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Theorem ntrivcvgap 11555

Description: A non-trivially converging infinite product converges. (Contributed by Scott Fenton, 18-Dec-2017.)

**Hypotheses**
Ref	Expression
ntrivcvg.1	⊢ 𝑍 = (ℤ_≥‘𝑀)
ntrivcvgap.2	⊢ (𝜑 → ∃𝑛 ∈ 𝑍 ∃𝑦(𝑦 # 0 ∧ seq𝑛( · , 𝐹) ⇝ 𝑦))
ntrivcvg.3	⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → (𝐹‘𝑘) ∈ ℂ)

**Assertion**
Ref	Expression
ntrivcvgap	⊢ (𝜑 → seq𝑀( · , 𝐹) ∈ dom ⇝ )

Distinct variable groups: 𝑘,𝐹,𝑛,𝑦 𝑘,𝑀,𝑛,𝑦 𝑘,𝑍,𝑦 𝜑,𝑘,𝑛,𝑦 Allowed substitution hint: 𝑍(𝑛)

**Proof of Theorem ntrivcvgap**
Step	Hyp	Ref	Expression
1		ntrivcvgap.2	. 2 ⊢ (𝜑 → ∃𝑛 ∈ 𝑍 ∃𝑦(𝑦 # 0 ∧ seq𝑛( · , 𝐹) ⇝ 𝑦))
2		uzm1 9557	. . . . . . . . 9 ⊢ (𝑛 ∈ (ℤ_≥‘𝑀) → (𝑛 = 𝑀 ∨ (𝑛 − 1) ∈ (ℤ_≥‘𝑀)))
3		ntrivcvg.1	. . . . . . . . 9 ⊢ 𝑍 = (ℤ_≥‘𝑀)
4	2, 3	eleq2s 2272	. . . . . . . 8 ⊢ (𝑛 ∈ 𝑍 → (𝑛 = 𝑀 ∨ (𝑛 − 1) ∈ (ℤ_≥‘𝑀)))
5	4	ad2antlr 489	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ seq𝑛( · , 𝐹) ⇝ 𝑦) → (𝑛 = 𝑀 ∨ (𝑛 − 1) ∈ (ℤ_≥‘𝑀)))
6		seqeq1 10447	. . . . . . . . . . 11 ⊢ (𝑛 = 𝑀 → seq𝑛( · , 𝐹) = seq𝑀( · , 𝐹))
7	6	breq1d 4013	. . . . . . . . . 10 ⊢ (𝑛 = 𝑀 → (seq𝑛( · , 𝐹) ⇝ 𝑦 ↔ seq𝑀( · , 𝐹) ⇝ 𝑦))
8		seqex 10446	. . . . . . . . . . 11 ⊢ seq𝑀( · , 𝐹) ∈ V
9		vex 2740	. . . . . . . . . . 11 ⊢ 𝑦 ∈ V
10	8, 9	breldm 4831	. . . . . . . . . 10 ⊢ (seq𝑀( · , 𝐹) ⇝ 𝑦 → seq𝑀( · , 𝐹) ∈ dom ⇝ )
11	7, 10	syl6bi 163	. . . . . . . . 9 ⊢ (𝑛 = 𝑀 → (seq𝑛( · , 𝐹) ⇝ 𝑦 → seq𝑀( · , 𝐹) ∈ dom ⇝ ))
12	11	adantld 278	. . . . . . . 8 ⊢ (𝑛 = 𝑀 → (((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ seq𝑛( · , 𝐹) ⇝ 𝑦) → seq𝑀( · , 𝐹) ∈ dom ⇝ ))
13		eluzel2 9532	. . . . . . . . . . . . . . . . 17 ⊢ (𝑛 ∈ (ℤ_≥‘𝑀) → 𝑀 ∈ ℤ)
14	13, 3	eleq2s 2272	. . . . . . . . . . . . . . . 16 ⊢ (𝑛 ∈ 𝑍 → 𝑀 ∈ ℤ)
15	14	ad3antlr 493	. . . . . . . . . . . . . . 15 ⊢ ((((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ (𝑛 − 1) ∈ 𝑍) ∧ seq𝑛( · , 𝐹) ⇝ 𝑦) → 𝑀 ∈ ℤ)
16		ntrivcvg.3	. . . . . . . . . . . . . . . 16 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → (𝐹‘𝑘) ∈ ℂ)
