Theorem ntrivcvgap0 11575

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 9560	. . . 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 2283	. 2 ⊢ (𝜑 → 𝑀 ∈ 𝑍)
6		ntrivcvgn0.3	. . . 4 ⊢ (𝜑 → seq𝑀( · , 𝐹) ⇝ 𝑋)
7		climrel 11306	. . . . 5 ⊢ Rel ⇝
8	7	brrelex2i 4685	. . . 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 306	. . 3 ⊢ (𝜑 → (𝑋 # 0 ∧ seq𝑀( · , 𝐹) ⇝ 𝑋))
12		breq1 4021	. . . 4 ⊢ (𝑦 = 𝑋 → (𝑦 # 0 ↔ 𝑋 # 0))
13		breq2 4022	. . . 4 ⊢ (𝑦 = 𝑋 → (seq𝑀( · , 𝐹) ⇝ 𝑦 ↔ seq𝑀( · , 𝐹) ⇝ 𝑋))
14	12, 13	anbi12d 473	. . 3 ⊢ (𝑦 = 𝑋 → ((𝑦 # 0 ∧ seq𝑀( · , 𝐹) ⇝ 𝑦) ↔ (𝑋 # 0 ∧ seq𝑀( · , 𝐹) ⇝ 𝑋)))
15	9, 11, 14	elabd 2897	. 2 ⊢ (𝜑 → ∃𝑦(𝑦 # 0 ∧ seq𝑀( · , 𝐹) ⇝ 𝑦))
16		seqeq1 10466	. . . . . 6 ⊢ (𝑛 = 𝑀 → seq𝑛( · , 𝐹) = seq𝑀( · , 𝐹))
17	16	breq1d 4028	. . . . 5 ⊢ (𝑛 = 𝑀 → (seq𝑛( · , 𝐹) ⇝ 𝑦 ↔ seq𝑀( · , 𝐹) ⇝ 𝑦))
18	17	anbi2d 464	. . . 4 ⊢ (𝑛 = 𝑀 → ((𝑦 # 0 ∧ seq𝑛( · , 𝐹) ⇝ 𝑦) ↔ (𝑦 # 0 ∧ seq𝑀( · , 𝐹) ⇝ 𝑦)))
19	18	exbidv 1836	. . 3 ⊢ (𝑛 = 𝑀 → (∃𝑦(𝑦 # 0 ∧ seq𝑛( · , 𝐹) ⇝ 𝑦) ↔ ∃𝑦(𝑦 # 0 ∧ seq𝑀( · , 𝐹) ⇝ 𝑦)))
20	19	rspcev 2856	. 2 ⊢ ((𝑀 ∈ 𝑍 ∧ ∃𝑦(𝑦 # 0 ∧ seq𝑀( · , 𝐹) ⇝ 𝑦)) → ∃𝑛 ∈ 𝑍 ∃𝑦(𝑦 # 0 ∧ seq𝑛( · , 𝐹) ⇝ 𝑦))
21	5, 15, 20	syl2anc 411	1 ⊢ (𝜑 → ∃𝑛 ∈ 𝑍 ∃𝑦(𝑦 # 0 ∧ seq𝑛( · , 𝐹) ⇝ 𝑦))

Syntax hints:   → wi 4   ∧ wa 104   = wceq 1364  ∃wex 1503   ∈ wcel 2160  ∃wrex 2469  Vcvv 2752   class class class wbr 4018  ‘cfv 5231  0cc0 7829   · cmul 7834   # cap 8556  ℤcz 9271  ℤ_≥cuz 9546  seqcseq 10463   ⇝ cli 11304

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 615  ax-in2 616  ax-io 710  ax-5 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-10 1516  ax-11 1517  ax-i12 1518  ax-bndl 1520  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546  ax-13 2162  ax-14 2163  ax-ext 2171  ax-sep 4136  ax-pow 4189  ax-pr 4224  ax-un 4448  ax-setind 4551  ax-cnex 7920  ax-resscn 7921  ax-pre-ltirr 7941

This theorem depends on definitions:  df-bi 117  df-3or 981  df-3an 982  df-tru 1367  df-fal 1370  df-nf 1472  df-sb 1774  df-eu 2041  df-mo 2042  df-clab 2176  df-cleq 2182  df-clel 2185  df-nfc 2321  df-ne 2361  df-nel 2456  df-ral 2473  df-rex 2474  df-rab 2477  df-v 2754  df-sbc 2978  df-dif 3146  df-un 3148  df-in 3150  df-ss 3157  df-pw 3592  df-sn 3613  df-pr 3614  df-op 3616  df-uni 3825  df-br 4019  df-opab 4080  df-mpt 4081  df-id 4308  df-xp 4647  df-rel 4648  df-cnv 4649  df-co 4650  df-dm 4651  df-rn 4652  df-res 4653  df-iota 5193  df-fun 5233  df-fv 5239  df-ov 5894  df-oprab 5895  df-mpo 5896  df-recs 6324  df-frec 6410  df-pnf 8012  df-mnf 8013  df-xr 8014  df-ltxr 8015  df-le 8016  df-neg 8149  df-z 9272  df-uz 9547  df-seqfrec 10464  df-clim 11305

This theorem is referenced by:  zprodap0  11607