ntrivcvgtail - Metamath Proof Explorer

	Metamath Proof Explorer		< Previous Next > Nearby theorems
Mirrors > Home > MPE Home > Th. List > ntrivcvgtail		Structured version Visualization version GIF version

Theorem ntrivcvgtail 15843

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 15494	. . . . . . . 8 ⊢ ⇝ :dom ⇝ ⟶ℂ
2		ffun 6718	. . . . . . . 8 ⊢ ( ⇝ :dom ⇝ ⟶ℂ → Fun ⇝ )
3	1, 2	ax-mp 5	. . . . . . 7 ⊢ Fun ⇝
4		ntrivcvgtail.3	. . . . . . 7 ⊢ (𝜑 → seq𝑀( · , 𝐹) ⇝ 𝑋)
5		funbrfv 6940	. . . . . . 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 3009	. . . . 5 ⊢ (𝜑 → ( ⇝ ‘seq𝑀( · , 𝐹)) ≠ 0)
9	4, 6	breqtrrd 5176	. . . . 5 ⊢ (𝜑 → seq𝑀( · , 𝐹) ⇝ ( ⇝ ‘seq𝑀( · , 𝐹)))
10	8, 9	jca 513	. . . 4 ⊢ (𝜑 → (( ⇝ ‘seq𝑀( · , 𝐹)) ≠ 0 ∧ seq𝑀( · , 𝐹) ⇝ ( ⇝ ‘seq𝑀( · , 𝐹))))
11	10	adantr 482	. . 3 ⊢ ((𝜑 ∧ 𝑁 = 𝑀) → (( ⇝ ‘seq𝑀( · , 𝐹)) ≠ 0 ∧ seq𝑀( · , 𝐹) ⇝ ( ⇝ ‘seq𝑀( · , 𝐹))))
12		seqeq1 13966	. . . . . . 7 ⊢ (𝑁 = 𝑀 → seq𝑁( · , 𝐹) = seq𝑀( · , 𝐹))
13	12	fveq2d 6893	. . . . . 6 ⊢ (𝑁 = 𝑀 → ( ⇝ ‘seq𝑁( · , 𝐹)) = ( ⇝ ‘seq𝑀( · , 𝐹)))
14	13	neeq1d 3001	. . . . 5 ⊢ (𝑁 = 𝑀 → (( ⇝ ‘seq𝑁( · , 𝐹)) ≠ 0 ↔ ( ⇝ ‘seq𝑀( · , 𝐹)) ≠ 0))
15	12, 13	breq12d 5161	. . . . 5 ⊢ (𝑁 = 𝑀 → (seq𝑁( · , 𝐹) ⇝ ( ⇝ ‘seq𝑁( · , 𝐹)) ↔ seq𝑀( · , 𝐹) ⇝ ( ⇝ ‘seq𝑀( · , 𝐹))))
16	14, 15	anbi12d 632	. . . 4 ⊢ (𝑁 = 𝑀 → ((( ⇝ ‘seq𝑁( · , 𝐹)) ≠ 0 ∧ seq𝑁( · , 𝐹) ⇝ ( ⇝ ‘seq𝑁( · , 𝐹))) ↔ (( ⇝ ‘seq𝑀( · , 𝐹)) ≠ 0 ∧ seq𝑀( · , 𝐹) ⇝ ( ⇝ ‘seq𝑀( · , 𝐹)))))
17	16	adantl 483	. . 3 ⊢ ((𝜑 ∧ 𝑁 = 𝑀) → ((( ⇝ ‘seq𝑁( · , 𝐹)) ≠ 0 ∧ seq𝑁( · , 𝐹) ⇝ ( ⇝ ‘seq𝑁( · , 𝐹))) ↔ (( ⇝ ‘seq𝑀( · , 𝐹)) ≠ 0 ∧ seq𝑀( · , 𝐹) ⇝ ( ⇝ ‘seq𝑀( · , 𝐹)))))
18	11, 17	mpbird 257	. 2 ⊢ ((𝜑 ∧ 𝑁 = 𝑀) → (( ⇝ ‘seq𝑁( · , 𝐹)) ≠ 0 ∧ seq𝑁( · , 𝐹) ⇝ ( ⇝ ‘seq𝑁( · , 𝐹))))
19		ntrivcvgtail.1	. . . . . 6 ⊢ 𝑍 = (ℤ_≥‘𝑀)
20		simpr 486	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → (𝑁 − 1) ∈ (ℤ_≥‘𝑀))
21	20, 19	eleqtrrdi 2845	. . . . . 6 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → (𝑁 − 1) ∈ 𝑍)
22		ntrivcvgtail.5	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → (𝐹‘𝑘) ∈ ℂ)
23	22	adantlr 714	. . . . . 6 ⊢ (((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) ∧ 𝑘 ∈ 𝑍) → (𝐹‘𝑘) ∈ ℂ)
24	4	adantr 482	. . . . . 6 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → seq𝑀( · , 𝐹) ⇝ 𝑋)
25	7	adantr 482	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → 𝑋 ≠ 0)
26	19, 21, 24, 25, 23	ntrivcvgfvn0 15842	. . . . . 6 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → (seq𝑀( · , 𝐹)‘(𝑁 − 1)) ≠ 0)
27	19, 21, 23, 24, 26	clim2div 15832	. . . . 5 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → seq((𝑁 − 1) + 1)( · , 𝐹) ⇝ (𝑋 / (seq𝑀( · , 𝐹)‘(𝑁 − 1))))
28		funbrfv 6940	. . . . 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 15440	. . . . . . 7 ⊢ (seq𝑀( · , 𝐹) ⇝ 𝑋 → 𝑋 ∈ ℂ)
31	4, 30	syl 17	. . . . . 6 ⊢ (𝜑 → 𝑋 ∈ ℂ)