17	16	ad5ant15 521	. . . . . . . . . . . . . . 15 ⊢ (((((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ (𝑛 − 1) ∈ 𝑍) ∧ seq𝑛( · , 𝐹) ⇝ 𝑦) ∧ 𝑘 ∈ 𝑍) → (𝐹‘𝑘) ∈ ℂ)
18	3, 15, 17	prodf 11545	. . . . . . . . . . . . . 14 ⊢ ((((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ (𝑛 − 1) ∈ 𝑍) ∧ seq𝑛( · , 𝐹) ⇝ 𝑦) → seq𝑀( · , 𝐹):𝑍⟶ℂ)
19		simplr 528	. . . . . . . . . . . . . 14 ⊢ ((((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ (𝑛 − 1) ∈ 𝑍) ∧ seq𝑛( · , 𝐹) ⇝ 𝑦) → (𝑛 − 1) ∈ 𝑍)
20	18, 19	ffvelcdmd 5652	. . . . . . . . . . . . 13 ⊢ ((((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ (𝑛 − 1) ∈ 𝑍) ∧ seq𝑛( · , 𝐹) ⇝ 𝑦) → (seq𝑀( · , 𝐹)‘(𝑛 − 1)) ∈ ℂ)
21		climcl 11289	. . . . . . . . . . . . . 14 ⊢ (seq𝑛( · , 𝐹) ⇝ 𝑦 → 𝑦 ∈ ℂ)
22	21	adantl 277	. . . . . . . . . . . . 13 ⊢ ((((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ (𝑛 − 1) ∈ 𝑍) ∧ seq𝑛( · , 𝐹) ⇝ 𝑦) → 𝑦 ∈ ℂ)
23	20, 22	mulcld 7977	. . . . . . . . . . . 12 ⊢ ((((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ (𝑛 − 1) ∈ 𝑍) ∧ seq𝑛( · , 𝐹) ⇝ 𝑦) → ((seq𝑀( · , 𝐹)‘(𝑛 − 1)) · 𝑦) ∈ ℂ)
24		uzssz 9546	. . . . . . . . . . . . . . . . . . . 20 ⊢ (ℤ_≥‘𝑀) ⊆ ℤ
25	3, 24	eqsstri 3187	. . . . . . . . . . . . . . . . . . 19 ⊢ 𝑍 ⊆ ℤ
26		simplr 528	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ (𝑛 − 1) ∈ 𝑍) → 𝑛 ∈ 𝑍)
27	25, 26	sselid 3153	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ (𝑛 − 1) ∈ 𝑍) → 𝑛 ∈ ℤ)
28	27	zcnd 9375	. . . . . . . . . . . . . . . . 17 ⊢ (((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ (𝑛 − 1) ∈ 𝑍) → 𝑛 ∈ ℂ)
29		1cnd 7972	. . . . . . . . . . . . . . . . 17 ⊢ (((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ (𝑛 − 1) ∈ 𝑍) → 1 ∈ ℂ)
30	28, 29	npcand 8271	. . . . . . . . . . . . . . . 16 ⊢ (((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ (𝑛 − 1) ∈ 𝑍) → ((𝑛 − 1) + 1) = 𝑛)
31	30	seqeq1d 10450	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ (𝑛 − 1) ∈ 𝑍) → seq((𝑛 − 1) + 1)( · , 𝐹) = seq𝑛( · , 𝐹))
