MPE Home Metamath Proof Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >  ntrivcvgfvn0 Structured version   Visualization version   GIF version

Theorem ntrivcvgfvn0 14675
Description: Any value of a product sequence that converges to a nonzero value is itself nonzero. (Contributed by Scott Fenton, 20-Dec-2017.)
Hypotheses
Ref Expression
ntrivcvgfvn0.1 𝑍 = (ℤ𝑀)
ntrivcvgfvn0.2 (𝜑𝑁𝑍)
ntrivcvgfvn0.3 (𝜑 → seq𝑀( · , 𝐹) ⇝ 𝑋)
ntrivcvgfvn0.4 (𝜑𝑋 ≠ 0)
ntrivcvgfvn0.5 ((𝜑𝑘𝑍) → (𝐹𝑘) ∈ ℂ)
Assertion
Ref Expression
ntrivcvgfvn0 (𝜑 → (seq𝑀( · , 𝐹)‘𝑁) ≠ 0)
Distinct variable groups:   𝑘,𝐹   𝜑,𝑘   𝑘,𝑀   𝑘,𝑁   𝑘,𝑍
Allowed substitution hint:   𝑋(𝑘)

Proof of Theorem ntrivcvgfvn0
Dummy variables 𝑚 𝑛 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 ntrivcvgfvn0.4 . 2 (𝜑𝑋 ≠ 0)
2 fclim 14328 . . . . . . . 8 ⇝ :dom ⇝ ⟶ℂ
3 ffun 6086 . . . . . . . 8 ( ⇝ :dom ⇝ ⟶ℂ → Fun ⇝ )
42, 3ax-mp 5 . . . . . . 7 Fun ⇝
5 ntrivcvgfvn0.3 . . . . . . 7 (𝜑 → seq𝑀( · , 𝐹) ⇝ 𝑋)
6 funbrfv 6272 . . . . . . 7 (Fun ⇝ → (seq𝑀( · , 𝐹) ⇝ 𝑋 → ( ⇝ ‘seq𝑀( · , 𝐹)) = 𝑋))
74, 5, 6mpsyl 68 . . . . . 6 (𝜑 → ( ⇝ ‘seq𝑀( · , 𝐹)) = 𝑋)
87adantr 480 . . . . 5 ((𝜑 ∧ (seq𝑀( · , 𝐹)‘𝑁) = 0) → ( ⇝ ‘seq𝑀( · , 𝐹)) = 𝑋)
9 eqid 2651 . . . . . . 7 (ℤ𝑁) = (ℤ𝑁)
10 ntrivcvgfvn0.1 . . . . . . . . . 10 𝑍 = (ℤ𝑀)
11 uzssz 11745 . . . . . . . . . 10 (ℤ𝑀) ⊆ ℤ
1210, 11eqsstri 3668 . . . . . . . . 9 𝑍 ⊆ ℤ
13 ntrivcvgfvn0.2 . . . . . . . . 9 (𝜑𝑁𝑍)
1412, 13sseldi 3634 . . . . . . . 8 (𝜑𝑁 ∈ ℤ)
1514adantr 480 . . . . . . 7 ((𝜑 ∧ (seq𝑀( · , 𝐹)‘𝑁) = 0) → 𝑁 ∈ ℤ)
16 seqex 12843 . . . . . . . 8 seq𝑀( · , 𝐹) ∈ V
1716a1i 11 . . . . . . 7 ((𝜑 ∧ (seq𝑀( · , 𝐹)‘𝑁) = 0) → seq𝑀( · , 𝐹) ∈ V)
18 0cnd 10071 . . . . . . 7 ((𝜑 ∧ (seq𝑀( · , 𝐹)‘𝑁) = 0) → 0 ∈ ℂ)
19 fveq2 6229 . . . . . . . . . . 11 (𝑚 = 𝑁 → (seq𝑀( · , 𝐹)‘𝑚) = (seq𝑀( · , 𝐹)‘𝑁))
