 ⊢ (𝑁 = 𝑀 → ( ⇝ ‘seq𝑁( · , 𝐹)) = ( ⇝ ‘seq𝑀( · , 𝐹)))
14	13	neeq1d 2998	. . . . 5 ⊢ (𝑁 = 𝑀 → (( ⇝ ‘seq𝑁( · , 𝐹)) ≠ 0 ↔ ( ⇝ ‘seq𝑀( · , 𝐹)) ≠ 0))
15	12, 13	breq12d 5160	. . . . 5 ⊢ (𝑁 = 𝑀 → (seq𝑁( · , 𝐹) ⇝ ( ⇝ ‘seq𝑁( · , 𝐹)) ↔ seq𝑀( · , 𝐹) ⇝ ( ⇝ ‘seq𝑀( · , 𝐹))))
16	14, 15	anbi12d 629	. . . 4 ⊢ (𝑁 = 𝑀 → ((( ⇝ ‘seq𝑁( · , 𝐹)) ≠ 0 ∧ seq𝑁( · , 𝐹) ⇝ ( ⇝ ‘seq𝑁( · , 𝐹))) ↔ (( ⇝ ‘seq𝑀( · , 𝐹)) ≠ 0 ∧ seq𝑀( · , 𝐹) ⇝ ( ⇝ ‘seq𝑀( · , 𝐹)))))
17	16	adantl 480	. . 3 ⊢ ((𝜑 ∧ 𝑁 = 𝑀) → ((( ⇝ ‘seq𝑁( · , 𝐹)) ≠ 0 ∧ seq𝑁( · , 𝐹) ⇝ ( ⇝ ‘seq𝑁( · , 𝐹))) ↔ (( ⇝ ‘seq𝑀( · , 𝐹)) ≠ 0 ∧ seq𝑀( · , 𝐹) ⇝ ( ⇝ ‘seq𝑀( · , 𝐹)))))
18	11, 17	mpbird 256	. 2 ⊢ ((𝜑 ∧ 𝑁 = 𝑀) → (( ⇝ ‘seq𝑁( · , 𝐹)) ≠ 0 ∧ seq𝑁( · , 𝐹) ⇝ ( ⇝ ‘seq𝑁( · , 𝐹))))
19		ntrivcvgtail.1	. . . . . 6 ⊢ 𝑍 = (ℤ_≥‘𝑀)
20		simpr 483	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → (𝑁 − 1) ∈ (ℤ_≥‘𝑀))
21	20, 19	eleqtrrdi 2842	. . . . . 6 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → (𝑁 − 1) ∈ 𝑍)
22		ntrivcvgtail.5	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → (𝐹‘𝑘) ∈ ℂ)
23	22	adantlr 711	. . . . . 6 ⊢ (((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) ∧ 𝑘 ∈ 𝑍) → (𝐹‘𝑘) ∈ ℂ)
24	4	adantr 479	. . . . . 6 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → seq𝑀( · , 𝐹) ⇝ 𝑋)
25	7	adantr 479	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → 𝑋 ≠ 0)
26	19, 21, 24, 25, 23	ntrivcvgfvn0 15849	. . . . . 6 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → (seq𝑀( · , 𝐹)‘(𝑁 − 1)) ≠ 0)
27	19, 21, 23, 24, 26	clim2div 15839	. . . . 5 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → seq((𝑁 − 1) + 1)( · , 𝐹) ⇝ (𝑋 / (seq𝑀( · , 𝐹)‘(𝑁 − 1))))
28		funbrfv 6941	. . . . 5 ⊢ (Fun ⇝ → (seq((𝑁 − 1) + 1)( · , 𝐹) ⇝ (𝑋 / (seq𝑀( · , 𝐹)‘(𝑁 − 1))) → ( ⇝ ‘seq((𝑁 − 1) + 1)( · , 𝐹)) = (𝑋 / (seq𝑀( · , 𝐹)‘(𝑁 − 1)))))
29	3, 27, 28	mpsyl 68	. . . 4 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → ( ⇝ ‘seq((𝑁 − 1) + 1)( · , 𝐹)) = (𝑋 / (seq𝑀( · , 𝐹)‘(𝑁 − 1))))
30		climcl 15447	. . . . . . 7 ⊢ (seq𝑀( · , 𝐹) ⇝ 𝑋 → 𝑋 ∈ ℂ)
31	4, 30	syl 17	. . . . . 6 ⊢ (𝜑 → 𝑋 ∈ ℂ)
32	31	adantr 479	. . . . 5 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → 𝑋 ∈ ℂ)
33		ntrivcvgtail.2	. . . . . . . . 9 ⊢ (𝜑 → 𝑁 ∈ 𝑍)
34		eluzel2 12831	. . . . . . . . . 10 ⊢ (𝑁 ∈ (ℤ_≥‘𝑀) → 𝑀 ∈ ℤ)
35	34, 19	eleq2s 2849	. . . . . . . . 9 ⊢ (𝑁 ∈ 𝑍 → 𝑀 ∈ ℤ)
36	33, 35	syl 17	. . . . . . . 8 ⊢ (𝜑 → 𝑀 ∈ ℤ)
37	19, 36, 22	prodf 15837	. . . . . . 7 ⊢ (𝜑 → seq𝑀( · , 𝐹):𝑍⟶ℂ)