32	31	breq1d 4013	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ (𝑛 − 1) ∈ 𝑍) → (seq((𝑛 − 1) + 1)( · , 𝐹) ⇝ 𝑦 ↔ seq𝑛( · , 𝐹) ⇝ 𝑦))
33	32	biimpar 297	. . . . . . . . . . . . 13 ⊢ ((((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ (𝑛 − 1) ∈ 𝑍) ∧ seq𝑛( · , 𝐹) ⇝ 𝑦) → seq((𝑛 − 1) + 1)( · , 𝐹) ⇝ 𝑦)
34	3, 19, 17, 33	clim2prod 11546	. . . . . . . . . . . 12 ⊢ ((((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ (𝑛 − 1) ∈ 𝑍) ∧ seq𝑛( · , 𝐹) ⇝ 𝑦) → seq𝑀( · , 𝐹) ⇝ ((seq𝑀( · , 𝐹)‘(𝑛 − 1)) · 𝑦))
35		breldmg 4833	. . . . . . . . . . . 12 ⊢ ((seq𝑀( · , 𝐹) ∈ V ∧ ((seq𝑀( · , 𝐹)‘(𝑛 − 1)) · 𝑦) ∈ ℂ ∧ seq𝑀( · , 𝐹) ⇝ ((seq𝑀( · , 𝐹)‘(𝑛 − 1)) · 𝑦)) → seq𝑀( · , 𝐹) ∈ dom ⇝ )
36	8, 23, 34, 35	mp3an2i 1342	. . . . . . . . . . 11 ⊢ ((((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ (𝑛 − 1) ∈ 𝑍) ∧ seq𝑛( · , 𝐹) ⇝ 𝑦) → seq𝑀( · , 𝐹) ∈ dom ⇝ )
37	36	an32s 568	. . . . . . . . . 10 ⊢ ((((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ seq𝑛( · , 𝐹) ⇝ 𝑦) ∧ (𝑛 − 1) ∈ 𝑍) → seq𝑀( · , 𝐹) ∈ dom ⇝ )
38	37	expcom 116	. . . . . . . . 9 ⊢ ((𝑛 − 1) ∈ 𝑍 → (((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ seq𝑛( · , 𝐹) ⇝ 𝑦) → seq𝑀( · , 𝐹) ∈ dom ⇝ ))
39	3	eqcomi 2181	. . . . . . . . 9 ⊢ (ℤ_≥‘𝑀) = 𝑍
40	38, 39	eleq2s 2272	. . . . . . . 8 ⊢ ((𝑛 − 1) ∈ (ℤ_≥‘𝑀) → (((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ seq𝑛( · , 𝐹) ⇝ 𝑦) → seq𝑀( · , 𝐹) ∈ dom ⇝ ))
41	12, 40	jaoi 716	. . . . . . 7 ⊢ ((𝑛 = 𝑀 ∨ (𝑛 − 1) ∈ (ℤ_≥‘𝑀)) → (((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ seq𝑛( · , 𝐹) ⇝ 𝑦) → seq𝑀( · , 𝐹) ∈ dom ⇝ ))
42	5, 41	mpcom 36	. . . . . 6 ⊢ (((𝜑 ∧ 𝑛 ∈ 𝑍) ∧ seq𝑛( · , 𝐹) ⇝ 𝑦) → seq𝑀( · , 𝐹) ∈ dom ⇝ )
43	42	ex 115	. . . . 5 ⊢ ((𝜑 ∧ 𝑛 ∈ 𝑍) → (seq𝑛( · , 𝐹) ⇝ 𝑦 → seq𝑀( · , 𝐹) ∈ dom ⇝ ))
44	43	adantld 278	. . . 4 ⊢ ((𝜑 ∧ 𝑛 ∈ 𝑍) → ((𝑦 # 0 ∧ seq𝑛( · , 𝐹) ⇝ 𝑦) → seq𝑀( · , 𝐹) ∈ dom ⇝ ))
45	44	exlimdv 1819	. . 3 ⊢ ((𝜑 ∧ 𝑛 ∈ 𝑍) → (∃𝑦(𝑦 # 0 ∧ seq𝑛( · , 𝐹) ⇝ 𝑦) → seq𝑀( · , 𝐹) ∈ dom ⇝ ))
46	45	rexlimdva 2594	. 2 ⊢ (𝜑 → (∃𝑛 ∈ 𝑍 ∃𝑦(𝑦 # 0 ∧ seq𝑛( · , 𝐹) ⇝ 𝑦) → seq𝑀( · , 𝐹) ∈ dom ⇝ ))
47	1, 46	mpd 13	1 ⊢ (𝜑 → seq𝑀( · , 𝐹) ∈ dom ⇝ )