2019eqeq1d 2653 . . . . . . . . . 10 (𝑚 = 𝑁 → ((seq𝑀( · , 𝐹)‘𝑚) = 0 ↔ (seq𝑀( · , 𝐹)‘𝑁) = 0))
2120imbi2d 329 . . . . . . . . 9 (𝑚 = 𝑁 → (((𝜑 ∧ (seq𝑀( · , 𝐹)‘𝑁) = 0) → (seq𝑀( · , 𝐹)‘𝑚) = 0) ↔ ((𝜑 ∧ (seq𝑀( · , 𝐹)‘𝑁) = 0) → (seq𝑀( · , 𝐹)‘𝑁) = 0)))
22 fveq2 6229 . . . . . . . . . . 11 (𝑚 = 𝑛 → (seq𝑀( · , 𝐹)‘𝑚) = (seq𝑀( · , 𝐹)‘𝑛))
2322eqeq1d 2653 . . . . . . . . . 10 (𝑚 = 𝑛 → ((seq𝑀( · , 𝐹)‘𝑚) = 0 ↔ (seq𝑀( · , 𝐹)‘𝑛) = 0))
2423imbi2d 329 . . . . . . . . 9 (𝑚 = 𝑛 → (((𝜑 ∧ (seq𝑀( · , 𝐹)‘𝑁) = 0) → (seq𝑀( · , 𝐹)‘𝑚) = 0) ↔ ((𝜑 ∧ (seq𝑀( · , 𝐹)‘𝑁) = 0) → (seq𝑀( · , 𝐹)‘𝑛) = 0)))
25 fveq2 6229 . . . . . . . . . . 11 (𝑚 = (𝑛 + 1) → (seq𝑀( · , 𝐹)‘𝑚) = (seq𝑀( · , 𝐹)‘(𝑛 + 1)))
2625eqeq1d 2653 . . . . . . . . . 10 (𝑚 = (𝑛 + 1) → ((seq𝑀( · , 𝐹)‘𝑚) = 0 ↔ (seq𝑀( · , 𝐹)‘(𝑛 + 1)) = 0))
2726imbi2d 329 . . . . . . . . 9 (𝑚 = (𝑛 + 1) → (((𝜑 ∧ (seq𝑀( · , 𝐹)‘𝑁) = 0) → (seq𝑀( · , 𝐹)‘𝑚) = 0) ↔ ((𝜑 ∧ (seq𝑀( · , 𝐹)‘𝑁) = 0) → (seq𝑀( · , 𝐹)‘(𝑛 + 1)) = 0)))
28 fveq2 6229 . . . . . . . . . . 11 (𝑚 = 𝑘 → (seq𝑀( · , 𝐹)‘𝑚) = (seq𝑀( · , 𝐹)‘𝑘))
2928eqeq1d 2653 . . . . . . . . . 10 (𝑚 = 𝑘 → ((seq𝑀( · , 𝐹)‘𝑚) = 0 ↔ (seq𝑀( · , 𝐹)‘𝑘) = 0))
3029imbi2d 329 . . . . . . . . 9 (𝑚 = 𝑘 → (((𝜑 ∧ (seq𝑀( · , 𝐹)‘𝑁) = 0) → (seq𝑀( · , 𝐹)‘𝑚) = 0) ↔ ((𝜑 ∧ (seq𝑀( · , 𝐹)‘𝑁) = 0) → (seq𝑀( · , 𝐹)‘𝑘) = 0)))
31 simpr 476 . . . . . . . . . 10 ((𝜑 ∧ (seq𝑀( · , 𝐹)‘𝑁) = 0) → (seq𝑀( · , 𝐹)‘𝑁) = 0)
3231a1i 11 . . . . . . . . 9 (𝑁 ∈ ℤ → ((𝜑 ∧ (seq𝑀( · , 𝐹)‘𝑁) = 0) → (seq𝑀( · , 𝐹)‘𝑁) = 0))
3313, 10syl6eleq 2740 . . . . . . . . . . . . . . . 16 (𝜑𝑁 ∈ (ℤ𝑀))
34 uztrn 11742 . . . . . . . . . . . . . . . 16 ((𝑛 ∈ (ℤ𝑁) ∧ 𝑁 ∈ (ℤ𝑀)) → 𝑛 ∈ (ℤ𝑀))
3533, 34sylan2 490 . . . . . . . . . . . . . . 15 ((𝑛 ∈ (ℤ𝑁) ∧ 𝜑) → 𝑛 ∈ (ℤ𝑀))
36353adant3 1101 . . . . . . . . . . . . . 14 ((𝑛 ∈ (ℤ𝑁) ∧ 𝜑 ∧ (seq𝑀( · , 𝐹)‘𝑛) = 0) → 𝑛 ∈ (ℤ𝑀))
