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Theorem prodfap0 11508
Description: The product of finitely many terms apart from zero is apart from zero. (Contributed by Scott Fenton, 14-Jan-2018.) (Revised by Jim Kingdon, 23-Mar-2024.)
Hypotheses
Ref Expression
prodfap0.1 (𝜑𝑁 ∈ (ℤ𝑀))
prodfap0.2 ((𝜑𝑘 ∈ (ℤ𝑀)) → (𝐹𝑘) ∈ ℂ)
prodfap0.3 ((𝜑𝑘 ∈ (𝑀...𝑁)) → (𝐹𝑘) # 0)
Assertion
Ref Expression
prodfap0 (𝜑 → (seq𝑀( · , 𝐹)‘𝑁) # 0)
Distinct variable groups:   𝑘,𝐹   𝑘,𝑀   𝑘,𝑁   𝜑,𝑘

Proof of Theorem prodfap0
Dummy variables 𝑛 𝑣 𝑚 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 prodfap0.1 . . 3 (𝜑𝑁 ∈ (ℤ𝑀))
2 eluzfz2 9988 . . 3 (𝑁 ∈ (ℤ𝑀) → 𝑁 ∈ (𝑀...𝑁))
31, 2syl 14 . 2 (𝜑𝑁 ∈ (𝑀...𝑁))
4 fveq2 5496 . . . . 5 (𝑚 = 𝑀 → (seq𝑀( · , 𝐹)‘𝑚) = (seq𝑀( · , 𝐹)‘𝑀))
54breq1d 3999 . . . 4 (𝑚 = 𝑀 → ((seq𝑀( · , 𝐹)‘𝑚) # 0 ↔ (seq𝑀( · , 𝐹)‘𝑀) # 0))
65imbi2d 229 . . 3 (𝑚 = 𝑀 → ((𝜑 → (seq𝑀( · , 𝐹)‘𝑚) # 0) ↔ (𝜑 → (seq𝑀( · , 𝐹)‘𝑀) # 0)))
7 fveq2 5496 . . . . 5 (𝑚 = 𝑛 → (seq𝑀( · , 𝐹)‘𝑚) = (seq𝑀( · , 𝐹)‘𝑛))
87breq1d 3999 . . . 4 (𝑚 = 𝑛 → ((seq𝑀( · , 𝐹)‘𝑚) # 0 ↔ (seq𝑀( · , 𝐹)‘𝑛) # 0))
98imbi2d 229 . . 3 (𝑚 = 𝑛 → ((𝜑 → (seq𝑀( · , 𝐹)‘𝑚) # 0) ↔ (𝜑 → (seq𝑀( · , 𝐹)‘𝑛) # 0)))
10 fveq2 5496 . . . . 5 (𝑚 = (𝑛 + 1) → (seq𝑀( · , 𝐹)‘𝑚) = (seq𝑀( · , 𝐹)‘(𝑛 + 1)))
1110breq1d 3999 . . . 4 (𝑚 = (𝑛 + 1) → ((seq𝑀( · , 𝐹)‘𝑚) # 0 ↔ (seq𝑀( · , 𝐹)‘(𝑛 + 1)) # 0))
1211imbi2d 229 . . 3 (𝑚 = (𝑛 + 1) → ((𝜑 → (seq𝑀( · , 𝐹)‘𝑚) # 0) ↔ (𝜑 → (seq𝑀( · , 𝐹)‘(𝑛 + 1)) # 0)))
13 fveq2 5496 . . . . 5 (𝑚 = 𝑁 → (seq𝑀( · , 𝐹)‘𝑚) = (seq𝑀( · , 𝐹)‘𝑁))
1413breq1d 3999 . . . 4 (𝑚 = 𝑁 → ((seq𝑀( · , 𝐹)‘𝑚) # 0 ↔ (seq𝑀( · , 𝐹)‘𝑁) # 0))
1514imbi2d 229 . . 3 (𝑚 = 𝑁 → ((𝜑 → (seq𝑀( · , 𝐹)‘𝑚) # 0) ↔ (𝜑 → (seq𝑀( · , 𝐹)‘𝑁) # 0)))