32	31	adantr 482	. . . . 5 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → 𝑋 ∈ ℂ)
33		ntrivcvgtail.2	. . . . . . . . 9 ⊢ (𝜑 → 𝑁 ∈ 𝑍)
34		eluzel2 12824	. . . . . . . . . 10 ⊢ (𝑁 ∈ (ℤ_≥‘𝑀) → 𝑀 ∈ ℤ)
35	34, 19	eleq2s 2852	. . . . . . . . 9 ⊢ (𝑁 ∈ 𝑍 → 𝑀 ∈ ℤ)
36	33, 35	syl 17	. . . . . . . 8 ⊢ (𝜑 → 𝑀 ∈ ℤ)
37	19, 36, 22	prodf 15830	. . . . . . 7 ⊢ (𝜑 → seq𝑀( · , 𝐹):𝑍⟶ℂ)
38	19	feq2i 6707	. . . . . . 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 7084	. . . . 5 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → (seq𝑀( · , 𝐹)‘(𝑁 − 1)) ∈ ℂ)
41	32, 40, 25, 26	divne0d 12003	. . . 4 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → (𝑋 / (seq𝑀( · , 𝐹)‘(𝑁 − 1))) ≠ 0)
42	29, 41	eqnetrd 3009	. . 3 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → ( ⇝ ‘seq((𝑁 − 1) + 1)( · , 𝐹)) ≠ 0)
43	27, 29	breqtrrd 5176	. . 3 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → seq((𝑁 − 1) + 1)( · , 𝐹) ⇝ ( ⇝ ‘seq((𝑁 − 1) + 1)( · , 𝐹)))
44		uzssz 12840	. . . . . . . . . . . 12 ⊢ (ℤ_≥‘𝑀) ⊆ ℤ
45	19, 44	eqsstri 4016	. . . . . . . . . . 11 ⊢ 𝑍 ⊆ ℤ
46	45, 33	sselid 3980	. . . . . . . . . 10 ⊢ (𝜑 → 𝑁 ∈ ℤ)
47	46	zcnd 12664	. . . . . . . . 9 ⊢ (𝜑 → 𝑁 ∈ ℂ)
48	47	adantr 482	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → 𝑁 ∈ ℂ)
49		1cnd 11206	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → 1 ∈ ℂ)
50	48, 49	npcand 11572	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → ((𝑁 − 1) + 1) = 𝑁)
51	50	seqeq1d 13969	. . . . . 6 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → seq((𝑁 − 1) + 1)( · , 𝐹) = seq𝑁( · , 𝐹))
52	51	fveq2d 6893	. . . . 5 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → ( ⇝ ‘seq((𝑁 − 1) + 1)( · , 𝐹)) = ( ⇝ ‘seq𝑁( · , 𝐹)))
53	52	neeq1d 3001	. . . 4 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → (( ⇝ ‘seq((𝑁 − 1) + 1)( · , 𝐹)) ≠ 0 ↔ ( ⇝ ‘seq𝑁( · , 𝐹)) ≠ 0))
54	51, 52	breq12d 5161	. . . 4 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → (seq((𝑁 − 1) + 1)( · , 𝐹) ⇝ ( ⇝ ‘seq((𝑁 − 1) + 1)( · , 𝐹)) ↔ seq𝑁( · , 𝐹) ⇝ ( ⇝ ‘seq𝑁( · , 𝐹))))
55	53, 54	anbi12d 632	. . 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 711	. 2 ⊢ ((𝜑 ∧ (𝑁 − 1) ∈ (ℤ_≥‘𝑀)) → (( ⇝ ‘seq𝑁( · , 𝐹)) ≠ 0 ∧ seq𝑁( · , 𝐹) ⇝ ( ⇝ ‘seq𝑁( · , 𝐹))))
57	33, 19	eleqtrdi 2844	. . 3 ⊢ (𝜑 → 𝑁 ∈ (ℤ_≥‘𝑀))
58		uzm1 12857	. . 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 958	1 ⊢ (𝜑 → (( ⇝ ‘seq𝑁( · , 𝐹)) ≠ 0 ∧ seq𝑁( · , 𝐹) ⇝ ( ⇝ ‘seq𝑁( · , 𝐹))))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 397 ∨ wo 846 = wceq 1542 ∈ wcel 2107 ≠ wne 2941 class class class wbr 5148 dom cdm 5676 Fun wfun 6535 ⟶wf 6537 ‘cfv 6541 (class class class)co 7406 ℂcc 11105 0cc0 11107 1c1 11108 + caddc 11110 · cmul 11112 − cmin 11441 / cdiv 11868 ℤcz 12555 ℤ_≥cuz 12819 seqcseq 13963 ⇝ cli 15425