37 seqp1 12856 . . . . . . . . . . . . . 14 (𝑛 ∈ (ℤ𝑀) → (seq𝑀( · , 𝐹)‘(𝑛 + 1)) = ((seq𝑀( · , 𝐹)‘𝑛) · (𝐹‘(𝑛 + 1))))
3836, 37syl 17 . . . . . . . . . . . . 13 ((𝑛 ∈ (ℤ𝑁) ∧ 𝜑 ∧ (seq𝑀( · , 𝐹)‘𝑛) = 0) → (seq𝑀( · , 𝐹)‘(𝑛 + 1)) = ((seq𝑀( · , 𝐹)‘𝑛) · (𝐹‘(𝑛 + 1))))
39 oveq1 6697 . . . . . . . . . . . . . 14 ((seq𝑀( · , 𝐹)‘𝑛) = 0 → ((seq𝑀( · , 𝐹)‘𝑛) · (𝐹‘(𝑛 + 1))) = (0 · (𝐹‘(𝑛 + 1))))
40393ad2ant3 1104 . . . . . . . . . . . . 13 ((𝑛 ∈ (ℤ𝑁) ∧ 𝜑 ∧ (seq𝑀( · , 𝐹)‘𝑛) = 0) → ((seq𝑀( · , 𝐹)‘𝑛) · (𝐹‘(𝑛 + 1))) = (0 · (𝐹‘(𝑛 + 1))))
41 peano2uz 11779 . . . . . . . . . . . . . . . . . 18 (𝑛 ∈ (ℤ𝑁) → (𝑛 + 1) ∈ (ℤ𝑁))
4210uztrn2 11743 . . . . . . . . . . . . . . . . . 18 ((𝑁𝑍 ∧ (𝑛 + 1) ∈ (ℤ𝑁)) → (𝑛 + 1) ∈ 𝑍)
4313, 41, 42syl2an 493 . . . . . . . . . . . . . . . . 17 ((𝜑𝑛 ∈ (ℤ𝑁)) → (𝑛 + 1) ∈ 𝑍)
44 ntrivcvgfvn0.5 . . . . . . . . . . . . . . . . . . 19 ((𝜑𝑘𝑍) → (𝐹𝑘) ∈ ℂ)
4544ralrimiva 2995 . . . . . . . . . . . . . . . . . 18 (𝜑 → ∀𝑘𝑍 (𝐹𝑘) ∈ ℂ)
46 fveq2 6229 . . . . . . . . . . . . . . . . . . . 20 (𝑘 = (𝑛 + 1) → (𝐹𝑘) = (𝐹‘(𝑛 + 1)))
4746eleq1d 2715 . . . . . . . . . . . . . . . . . . 19 (𝑘 = (𝑛 + 1) → ((𝐹𝑘) ∈ ℂ ↔ (𝐹‘(𝑛 + 1)) ∈ ℂ))
4847rspcv 3336 . . . . . . . . . . . . . . . . . 18 ((𝑛 + 1) ∈ 𝑍 → (∀𝑘𝑍 (𝐹𝑘) ∈ ℂ → (𝐹‘(𝑛 + 1)) ∈ ℂ))
4945, 48mpan9 485 . . . . . . . . . . . . . . . . 17 ((𝜑 ∧ (𝑛 + 1) ∈ 𝑍) → (𝐹‘(𝑛 + 1)) ∈ ℂ)
5043, 49syldan 486 . . . . . . . . . . . . . . . 16 ((𝜑𝑛 ∈ (ℤ𝑁)) → (𝐹‘(𝑛 + 1)) ∈ ℂ)
5150ancoms 468 . . . . . . . . . . . . . . 15 ((𝑛 ∈ (ℤ𝑁) ∧ 𝜑) → (𝐹‘(𝑛 + 1)) ∈ ℂ)
5251mul02d 10272 . . . . . . . . . . . . . 14 ((𝑛 ∈ (ℤ𝑁) ∧ 𝜑) → (0 · (𝐹‘(𝑛 + 1))) = 0)
53523adant3 1101 . . . . . . . . . . . . 13 ((𝑛 ∈ (ℤ𝑁) ∧ 𝜑 ∧ (seq𝑀( · , 𝐹)‘𝑛) = 0) → (0 · (𝐹‘(𝑛 + 1))) = 0)