16 eluzfz1 9987 . . . 4 (𝑁 ∈ (ℤ𝑀) → 𝑀 ∈ (𝑀...𝑁))
17 elfzelz 9981 . . . . . . . 8 (𝑀 ∈ (𝑀...𝑁) → 𝑀 ∈ ℤ)
1817adantl 275 . . . . . . 7 ((𝜑𝑀 ∈ (𝑀...𝑁)) → 𝑀 ∈ ℤ)
19 prodfap0.2 . . . . . . . 8 ((𝜑𝑘 ∈ (ℤ𝑀)) → (𝐹𝑘) ∈ ℂ)
2019adantlr 474 . . . . . . 7 (((𝜑𝑀 ∈ (𝑀...𝑁)) ∧ 𝑘 ∈ (ℤ𝑀)) → (𝐹𝑘) ∈ ℂ)
21 mulcl 7901 . . . . . . . 8 ((𝑘 ∈ ℂ ∧ 𝑣 ∈ ℂ) → (𝑘 · 𝑣) ∈ ℂ)
2221adantl 275 . . . . . . 7 (((𝜑𝑀 ∈ (𝑀...𝑁)) ∧ (𝑘 ∈ ℂ ∧ 𝑣 ∈ ℂ)) → (𝑘 · 𝑣) ∈ ℂ)
2318, 20, 22seq3-1 10416 . . . . . 6 ((𝜑𝑀 ∈ (𝑀...𝑁)) → (seq𝑀( · , 𝐹)‘𝑀) = (𝐹𝑀))
24 fveq2 5496 . . . . . . . . . 10 (𝑘 = 𝑀 → (𝐹𝑘) = (𝐹𝑀))
2524breq1d 3999 . . . . . . . . 9 (𝑘 = 𝑀 → ((𝐹𝑘) # 0 ↔ (𝐹𝑀) # 0))
2625imbi2d 229 . . . . . . . 8 (𝑘 = 𝑀 → ((𝜑 → (𝐹𝑘) # 0) ↔ (𝜑 → (𝐹𝑀) # 0)))
27 prodfap0.3 . . . . . . . . 9 ((𝜑𝑘 ∈ (𝑀...𝑁)) → (𝐹𝑘) # 0)
2827expcom 115 . . . . . . . 8 (𝑘 ∈ (𝑀...𝑁) → (𝜑 → (𝐹𝑘) # 0))
2926, 28vtoclga 2796 . . . . . . 7 (𝑀 ∈ (𝑀...𝑁) → (𝜑 → (𝐹𝑀) # 0))
3029impcom 124 . . . . . 6 ((𝜑𝑀 ∈ (𝑀...𝑁)) → (𝐹𝑀) # 0)
3123, 30eqbrtrd 4011 . . . . 5 ((𝜑𝑀 ∈ (𝑀...𝑁)) → (seq𝑀( · , 𝐹)‘𝑀) # 0)
3231expcom 115 . . . 4 (𝑀 ∈ (𝑀...𝑁) → (𝜑 → (seq𝑀( · , 𝐹)‘𝑀) # 0))
3316, 32syl 14 . . 3 (𝑁 ∈ (ℤ𝑀) → (𝜑 → (seq𝑀( · , 𝐹)‘𝑀) # 0))
34 elfzouz 10107 . . . . . . . . 9 (𝑛 ∈ (𝑀..^𝑁) → 𝑛 ∈ (ℤ𝑀))
35343ad2ant2 1014 . . . . . . . 8 ((𝜑𝑛 ∈ (𝑀..^𝑁) ∧ (seq𝑀( · , 𝐹)‘𝑛) # 0) → 𝑛 ∈ (ℤ𝑀))
36193ad2antl1 1154 . . . . . . . 8 (((𝜑𝑛 ∈ (𝑀..^𝑁) ∧ (seq𝑀( · , 𝐹)‘𝑛) # 0) ∧ 𝑘 ∈ (ℤ𝑀)) → (𝐹𝑘) ∈ ℂ)
3721adantl 275 . . . . . . . 8 (((𝜑𝑛 ∈ (𝑀..^𝑁) ∧ (seq𝑀( · , 𝐹)‘𝑛) # 0) ∧ (𝑘 ∈ ℂ ∧ 𝑣 ∈ ℂ)) → (𝑘 · 𝑣) ∈ ℂ)
3835, 36, 37seq3p1 10418 . . . . . . 7 ((𝜑𝑛 ∈ (𝑀..^𝑁) ∧ (seq𝑀( · , 𝐹)‘𝑛) # 0) → (seq𝑀( · , 𝐹)‘(𝑛 + 1)) = ((seq𝑀( · , 𝐹)‘𝑛) · (𝐹‘(𝑛 + 1))))
