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Theorem resqrexlemdecn 11021

Description: Lemma for resqrex 11035. The sequence is decreasing. (Contributed by Jim Kingdon, 31-Jul-2021.)

**Hypotheses**
Ref	Expression
resqrexlemex.seq	⊢ 𝐹 = seq1((𝑦 ∈ ℝ⁺, 𝑧 ∈ ℝ⁺ ↦ ((𝑦 + (𝐴 / 𝑦)) / 2)), (ℕ × {(1 + 𝐴)}))
resqrexlemex.a	⊢ (𝜑 → 𝐴 ∈ ℝ)
resqrexlemex.agt0	⊢ (𝜑 → 0 ≤ 𝐴)
resqrexlemdecn.n	⊢ (𝜑 → 𝑁 ∈ ℕ)
resqrexlemdecn.m	⊢ (𝜑 → 𝑀 ∈ ℕ)
resqrexlemdecn.nm	⊢ (𝜑 → 𝑁 < 𝑀)

**Assertion**
Ref	Expression
resqrexlemdecn	⊢ (𝜑 → (𝐹‘𝑀) < (𝐹‘𝑁))

Distinct variable groups: 𝑦,𝐴,𝑧 𝜑,𝑦,𝑧 Allowed substitution hints: 𝐹(𝑦,𝑧) 𝑀(𝑦,𝑧) 𝑁(𝑦,𝑧)