5438, 40, 533eqtrd 2689 . . . . . . . . . . . 12 ((𝑛 ∈ (ℤ𝑁) ∧ 𝜑 ∧ (seq𝑀( · , 𝐹)‘𝑛) = 0) → (seq𝑀( · , 𝐹)‘(𝑛 + 1)) = 0)
55543exp 1283 . . . . . . . . . . 11 (𝑛 ∈ (ℤ𝑁) → (𝜑 → ((seq𝑀( · , 𝐹)‘𝑛) = 0 → (seq𝑀( · , 𝐹)‘(𝑛 + 1)) = 0)))
5655adantrd 483 . . . . . . . . . 10 (𝑛 ∈ (ℤ𝑁) → ((𝜑 ∧ (seq𝑀( · , 𝐹)‘𝑁) = 0) → ((seq𝑀( · , 𝐹)‘𝑛) = 0 → (seq𝑀( · , 𝐹)‘(𝑛 + 1)) = 0)))
5756a2d 29 . . . . . . . . 9 (𝑛 ∈ (ℤ𝑁) → (((𝜑 ∧ (seq𝑀( · , 𝐹)‘𝑁) = 0) → (seq𝑀( · , 𝐹)‘𝑛) = 0) → ((𝜑 ∧ (seq𝑀( · , 𝐹)‘𝑁) = 0) → (seq𝑀( · , 𝐹)‘(𝑛 + 1)) = 0)))
5821, 24, 27, 30, 32, 57uzind4 11784 . . . . . . . 8 (𝑘 ∈ (ℤ𝑁) → ((𝜑 ∧ (seq𝑀( · , 𝐹)‘𝑁) = 0) → (seq𝑀( · , 𝐹)‘𝑘) = 0))
5958impcom 445 . . . . . . 7 (((𝜑 ∧ (seq𝑀( · , 𝐹)‘𝑁) = 0) ∧ 𝑘 ∈ (ℤ𝑁)) → (seq𝑀( · , 𝐹)‘𝑘) = 0)
609, 15, 17, 18, 59climconst 14318 . . . . . 6 ((𝜑 ∧ (seq𝑀( · , 𝐹)‘𝑁) = 0) → seq𝑀( · , 𝐹) ⇝ 0)
61 funbrfv 6272 . . . . . 6 (Fun ⇝ → (seq𝑀( · , 𝐹) ⇝ 0 → ( ⇝ ‘seq𝑀( · , 𝐹)) = 0))
624, 60, 61mpsyl 68 . . . . 5 ((𝜑 ∧ (seq𝑀( · , 𝐹)‘𝑁) = 0) → ( ⇝ ‘seq𝑀( · , 𝐹)) = 0)
638, 62eqtr3d 2687 . . . 4 ((𝜑 ∧ (seq𝑀( · , 𝐹)‘𝑁) = 0) → 𝑋 = 0)
6463ex 449 . . 3 (𝜑 → ((seq𝑀( · , 𝐹)‘𝑁) = 0 → 𝑋 = 0))
6564necon3d 2844 . 2 (𝜑 → (𝑋 ≠ 0 → (seq𝑀( · , 𝐹)‘𝑁) ≠ 0))
661, 65mpd 15 1 (𝜑 → (seq𝑀( · , 𝐹)‘𝑁) ≠ 0)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 383  w3a 1054   = wceq 1523  wcel 2030  wne 2823  wral 2941  Vcvv 3231   class class class wbr 4685  dom cdm 5143  Fun wfun 5920  wf 5922  cfv 5926  (class class class)co 6690  cc 9972  0cc0 9974  1c1 9975   + caddc 9977   · cmul 9979  cz 11415  cuz 11725  seqcseq 12841  cli 14259