39 elfzofz 10118 . . . . . . . . . 10 (𝑛 ∈ (𝑀..^𝑁) → 𝑛 ∈ (𝑀...𝑁))
40 elfzuz 9977 . . . . . . . . . . 11 (𝑛 ∈ (𝑀...𝑁) → 𝑛 ∈ (ℤ𝑀))
41 eqid 2170 . . . . . . . . . . . . 13 (ℤ𝑀) = (ℤ𝑀)
421, 16, 173syl 17 . . . . . . . . . . . . 13 (𝜑𝑀 ∈ ℤ)
4341, 42, 19prodf 11501 . . . . . . . . . . . 12 (𝜑 → seq𝑀( · , 𝐹):(ℤ𝑀)⟶ℂ)
4443ffvelrnda 5631 . . . . . . . . . . 11 ((𝜑𝑛 ∈ (ℤ𝑀)) → (seq𝑀( · , 𝐹)‘𝑛) ∈ ℂ)
4540, 44sylan2 284 . . . . . . . . . 10 ((𝜑𝑛 ∈ (𝑀...𝑁)) → (seq𝑀( · , 𝐹)‘𝑛) ∈ ℂ)
4639, 45sylan2 284 . . . . . . . . 9 ((𝜑𝑛 ∈ (𝑀..^𝑁)) → (seq𝑀( · , 𝐹)‘𝑛) ∈ ℂ)
47463adant3 1012 . . . . . . . 8 ((𝜑𝑛 ∈ (𝑀..^𝑁) ∧ (seq𝑀( · , 𝐹)‘𝑛) # 0) → (seq𝑀( · , 𝐹)‘𝑛) ∈ ℂ)
48 fzofzp1 10183 . . . . . . . . . . 11 (𝑛 ∈ (𝑀..^𝑁) → (𝑛 + 1) ∈ (𝑀...𝑁))
49 fveq2 5496 . . . . . . . . . . . . . 14 (𝑘 = (𝑛 + 1) → (𝐹𝑘) = (𝐹‘(𝑛 + 1)))
5049eleq1d 2239 . . . . . . . . . . . . 13 (𝑘 = (𝑛 + 1) → ((𝐹𝑘) ∈ ℂ ↔ (𝐹‘(𝑛 + 1)) ∈ ℂ))
5150imbi2d 229 . . . . . . . . . . . 12 (𝑘 = (𝑛 + 1) → ((𝜑 → (𝐹𝑘) ∈ ℂ) ↔ (𝜑 → (𝐹‘(𝑛 + 1)) ∈ ℂ)))
52 elfzuz 9977 . . . . . . . . . . . . 13 (𝑘 ∈ (𝑀...𝑁) → 𝑘 ∈ (ℤ𝑀))
5319expcom 115 . . . . . . . . . . . . 13 (𝑘 ∈ (ℤ𝑀) → (𝜑 → (𝐹𝑘) ∈ ℂ))
5452, 53syl 14 . . . . . . . . . . . 12 (𝑘 ∈ (𝑀...𝑁) → (𝜑 → (𝐹𝑘) ∈ ℂ))
5551, 54vtoclga 2796 . . . . . . . . . . 11 ((𝑛 + 1) ∈ (𝑀...𝑁) → (𝜑 → (𝐹‘(𝑛 + 1)) ∈ ℂ))
5648, 55syl 14 . . . . . . . . . 10 (𝑛 ∈ (𝑀..^𝑁) → (𝜑 → (𝐹‘(𝑛 + 1)) ∈ ℂ))
5756impcom 124 . . . . . . . . 9 ((𝜑𝑛 ∈ (𝑀..^𝑁)) → (𝐹‘(𝑛 + 1)) ∈ ℂ)
58573adant3 1012 . . . . . . . 8 ((𝜑𝑛 ∈ (𝑀..^𝑁) ∧ (seq𝑀( · , 𝐹)‘𝑛) # 0) → (𝐹‘(𝑛 + 1)) ∈ ℂ)
59 simp3 994 . . . . . . . 8 ((𝜑𝑛 ∈ (𝑀..^𝑁) ∧ (seq𝑀( · , 𝐹)‘𝑛) # 0) → (seq𝑀( · , 𝐹)‘𝑛) # 0)
6049breq1d 3999 . . . . . . . . . . . . 13 (𝑘 = (𝑛 + 1) → ((𝐹𝑘) # 0 ↔ (𝐹‘(𝑛 + 1)) # 0))
