Theorem climsuselem1 38674

Description: The subsequence index 𝐼 has the expected properties: it belongs to the same upper integers as the original index, and it is always larger or equal than the original index. (Contributed by Glauco Siliprandi, 29-Jun-2017.)

Hypotheses

Ref	Expression
climsuselem1.1	⊢ 𝑍 = (ℤ≥‘𝑀)
climsuselem1.2	⊢ (𝜑 → 𝑀 ∈ ℤ)
climsuselem1.3	⊢ (𝜑 → (𝐼‘𝑀) ∈ 𝑍)
climsuselem1.4	⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → (𝐼‘(𝑘 + 1)) ∈ (ℤ≥‘((𝐼‘𝑘) + 1)))

Assertion

Ref	Expression
climsuselem1	⊢ ((𝜑 ∧ 𝐾 ∈ 𝑍) → (𝐼‘𝐾) ∈ (ℤ≥‘𝐾))

Distinct variable groups:   𝜑,𝑘   𝑘,𝐼   𝑘,𝑀   𝑘,𝑍

Allowed substitution hint:   𝐾(𝑘)

Proof of Theorem climsuselem1

Dummy variable 𝑗 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		climsuselem1.1	. . . . 5 ⊢ 𝑍 = (ℤ≥‘𝑀)
2	1	eleq2i 2680	. . . 4 ⊢ (𝐾 ∈ 𝑍 ↔ 𝐾 ∈ (ℤ≥‘𝑀))
3	2	biimpi 205	. . 3 ⊢ (𝐾 ∈ 𝑍 → 𝐾 ∈ (ℤ≥‘𝑀))
4	3	adantl 481	. 2 ⊢ ((𝜑 ∧ 𝐾 ∈ 𝑍) → 𝐾 ∈ (ℤ≥‘𝑀))
5		simpl 472	. 2 ⊢ ((𝜑 ∧ 𝐾 ∈ 𝑍) → 𝜑)
6		fveq2 6103	. . . . 5 ⊢ (𝑗 = 𝑀 → (𝐼‘𝑗) = (𝐼‘𝑀))
7		fveq2 6103	. . . . 5 ⊢ (𝑗 = 𝑀 → (ℤ≥‘𝑗) = (ℤ≥‘𝑀))
8	6, 7	eleq12d 2682	. . . 4 ⊢ (𝑗 = 𝑀 → ((𝐼‘𝑗) ∈ (ℤ≥‘𝑗) ↔ (𝐼‘𝑀) ∈ (ℤ≥‘𝑀)))
9	8	imbi2d 329	. . 3 ⊢ (𝑗 = 𝑀 → ((𝜑 → (𝐼‘𝑗) ∈ (ℤ≥‘𝑗)) ↔ (𝜑 → (𝐼‘𝑀) ∈ (ℤ≥‘𝑀))))
10		fveq2 6103	. . . . 5 ⊢ (𝑗 = 𝑘 → (𝐼‘𝑗) = (𝐼‘𝑘))
11		fveq2 6103	. . . . 5 ⊢ (𝑗 = 𝑘 → (ℤ≥‘𝑗) = (ℤ≥‘𝑘))
12	10, 11	eleq12d 2682	. . . 4 ⊢ (𝑗 = 𝑘 → ((𝐼‘𝑗) ∈ (ℤ≥‘𝑗) ↔ (𝐼‘𝑘) ∈ (ℤ≥‘𝑘)))
13	12	imbi2d 329	. . 3 ⊢ (𝑗 = 𝑘 → ((𝜑 → (𝐼‘𝑗) ∈ (ℤ≥‘𝑗)) ↔ (𝜑 → (𝐼‘𝑘) ∈ (ℤ≥‘𝑘))))
14		fveq2 6103	. . . . 5 ⊢ (𝑗 = (𝑘 + 1) → (𝐼‘𝑗) = (𝐼‘(𝑘 + 1)))
15		fveq2 6103	. . . . 5 ⊢ (𝑗 = (𝑘 + 1) → (ℤ≥‘𝑗) = (ℤ≥‘(𝑘 + 1)))
16	14, 15	eleq12d 2682	. . . 4 ⊢ (𝑗 = (𝑘 + 1) → ((𝐼‘𝑗) ∈ (ℤ≥‘𝑗) ↔ (𝐼‘(𝑘 + 1)) ∈ (ℤ≥‘(𝑘 + 1))))
17	16	imbi2d 329	. . 3 ⊢ (𝑗 = (𝑘 + 1) → ((𝜑 → (𝐼‘𝑗) ∈ (ℤ≥‘𝑗)) ↔ (𝜑 → (𝐼‘(𝑘 + 1)) ∈ (ℤ≥‘(𝑘 + 1)))))
18		fveq2 6103	. . . . 5 ⊢ (𝑗 = 𝐾 → (𝐼‘𝑗) = (𝐼‘𝐾))
19		fveq2 6103	. . . . 5 ⊢ (𝑗 = 𝐾 → (ℤ≥‘𝑗) = (ℤ≥‘𝐾))
20	18, 19	eleq12d 2682	. . . 4 ⊢ (𝑗 = 𝐾 → ((𝐼‘𝑗) ∈ (ℤ≥‘𝑗) ↔ (𝐼‘𝐾) ∈ (ℤ≥‘𝐾)))