38	19	feq2i 6708	. . . . . . 7 ⊢ (seq𝑀( · , 𝐹):𝑍⟶ℂ ↔ seq𝑀( · , 𝐹):(ℤ_≥‘𝑀)⟶ℂ)
39	37, 38	sylib 217	. . . . . 6 ⊢ (𝜑 → seq𝑀( · , 𝐹):(ℤ_≥‘𝑀)⟶ℂ)
40	39	ffvelcdmda 7085	. . . . 5 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → (seq𝑀( · , 𝐹)‘(𝑁 − 1)) ∈ ℂ)
41	32, 40, 25, 26	divne0d 12010	. . . 4 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → (𝑋 / (seq𝑀( · , 𝐹)‘(𝑁 − 1))) ≠ 0)
42	29, 41	eqnetrd 3006	. . 3 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → ( ⇝ ‘seq((𝑁 − 1) + 1)( · , 𝐹)) ≠ 0)
43	27, 29	breqtrrd 5175	. . 3 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → seq((𝑁 − 1) + 1)( · , 𝐹) ⇝ ( ⇝ ‘seq((𝑁 − 1) + 1)( · , 𝐹)))
44		uzssz 12847	. . . . . . . . . . . 12 ⊢ (ℤ_≥‘𝑀) ⊆ ℤ
45	19, 44	eqsstri 4015	. . . . . . . . . . 11 ⊢ 𝑍 ⊆ ℤ
46	45, 33	sselid 3979	. . . . . . . . . 10 ⊢ (𝜑 → 𝑁 ∈ ℤ)
47	46	zcnd 12671	. . . . . . . . 9 ⊢ (𝜑 → 𝑁 ∈ ℂ)
48	47	adantr 479	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → 𝑁 ∈ ℂ)
49		1cnd 11213	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → 1 ∈ ℂ)
50	48, 49	npcand 11579	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → ((𝑁 − 1) + 1) = 𝑁)
51	50	seqeq1d 13976	. . . . . 6 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → seq((𝑁 − 1) + 1)( · , 𝐹) = seq𝑁( · , 𝐹))
52	51	fveq2d 6894	. . . . 5 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → ( ⇝ ‘seq((𝑁 − 1) + 1)( · , 𝐹)) = ( ⇝ ‘seq𝑁( · , 𝐹)))
53	52	neeq1d 2998	. . . 4 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → (( ⇝ ‘seq((𝑁 − 1) + 1)( · , 𝐹)) ≠ 0 ↔ ( ⇝ ‘seq𝑁( · , 𝐹)) ≠ 0))
54	51, 52	breq12d 5160	. . . 4 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → (seq((𝑁 − 1) + 1)( · , 𝐹) ⇝ ( ⇝ ‘seq((𝑁 − 1) + 1)( · , 𝐹)) ↔ seq𝑁( · , 𝐹) ⇝ ( ⇝ ‘seq𝑁( · , 𝐹))))
55	53, 54	anbi12d 629	. . 3 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → ((( ⇝ ‘seq((𝑁 − 1) + 1)( · , 𝐹)) ≠ 0 ∧ seq((𝑁 − 1) + 1)( · , 𝐹) ⇝ ( ⇝ ‘seq((𝑁 − 1) + 1)( · , 𝐹))) ↔ (( ⇝ ‘seq𝑁( · , 𝐹)) ≠ 0 ∧ seq𝑁( · , 𝐹) ⇝ ( ⇝ ‘seq𝑁( · , 𝐹)))))
56	42, 43, 55	mpbi2and 708	. 2 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → (( ⇝ ‘seq𝑁( · , 𝐹)) ≠ 0 ∧ seq𝑁( · , 𝐹) ⇝ ( ⇝ ‘seq𝑁( · , 𝐹))))
57	33, 19	eleqtrdi 2841	. . 3 ⊢ (𝜑 → 𝑁 ∈ (ℤ_≥‘𝑀))
58		uzm1 12864	. . 3 ⊢ (𝑁 ∈ (ℤ_≥‘𝑀) → (𝑁 = 𝑀 ∨ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)))
59	57, 58	syl 17	. 2 ⊢ (𝜑 → (𝑁 = 𝑀 ∨ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)))