6160imbi2d 229 . . . . . . . . . . . 12 (𝑘 = (𝑛 + 1) → ((𝜑 → (𝐹𝑘) # 0) ↔ (𝜑 → (𝐹‘(𝑛 + 1)) # 0)))
6261, 28vtoclga 2796 . . . . . . . . . . 11 ((𝑛 + 1) ∈ (𝑀...𝑁) → (𝜑 → (𝐹‘(𝑛 + 1)) # 0))
6362impcom 124 . . . . . . . . . 10 ((𝜑 ∧ (𝑛 + 1) ∈ (𝑀...𝑁)) → (𝐹‘(𝑛 + 1)) # 0)
6448, 63sylan2 284 . . . . . . . . 9 ((𝜑𝑛 ∈ (𝑀..^𝑁)) → (𝐹‘(𝑛 + 1)) # 0)
65643adant3 1012 . . . . . . . 8 ((𝜑𝑛 ∈ (𝑀..^𝑁) ∧ (seq𝑀( · , 𝐹)‘𝑛) # 0) → (𝐹‘(𝑛 + 1)) # 0)
6647, 58, 59, 65mulap0d 8576 . . . . . . 7 ((𝜑𝑛 ∈ (𝑀..^𝑁) ∧ (seq𝑀( · , 𝐹)‘𝑛) # 0) → ((seq𝑀( · , 𝐹)‘𝑛) · (𝐹‘(𝑛 + 1))) # 0)
6738, 66eqbrtrd 4011 . . . . . 6 ((𝜑𝑛 ∈ (𝑀..^𝑁) ∧ (seq𝑀( · , 𝐹)‘𝑛) # 0) → (seq𝑀( · , 𝐹)‘(𝑛 + 1)) # 0)
68673exp 1197 . . . . 5 (𝜑 → (𝑛 ∈ (𝑀..^𝑁) → ((seq𝑀( · , 𝐹)‘𝑛) # 0 → (seq𝑀( · , 𝐹)‘(𝑛 + 1)) # 0)))
6968com12 30 . . . 4 (𝑛 ∈ (𝑀..^𝑁) → (𝜑 → ((seq𝑀( · , 𝐹)‘𝑛) # 0 → (seq𝑀( · , 𝐹)‘(𝑛 + 1)) # 0)))
7069a2d 26 . . 3 (𝑛 ∈ (𝑀..^𝑁) → ((𝜑 → (seq𝑀( · , 𝐹)‘𝑛) # 0) → (𝜑 → (seq𝑀( · , 𝐹)‘(𝑛 + 1)) # 0)))
716, 9, 12, 15, 33, 70fzind2 10195 . 2 (𝑁 ∈ (𝑀...𝑁) → (𝜑 → (seq𝑀( · , 𝐹)‘𝑁) # 0))
723, 71mpcom 36 1 (𝜑 → (seq𝑀( · , 𝐹)‘𝑁) # 0)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 103  w3a 973   = wceq 1348  wcel 2141   class class class wbr 3989  cfv 5198  (class class class)co 5853  cc 7772  0cc0 7774  1c1 7775   + caddc 7777   · cmul 7779   # cap 8500  cz 9212  cuz 9487  ...cfz 9965  ..^cfzo 10098  seqcseq 10401
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 609  ax-in2 610  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-13 2143  ax-14 2144  ax-ext 2152  ax-coll 4104  ax-sep 4107  ax-nul 4115  ax-pow 4160  ax-pr 4194  ax-un 4418  ax-setind 4521  ax-iinf 4572  ax-cnex 7865  ax-resscn 7866  ax-1cn 