21	20	imbi2d 329	. . 3 ⊢ (𝑗 = 𝐾 → ((𝜑 → (𝐼‘𝑗) ∈ (ℤ≥‘𝑗)) ↔ (𝜑 → (𝐼‘𝐾) ∈ (ℤ≥‘𝐾))))
22		climsuselem1.3	. . . . 5 ⊢ (𝜑 → (𝐼‘𝑀) ∈ 𝑍)
23	22, 1	syl6eleq 2698	. . . 4 ⊢ (𝜑 → (𝐼‘𝑀) ∈ (ℤ≥‘𝑀))
24	23	a1i 11	. . 3 ⊢ (𝑀 ∈ ℤ → (𝜑 → (𝐼‘𝑀) ∈ (ℤ≥‘𝑀)))
25		simpr 476	. . . . 5 ⊢ (((𝑘 ∈ (ℤ≥‘𝑀) ∧ (𝜑 → (𝐼‘𝑘) ∈ (ℤ≥‘𝑘))) ∧ 𝜑) → 𝜑)
26		simpll 786	. . . . 5 ⊢ (((𝑘 ∈ (ℤ≥‘𝑀) ∧ (𝜑 → (𝐼‘𝑘) ∈ (ℤ≥‘𝑘))) ∧ 𝜑) → 𝑘 ∈ (ℤ≥‘𝑀))
27		simplr 788	. . . . . 6 ⊢ (((𝑘 ∈ (ℤ≥‘𝑀) ∧ (𝜑 → (𝐼‘𝑘) ∈ (ℤ≥‘𝑘))) ∧ 𝜑) → (𝜑 → (𝐼‘𝑘) ∈ (ℤ≥‘𝑘)))
28	25, 27	mpd 15	. . . . 5 ⊢ (((𝑘 ∈ (ℤ≥‘𝑀) ∧ (𝜑 → (𝐼‘𝑘) ∈ (ℤ≥‘𝑘))) ∧ 𝜑) → (𝐼‘𝑘) ∈ (ℤ≥‘𝑘))
29		eluzelz 11573	. . . . . . . . . 10 ⊢ (𝑘 ∈ (ℤ≥‘𝑀) → 𝑘 ∈ ℤ)
30	29	3ad2ant2 1076	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ (ℤ≥‘𝑀) ∧ (𝐼‘𝑘) ∈ (ℤ≥‘𝑘)) → 𝑘 ∈ ℤ)
31	30	peano2zd 11361	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ (ℤ≥‘𝑀) ∧ (𝐼‘𝑘) ∈ (ℤ≥‘𝑘)) → (𝑘 + 1) ∈ ℤ)
32	31	zred 11358	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ (ℤ≥‘𝑀) ∧ (𝐼‘𝑘) ∈ (ℤ≥‘𝑘)) → (𝑘 + 1) ∈ ℝ)
33		eluzelre 11574	. . . . . . . . 9 ⊢ ((𝐼‘𝑘) ∈ (ℤ≥‘𝑘) → (𝐼‘𝑘) ∈ ℝ)
34	33	3ad2ant3 1077	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ (ℤ≥‘𝑀) ∧ (𝐼‘𝑘) ∈ (ℤ≥‘𝑘)) → (𝐼‘𝑘) ∈ ℝ)
35		1red 9934	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ (ℤ≥‘𝑀) ∧ (𝐼‘𝑘) ∈ (ℤ≥‘𝑘)) → 1 ∈ ℝ)
36	34, 35	readdcld 9948	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ (ℤ≥‘𝑀) ∧ (𝐼‘𝑘) ∈ (ℤ≥‘𝑘)) → ((𝐼‘𝑘) + 1) ∈ ℝ)
37	1	eqimss2i 3623	. . . . . . . . . . . . . 14 ⊢ (ℤ≥‘𝑀) ⊆ 𝑍
38	37	a1i 11	. . . . . . . . . . . . 13 ⊢ (𝜑 → (ℤ≥‘𝑀) ⊆ 𝑍)
39	38	sseld 3567	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝑘 ∈ (ℤ≥‘𝑀) → 𝑘 ∈ 𝑍))
40	39	imdistani 722	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑘 ∈ (ℤ≥‘𝑀)) → (𝜑 ∧ 𝑘 ∈ 𝑍))
41		climsuselem1.4	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → (𝐼‘(𝑘 + 1)) ∈ (ℤ≥‘((𝐼‘𝑘) + 1)))
42	40, 41	syl 17	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑘 ∈ (ℤ≥‘𝑀)) → (𝐼‘(𝑘 + 1)) ∈ (ℤ≥‘((𝐼‘𝑘) + 1)))
