Theorem ntrivcvgap0 11512

Description: A product that converges to a value apart from zero converges non-trivially. (Contributed by Scott Fenton, 18-Dec-2017.)

Hypotheses

Ref	Expression
ntrivcvgn0.1	⊢ 𝑍 = (ℤ≥‘𝑀)
ntrivcvgn0.2	⊢ (𝜑 → 𝑀 ∈ ℤ)
ntrivcvgn0.3	⊢ (𝜑 → seq𝑀( · , 𝐹) ⇝ 𝑋)
ntrivcvgap0.4	⊢ (𝜑 → 𝑋 # 0)

Assertion

Ref	Expression
ntrivcvgap0	⊢ (𝜑 → ∃𝑛 ∈ 𝑍 ∃𝑦(𝑦 # 0 ∧ seq𝑛( · , 𝐹) ⇝ 𝑦))

Distinct variable groups:   𝑛,𝐹,𝑦   𝑛,𝑀,𝑦   𝑦,𝑋   𝑛,𝑍

Allowed substitution hints:   𝜑(𝑦,𝑛)   𝑋(𝑛)   𝑍(𝑦)

Proof of Theorem ntrivcvgap0

Step	Hyp	Ref	Expression
1		ntrivcvgn0.2	. . . 4 ⊢ (𝜑 → 𝑀 ∈ ℤ)
2		uzid 9501	. . . 4 ⊢ (𝑀 ∈ ℤ → 𝑀 ∈ (ℤ≥‘𝑀))
3	1, 2	syl 14	. . 3 ⊢ (𝜑 → 𝑀 ∈ (ℤ≥‘𝑀))
4		ntrivcvgn0.1	. . 3 ⊢ 𝑍 = (ℤ≥‘𝑀)
5	3, 4	eleqtrrdi 2264	. 2 ⊢ (𝜑 → 𝑀 ∈ 𝑍)
6		ntrivcvgn0.3	. . . 4 ⊢ (𝜑 → seq𝑀( · , 𝐹) ⇝ 𝑋)
7		climrel 11243	. . . . 5 ⊢ Rel ⇝
8	7	brrelex2i 4655	. . . 4 ⊢ (seq𝑀( · , 𝐹) ⇝ 𝑋 → 𝑋 ∈ V)
9	6, 8	syl 14	. . 3 ⊢ (𝜑 → 𝑋 ∈ V)
10		ntrivcvgap0.4	. . . 4 ⊢ (𝜑 → 𝑋 # 0)
11	10, 6	jca 304	. . 3 ⊢ (𝜑 → (𝑋 # 0 ∧ seq𝑀( · , 𝐹) ⇝ 𝑋))
12		breq1 3992	. . . 4 ⊢ (𝑦 = 𝑋 → (𝑦 # 0 ↔ 𝑋 # 0))
13		breq2 3993	. . . 4 ⊢ (𝑦 = 𝑋 → (seq𝑀( · , 𝐹) ⇝ 𝑦 ↔ seq𝑀( · , 𝐹) ⇝ 𝑋))
14	12, 13	anbi12d 470	. . 3 ⊢ (𝑦 = 𝑋 → ((𝑦 # 0 ∧ seq𝑀( · , 𝐹) ⇝ 𝑦) ↔ (𝑋 # 0 ∧ seq𝑀( · , 𝐹) ⇝ 𝑋)))
15	9, 11, 14	elabd 2875	. 2 ⊢ (𝜑 → ∃𝑦(𝑦 # 0 ∧ seq𝑀( · , 𝐹) ⇝ 𝑦))
16		seqeq1 10404	. . . . . 6 ⊢ (𝑛 = 𝑀 → seq𝑛( · , 𝐹) = seq𝑀( · , 𝐹))
17	16	breq1d 3999	. . . . 5 ⊢ (𝑛 = 𝑀 → (seq𝑛( · , 𝐹) ⇝ 𝑦 ↔ seq𝑀( · , 𝐹) ⇝ 𝑦))
18	17	anbi2d 461	. . . 4 ⊢ (𝑛 = 𝑀 → ((𝑦 # 0 ∧ seq𝑛( · , 𝐹) ⇝ 𝑦) ↔ (𝑦 # 0 ∧ seq𝑀( · , 𝐹) ⇝ 𝑦)))
19	18	exbidv 1818	. . 3 ⊢ (𝑛 = 𝑀 → (∃𝑦(𝑦 # 0 ∧ seq𝑛( · , 𝐹) ⇝ 𝑦) ↔ ∃𝑦(𝑦 # 0 ∧ seq𝑀( · , 𝐹) ⇝ 𝑦)))
20	19	rspcev 2834	. 2 ⊢ ((𝑀 ∈ 𝑍 ∧ ∃𝑦(𝑦 # 0 ∧ seq𝑀( · , 𝐹) ⇝ 𝑦)) → ∃𝑛 ∈ 𝑍 ∃𝑦(𝑦 # 0 ∧ seq𝑛( · , 𝐹) ⇝ 𝑦))
21	5, 15, 20	syl2anc 409	1 ⊢ (𝜑 → ∃𝑛 ∈ 𝑍 ∃𝑦(𝑦 # 0 ∧ seq𝑛( · , 𝐹) ⇝ 𝑦))

Syntax hints:   → wi 4   ∧ wa 103   = wceq 1348  ∃wex 1485   ∈ wcel 2141  ∃wrex 2449  Vcvv 2730   class class class wbr 3989  ‘cfv 5198  0cc0 7774   · cmul 7779   # cap 8500  ℤcz 9212  ℤ_≥cuz 9487  seqcseq 10401   ⇝ cli 11241

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-sep 4107  ax-pow 4160  ax-pr 4194  ax-un 4418  ax-setind 4521  ax-cnex 7865  ax-resscn 7866  ax-pre-ltirr 7886

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-rab 2457  df-v 2732  df-sbc 2956  df-dif 3123  df-un 3125  df-in 3127  df-ss 3134  df-pw 3568  df-sn 3589  df-pr 3590  df-op 3592  df-uni 3797  df-br 3990  df-opab 4051  df-mpt 4052  df-id 4278  df-xp 4617  df-rel 4618  df-cnv 4619  df-co 4620  df-dm 4621  df-rn 4622  df-res 4623  df-iota 5160  df-fun 5200  df-fv 5206  df-ov 5856  df-oprab 5857  df-mpo 5858  df-recs 6284  df-frec 6370  df-pnf 7956  df-mnf 7957  df-xr 7958  df-ltxr 7959  df-le 7960  df-neg 8093  df-z 9213  df-uz 9488  df-seqfrec 10402  df-clim 11242

This theorem is referenced by:  zprodap0  11544