7867  ax-1re 7868  ax-icn 7869  ax-addcl 7870  ax-addrcl 7871  ax-mulcl 7872  ax-mulrcl 7873  ax-addcom 7874  ax-mulcom 7875  ax-addass 7876  ax-mulass 7877  ax-distr 7878  ax-i2m1 7879  ax-0lt1 7880  ax-1rid 7881  ax-0id 7882  ax-rnegex 7883  ax-precex 7884  ax-cnre 7885  ax-pre-ltirr 7886  ax-pre-ltwlin 7887  ax-pre-lttrn 7888  ax-pre-apti 7889  ax-pre-ltadd 7890  ax-pre-mulgt0 7891  ax-pre-mulext 7892
This theorem depends on definitions:  df-bi 116  df-3or 974  df-3an 975  df-tru 1351  df-fal 1354  df-nf 1454  df-sb 1756  df-eu 2022  df-mo 2023  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-ne 2341  df-nel 2436  df-ral 2453  df-rex 2454  df-reu 2455  df-rab 2457  df-v 2732  df-sbc 2956  df-csb 3050  df-dif 3123  df-un 3125  df-in 3127  df-ss 3134  df-nul 3415  df-pw 3568  df-sn 3589  df-pr 3590  df-op 3592  df-uni 3797  df-int 3832  df-iun 3875  df-br 3990  df-opab 4051  df-mpt 4052  df-tr 4088  df-id 4278  df-po 4281  df-iso 4282  df-iord 4351  df-on 4353  df-ilim 4354  df-suc 4356  df-iom 4575  df-xp 4617  df-rel 4618  df-cnv 4619  df-co 4620  df-dm 4621  df-rn 4622  df-res 4623  df-ima 4624  df-iota 5160  df-fun 5200  df-fn 5201  df-f 5202  df-f1 5203  df-fo 5204  df-f1o 5205  df-fv 5206  df-riota 5809  df-ov 5856  df-oprab 5857  df-mpo 5858  df-1st 6119  df-2nd 6120  df-recs 6284  df-frec 6370  df-pnf 7956  df-mnf 7957  df-xr 7958  df-ltxr 7959  df-le 7960  df-sub 8092  df-neg 8093  df-reap 8494  df-ap 8501  df-inn 8879  df-n0 9136  df-z 9213  df-uz 9488  df-fz 9966  df-fzo 10099  df-seqfrec 10402
This theorem is referenced by:  prodfrecap  11509  prodfdivap  11510
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