43	42	3adant3 1074	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ (ℤ≥‘𝑀) ∧ (𝐼‘𝑘) ∈ (ℤ≥‘𝑘)) → (𝐼‘(𝑘 + 1)) ∈ (ℤ≥‘((𝐼‘𝑘) + 1)))
44		eluzelz 11573	. . . . . . . . 9 ⊢ ((𝐼‘(𝑘 + 1)) ∈ (ℤ≥‘((𝐼‘𝑘) + 1)) → (𝐼‘(𝑘 + 1)) ∈ ℤ)
45	43, 44	syl 17	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ (ℤ≥‘𝑀) ∧ (𝐼‘𝑘) ∈ (ℤ≥‘𝑘)) → (𝐼‘(𝑘 + 1)) ∈ ℤ)
46	45	zred 11358	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ (ℤ≥‘𝑀) ∧ (𝐼‘𝑘) ∈ (ℤ≥‘𝑘)) → (𝐼‘(𝑘 + 1)) ∈ ℝ)
47	30	zred 11358	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ (ℤ≥‘𝑀) ∧ (𝐼‘𝑘) ∈ (ℤ≥‘𝑘)) → 𝑘 ∈ ℝ)
48		eluzle 11576	. . . . . . . . 9 ⊢ ((𝐼‘𝑘) ∈ (ℤ≥‘𝑘) → 𝑘 ≤ (𝐼‘𝑘))
49	48	3ad2ant3 1077	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ (ℤ≥‘𝑀) ∧ (𝐼‘𝑘) ∈ (ℤ≥‘𝑘)) → 𝑘 ≤ (𝐼‘𝑘))
50	47, 34, 35, 49	leadd1dd 10520	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ (ℤ≥‘𝑀) ∧ (𝐼‘𝑘) ∈ (ℤ≥‘𝑘)) → (𝑘 + 1) ≤ ((𝐼‘𝑘) + 1))
51		eluzle 11576	. . . . . . . 8 ⊢ ((𝐼‘(𝑘 + 1)) ∈ (ℤ≥‘((𝐼‘𝑘) + 1)) → ((𝐼‘𝑘) + 1) ≤ (𝐼‘(𝑘 + 1)))
52	43, 51	syl 17	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ (ℤ≥‘𝑀) ∧ (𝐼‘𝑘) ∈ (ℤ≥‘𝑘)) → ((𝐼‘𝑘) + 1) ≤ (𝐼‘(𝑘 + 1)))
53	32, 36, 46, 50, 52	letrd 10073	. . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ (ℤ≥‘𝑀) ∧ (𝐼‘𝑘) ∈ (ℤ≥‘𝑘)) → (𝑘 + 1) ≤ (𝐼‘(𝑘 + 1)))
54		eluz 11577	. . . . . . 7 ⊢ (((𝑘 + 1) ∈ ℤ ∧ (𝐼‘(𝑘 + 1)) ∈ ℤ) → ((𝐼‘(𝑘 + 1)) ∈ (ℤ≥‘(𝑘 + 1)) ↔ (𝑘 + 1) ≤ (𝐼‘(𝑘 + 1))))
55	31, 45, 54	syl2anc 691	. . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ (ℤ≥‘𝑀) ∧ (𝐼‘𝑘) ∈ (ℤ≥‘𝑘)) → ((𝐼‘(𝑘 + 1)) ∈ (ℤ≥‘(𝑘 + 1)) ↔ (𝑘 + 1) ≤ (𝐼‘(𝑘 + 1))))
56	53, 55	mpbird 246	. . . . 5 ⊢ ((𝜑 ∧ 𝑘 ∈ (ℤ≥‘𝑀) ∧ (𝐼‘𝑘) ∈ (ℤ≥‘𝑘)) → (𝐼‘(𝑘 + 1)) ∈ (ℤ≥‘(𝑘 + 1)))
57	25, 26, 28, 56	syl3anc 1318	. . . 4 ⊢ (((𝑘 ∈ (ℤ≥‘𝑀) ∧ (𝜑 → (𝐼‘𝑘) ∈ (ℤ≥‘𝑘))) ∧ 𝜑) → (𝐼‘(𝑘 + 1)) ∈ (ℤ≥‘(𝑘 + 1)))
58	57	exp31 628	. . 3 ⊢ (𝑘 ∈ (ℤ≥‘𝑀) → ((𝜑 → (𝐼‘𝑘) ∈ (ℤ≥‘𝑘)) → (𝜑 → (𝐼‘(𝑘 + 1)) ∈ (ℤ≥‘(𝑘 + 1)))))
59	9, 13, 17, 21, 24, 58	uzind4 11622	. 2 ⊢ (𝐾 ∈ (ℤ≥‘𝑀) → (𝜑 → (𝐼‘𝐾) ∈ (ℤ≥‘𝐾)))
60	4, 5, 59	sylc 63	1 ⊢ ((𝜑 ∧ 𝐾 ∈ 𝑍) → (𝐼‘𝐾) ∈ (ℤ≥‘𝐾))