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7722 ax-inf2 9633 ax-cnex 11163 ax-resscn 11164 ax-1cn 11165 ax-icn 11166 ax-addcl 11167 ax-addrcl 11168 ax-mulcl 11169 ax-mulrcl 11170 ax-mulcom 11171 ax-addass 11172 ax-mulass 11173 ax-distr 11174 ax-i2m1 11175 ax-1ne0 11176 ax-1rid 11177 ax-rnegex 11178 ax-rrecex 11179 ax-cnre 11180 ax-pre-lttri 11181 ax-pre-lttrn 11182 ax-pre-ltadd 11183 ax-pre-mulgt0 11184 ax-pre-sup 11185

This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2942 df-nel 3048 df-ral 3063 df-rex 3072 df-rmo 3377 df-reu 3378 df-rab 3434 df-v 3477 df-sbc 3778 df-csb 3894 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-pss 3967 df-nul 4323 df-if 4529 df-pw 4604 df-sn 4629 df-pr 4631 df-op 4635 df-uni 4909 df-iun 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5574 df-eprel 5580 df-po 5588 df-so 5589 df-fr 5631 df-we 5633 df-xp 5682 df-rel 5683 df-cnv 5684 df-co 5685 df-dm 5686 df-rn 5687 df-res 5688 df-ima 5689 df-pred 6298 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6493 df-fun 6543 df-fn 6544 df-f 6545 df-f1 6546 df-fo 6547 df-f1o 6548 df-fv 6549 df-riota 7362 df-ov 7409 df-oprab 7410 df-mpo 7411 df-om 7853 df-1st 7972 df-2nd 7973 df-frecs 8263 df-wrecs 8294 df-recs 8368 df-rdg 8407 df-er 8700 df-en 8937 df-dom 8938 df-sdom 8939 df-sup 9434 df-pnf 11247 df-mnf 11248 df-xr 11249 df-ltxr 11250 df-le 11251 df-sub 11443 df-neg 11444 df-div 11869 df-nn 12210 df-2 12272 df-3 12273 df-n0 12470 df-z 12556 df-uz 12820 df-rp 12972 df-fz 13482 df-seq 13964 df-exp 14025 df-cj 15043 df-re 15044 df-im 15045 df-sqrt 15179 df-abs 15180 df-clim 15429

This theorem is referenced by: ntrivcvgmullem 15844

W3C validator