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-8 2032  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-rep 4804  ax-sep 4814  ax-nul 4822  ax-pow 4873  ax-pr 4936  ax-un 6991  ax-inf2 8576  ax-cnex 10030  ax-resscn 10031  ax-1cn 10032  ax-icn 10033  ax-addcl 10034  ax-addrcl 10035  ax-mulcl 10036  ax-mulrcl 10037  ax-mulcom 10038  ax-addass 10039  ax-mulass 10040  ax-distr 10041  ax-i2m1 10042  ax-1ne0 10043  ax-1rid 10044  ax-rnegex 10045  ax-rrecex 10046  ax-cnre 10047  ax-pre-lttri 10048  ax-pre-lttrn 10049  ax-pre-ltadd 10050  ax-pre-mulgt0 10051  ax-pre-sup 10052
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3or 1055  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ne 2824  df-nel 2927  df-ral 2946  df-rex 2947  df-reu 2948  df-rmo 2949  df-rab 2950  df-v 3233  df-sbc 3469  df-csb 3567  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-pss 3623  df-nul 3949  df-if 4120  df-pw 4193  df-sn 4211  df-pr 4213  df-tp 4215  df-op 4217  df-uni 4469  df-iun 4554  df-br 4686  df-opab 4746  df-mpt 4763  df-tr 4786  df-id 5053  df-eprel 5058  df-po 5064  df-so 5065  df-fr 5102  df-we 5104  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-rn 5154  df-res 5155  df-ima 5156  df-pred 5718  df-ord 5764  df-on 5765  df-lim 5766  df-suc 5767  df-iota 5889  df-fun 5928  df-fn 5929  df-f 5930  df-f1 5931  df-fo 5932  df-f1o 5933  df-fv 5934  df-riota 6651  df-ov 6693  df-oprab 6694  df-mpt2 6695  df-om 7108  df-2nd 7211  df-wrecs 7452  df-recs 7513  df-rdg 7551  df-er 7787  df-en 7998  df-dom 7999  df-sdom 8000  df-sup 8389  df-pnf 10114  df-mnf 10115  df-xr 10116  df-ltxr 10117  df-le 10118  df-sub 10306  df-neg 10307  df-div 10723  df-nn 11059  df-2 11117  df-3 11118  df-n0 11331  df-z 11416  df-uz 11726  df-rp 11871  df-seq 12842  df-exp 12901  df-cj 13883  df-re 13884  df-im 13885  df-sqrt 14019  df-abs 14020  df-clim 14263
This theorem is referenced by:  ntrivcvgtail  14676
  Copyright terms: Public domain W3C validator