Syntax hints:   → wi 4   ↔ wb 195   ∧ wa 383   ∧ w3a 1031   = wceq 1475   ∈ wcel 1977   ⊆ wss 3540   class class class wbr 4583  ‘cfv 5804  (class class class)co 6549  ℝcr 9814  1c1 9816   + caddc 9818   ≤ cle 9954  ℤcz 11254  ℤ_≥cuz 11563

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-cnex 9871  ax-resscn 9872  ax-1cn 9873  ax-icn 9874  ax-addcl 9875  ax-addrcl 9876  ax-mulcl 9877  ax-mulrcl 9878  ax-mulcom 9879  ax-addass 9880  ax-mulass 9881  ax-distr 9882  ax-i2m1 9883  ax-1ne0 9884  ax-1rid 9885  ax-rnegex 9886  ax-rrecex 9887  ax-cnre 9888  ax-pre-lttri 9889  ax-pre-lttrn 9890  ax-pre-ltadd 9891  ax-pre-mulgt0 9892

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-nel 2783  df-ral 2901  df-rex 2902  df-reu 2903  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-er 7629  df-en 7842  df-dom 7843  df-sdom 7844  df-pnf 9955  df-mnf 9956  df-xr 9957  df-ltxr 9958  df-le 9959  df-sub 10147  df-neg 10148  df-nn 10898  df-n0 11170  df-z 11255  df-uz 11564

This theorem is referenced by:  climsuse  38675