60	18, 56, 59	mpjaodan 955	1 ⊢ (𝜑 → (( ⇝ ‘seq𝑁( · , 𝐹)) ≠ 0 ∧ seq𝑁( · , 𝐹) ⇝ ( ⇝ ‘seq𝑁( · , 𝐹))))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 394 ∨ wo 843 = wceq 1539 ∈ wcel 2104 ≠ wne 2938 class class class wbr 5147 dom cdm 5675 Fun wfun 6536 ⟶wf 6538 ‘cfv 6542 (class class class)co 7411 ℂcc 11110 0cc0 11112 1c1 11113 + caddc 11115 · cmul 11117 − cmin 11448 / cdiv 11875 ℤcz 12562 ℤ_≥cuz 12826 seqcseq 13970 ⇝ cli 15432

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1911 ax-6 1969 ax-7 2009 ax-8 2106 ax-9 2114 ax-10 2135 ax-11 2152 ax-12 2169 ax-ext 2701 ax-rep 5284 ax-sep 5298 ax-nul 5305 ax-pow 5362 ax-pr 5426 ax-un 7727 ax-inf2 9638 ax-cnex 11168 ax-resscn 11169 ax-1cn 11170 ax-icn 11171 ax-addcl 11172 ax-addrcl 11173 ax-mulcl 11174 ax-mulrcl 11175 ax-mulcom 11176 ax-addass 11177 ax-mulass 11178 ax-distr 11179 ax-i2m1 11180 ax-1ne0 11181 ax-1rid 11182 ax-rnegex 11183 ax-rrecex 11184 ax-cnre 11185 ax-pre-lttri 11186 ax-pre-lttrn 11187 ax-pre-ltadd 11188 ax-pre-mulgt0 11189 ax-pre-sup 11190

This theorem depends on definitions: df-bi 206 df-an 395 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2532 df-eu 2561 df-clab 2708 df-cleq 2722 df-clel 2808 df-nfc 2883 df-ne 2939 df-nel 3045 df-ral 3060 df-rex 3069 df-rmo 3374 df-reu 3375 df-rab 3431 df-v 3474 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4322 df-if 4528 df-pw 4603 df-sn 4628 df-pr 4630 df-op 4634 df-uni 4908 df-iun 4998 df-br 5148 df-opab 5210 df-mpt 5231 df-tr 5265 df-id 5573 df-eprel 5579 df-po 5587 df-so 5588 df-fr 5630 df-we 5632 df-xp 5681 df-rel 5682 df-cnv 5683 df-co 5684 df-dm 5685 df-rn 5686 df-res 5687 df-ima 5688 df-pred 6299 df-ord 6366 df-on 6367 df-lim 6368 df-suc 6369 df-iota 6494 df-fun 6544 df-fn 6545 df-f 6546 df-f1 6547 df-fo 6548 df-f1o 6549 df-fv 6550 df-riota 7367 df-ov 7414 df-oprab 7415 df-mpo 7416 df-om 7858 df-1st 7977 df-2nd 7978 df-frecs 8268 df-wrecs 8299 df-recs 8373 df-rdg 8412 df-er 8705 df-en 8942 df-dom 8943 df-sdom 8944 df-sup 9439 df-pnf 11254 df-mnf 11255 df-xr 11256 df-ltxr 11257 df-le 11258 df-sub 11450 df-neg 11451 df-div 11876 df-nn 12217 df-2 12279 df-3 12280 df-n0 12477 df-z 12563 df-uz 12827 df-rp 12979 df-fz 13489 df-seq 13971 df-exp 14032 df-cj 15050 df-re 15051 df-im 15052 df-sqrt 15186 df-abs 15187 df-clim 15436

This theorem is referenced by: ntrivcvgmullem 15851

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