Colors of variables: wff set class

Syntax hints: → wi 4 ∧ wa 104 ∨ wo 708 = wceq 1353 ∃wex 1492 ∈ wcel 2148 ∃wrex 2456 Vcvv 2737 class class class wbr 4003 dom cdm 4626 ‘cfv 5216 (class class class)co 5874 ℂcc 7808 0cc0 7810 1c1 7811 + caddc 7813 · cmul 7815 − cmin 8127 # cap 8537 ℤcz 9252 ℤ_≥cuz 9527 seqcseq 10444 ⇝ cli 11285

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 614 ax-in2 615 ax-io 709 ax-5 1447 ax-7 1448 ax-gen 1449 ax-ie1 1493 ax-ie2 1494 ax-8 1504 ax-10 1505 ax-11 1506 ax-i12 1507 ax-bndl 1509 ax-4 1510 ax-17 1526 ax-i9 1530 ax-ial 1534 ax-i5r 1535 ax-13 2150 ax-14 2151 ax-ext 2159 ax-coll 4118 ax-sep 4121 ax-nul 4129 ax-pow 4174 ax-pr 4209 ax-un 4433 ax-setind 4536 ax-iinf 4587 ax-cnex 7901 ax-resscn 7902 ax-1cn 7903 ax-1re 7904 ax-icn 7905 ax-addcl 7906 ax-addrcl 7907 ax-mulcl 7908 ax-mulrcl 7909 ax-addcom 7910 ax-mulcom 7911 ax-addass 7912 ax-mulass 7913 ax-distr 7914 ax-i2m1 7915 ax-0lt1 7916 ax-1rid 7917 ax-0id 7918 ax-rnegex 7919 ax-precex 7920 ax-cnre 7921 ax-pre-ltirr 7922 ax-pre-ltwlin 7923 ax-pre-lttrn 7924 ax-pre-apti 7925 ax-pre-ltadd 7926 ax-pre-mulgt0 7927 ax-pre-mulext 7928 ax-arch 7929 ax-caucvg 7930

This theorem depends on definitions: df-bi 117 df-dc 835 df-3or 979 df-3an 980 df-tru 1356 df-fal 1359 df-nf 1461 df-sb 1763 df-eu 2029 df-mo 2030 df-clab 2164 df-cleq 2170 df-clel 2173 df-nfc 2308 df-ne 2348 df-nel 2443 df-ral 2460 df-rex 2461 df-reu 2462 df-rmo 2463 df-rab 2464 df-v 2739 df-sbc 2963 df-csb 3058 df-dif 3131 df-un 3133 df-in 3135 df-ss 3142 df-nul 3423 df-if 3535 df-pw 3577 df-sn 3598 df-pr 3599 df-op 3601 df-uni 3810 df-int 3845 df-iun 3888 df-br 4004 df-opab 4065 df-mpt 4066 df-tr 4102 df-id 4293 df-po 4296 df-iso 4297 df-iord 4366 df-on 4368 df-ilim 4369 df-suc 4371 df-iom 4590 df-xp 4632 df-rel 4633 df-cnv 4634 df-co 4635 df-dm 4636 df-rn 4637 df-res 4638 df-ima 4639 df-iota 5178 df-fun 5218 df-fn 5219 df-f 5220 df-f1 5221 df-fo 5222 df-f1o 5223 df-fv 5224 df-riota 5830 df-ov 5877 df-oprab 5878 df-mpo 5879 df-1st 6140 df-2nd 6141 df-recs 6305 df-frec 6391 df-pnf 7993 df-mnf 7994 df-xr 7995 df-ltxr 7996 df-le 7997 df-sub 8129 df-neg 8130 df-reap 8531 df-ap 8538 df-div 8629 df-inn 8919 df-2 8977 df-3 8978 df-4 8979 df-n0 9176 df-z 9253 df-uz 9528 df-rp 9653 df-seqfrec 10445 df-exp 10519 df-cj 10850 df-re 10851 df-im 10852 df-rsqrt 11006 df-abs 11007 df-clim 11286

This theorem is referenced by: (None)

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