Proof of Theorem resqrexlemdecn Dummy variables 𝑘 𝑤 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		resqrexlemdecn.n	. . . . 5 ⊢ (𝜑 → 𝑁 ∈ ℕ)
2	1	nnzd 9374	. . . 4 ⊢ (𝜑 → 𝑁 ∈ ℤ)
3	2	peano2zd 9378	. . 3 ⊢ (𝜑 → (𝑁 + 1) ∈ ℤ)
4		resqrexlemdecn.m	. . . 4 ⊢ (𝜑 → 𝑀 ∈ ℕ)
5	4	nnzd 9374	. . 3 ⊢ (𝜑 → 𝑀 ∈ ℤ)
6		resqrexlemdecn.nm	. . . 4 ⊢ (𝜑 → 𝑁 < 𝑀)
7		nnltp1le 9313	. . . . 5 ⊢ ((𝑁 ∈ ℕ ∧ 𝑀 ∈ ℕ) → (𝑁 < 𝑀 ↔ (𝑁 + 1) ≤ 𝑀))
8	1, 4, 7	syl2anc 411	. . . 4 ⊢ (𝜑 → (𝑁 < 𝑀 ↔ (𝑁 + 1) ≤ 𝑀))
9	6, 8	mpbid 147	. . 3 ⊢ (𝜑 → (𝑁 + 1) ≤ 𝑀)
10		fveq2 5516	. . . . . 6 ⊢ (𝑤 = (𝑁 + 1) → (𝐹‘𝑤) = (𝐹‘(𝑁 + 1)))
11	10	breq1d 4014	. . . . 5 ⊢ (𝑤 = (𝑁 + 1) → ((𝐹‘𝑤) < (𝐹‘𝑁) ↔ (𝐹‘(𝑁 + 1)) < (𝐹‘𝑁)))
12	11	imbi2d 230	. . . 4 ⊢ (𝑤 = (𝑁 + 1) → ((𝜑 → (𝐹‘𝑤) < (𝐹‘𝑁)) ↔ (𝜑 → (𝐹‘(𝑁 + 1)) < (𝐹‘𝑁))))
13		fveq2 5516	. . . . . 6 ⊢ (𝑤 = 𝑘 → (𝐹‘𝑤) = (𝐹‘𝑘))
14	13	breq1d 4014	. . . . 5 ⊢ (𝑤 = 𝑘 → ((𝐹‘𝑤) < (𝐹‘𝑁) ↔ (𝐹‘𝑘) < (𝐹‘𝑁)))
15	14	imbi2d 230	. . . 4 ⊢ (𝑤 = 𝑘 → ((𝜑 → (𝐹‘𝑤) < (𝐹‘𝑁)) ↔ (𝜑 → (𝐹‘𝑘) < (𝐹‘𝑁))))
16		fveq2 5516	. . . . . 6 ⊢ (𝑤 = (𝑘 + 1) → (𝐹‘𝑤) = (𝐹‘(𝑘 + 1)))
17	16	breq1d 4014	. . . . 5 ⊢ (𝑤 = (𝑘 + 1) → ((𝐹‘𝑤) < (𝐹‘𝑁) ↔ (𝐹‘(𝑘 + 1)) < (𝐹‘𝑁)))
18	17	imbi2d 230	. . . 4 ⊢ (𝑤 = (𝑘 + 1) → ((𝜑 → (𝐹‘𝑤) < (𝐹‘𝑁)) ↔ (𝜑 → (𝐹‘(𝑘 + 1)) < (𝐹‘𝑁))))
19		fveq2 5516	. . . . . 6 ⊢ (𝑤 = 𝑀 → (𝐹‘𝑤) = (𝐹‘𝑀))
20	19	breq1d 4014	. . . . 5 ⊢ (𝑤 = 𝑀 → ((𝐹‘𝑤) < (𝐹‘𝑁) ↔ (𝐹‘𝑀) < (𝐹‘𝑁)))
21	20	imbi2d 230	. . . 4 ⊢ (𝑤 = 𝑀 → ((𝜑 → (𝐹‘𝑤) < (𝐹‘𝑁)) ↔ (𝜑 → (𝐹‘𝑀) < (𝐹‘𝑁))))
22		resqrexlemex.seq	. . . . . . 7 ⊢ 𝐹 = seq1((𝑦 ∈ ℝ⁺, 𝑧 ∈ ℝ⁺ ↦ ((𝑦 + (𝐴 / 𝑦)) / 2)), (ℕ × {(1 + 𝐴)}))
23		resqrexlemex.a	. . . . . . 7 ⊢ (𝜑 → 𝐴 ∈ ℝ)
24		resqrexlemex.agt0	. . . . . . 7 ⊢ (𝜑 → 0 ≤ 𝐴)
25	22, 23, 24	resqrexlemdec 11020	. . . . . 6 ⊢ ((𝜑 ∧ 𝑁 ∈ ℕ) → (𝐹‘(𝑁 + 1)) < (𝐹‘𝑁))
26	1, 25	mpdan 421	. . . . 5 ⊢ (𝜑 → (𝐹‘(𝑁 + 1)) < (𝐹‘𝑁))
27	26	a1i 9	. . . 4 ⊢ ((𝑁 + 1) ∈ ℤ → (𝜑 → (𝐹‘(𝑁 + 1)) < (𝐹‘𝑁)))
28	22, 23, 24	resqrexlemf 11016	. . . . . . . . . . 11 ⊢ (𝜑 → 𝐹:ℕ⟶ℝ⁺)
29	28	ad2antrr 488	. . . . . . . . . 10 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → 𝐹:ℕ⟶ℝ⁺)
30		simplr2 1040	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → 𝑘 ∈ ℤ)
31		1red 7972	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → 1 ∈ ℝ)
32	3	ad2antrr 488	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → (𝑁 + 1) ∈ ℤ)
33	32	zred 9375	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → (𝑁 + 1) ∈ ℝ)
34	30	zred 9375	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → 𝑘 ∈ ℝ)
35	1	nnred 8932	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → 𝑁 ∈ ℝ)
36	1	nngt0d 8963	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → 0 < 𝑁)
37		0re 7957	. . . . . . . . . . . . . . . . 17 ⊢ 0 ∈ ℝ
38		ltle 8045	. . . . . . . . . . . . . . . . 17 ⊢ ((0 ∈ ℝ ∧ 𝑁 ∈ ℝ) → (0 < 𝑁 → 0 ≤ 𝑁))
39	37, 38	mpan 424	. . . . . . . . . . . . . . . 16 ⊢ (𝑁 ∈ ℝ → (0 < 𝑁 → 0 ≤ 𝑁))
40	35, 36, 39	sylc 62	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → 0 ≤ 𝑁)
41		1red 7972	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → 1 ∈ ℝ)
42	41, 35	addge02d 8491	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → (0 ≤ 𝑁 ↔ 1 ≤ (𝑁 + 1)))
43	40, 42	mpbid 147	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 1 ≤ (𝑁 + 1))
44	43	ad2antrr 488	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → 1 ≤ (𝑁 + 1))
45		simplr3 1041	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → (𝑁 + 1) ≤ 𝑘)
46	31, 33, 34, 44, 45	letrd 8081	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → 1 ≤ 𝑘)
47		elnnz1 9276	. . . . . . . . . . . 12 ⊢ (𝑘 ∈ ℕ ↔ (𝑘 ∈ ℤ ∧ 1 ≤ 𝑘))
48	30, 46, 47	sylanbrc 417	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → 𝑘 ∈ ℕ)
49	48	peano2nnd 8934	. . . . . . . . . 10 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → (𝑘 + 1) ∈ ℕ)
50	29, 49	ffvelcdmd 5653	. . . . . . . . 9 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → (𝐹‘(𝑘 + 1)) ∈ ℝ⁺)
51	50	rpred 9696	. . . . . . . 8 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → (𝐹‘(𝑘 + 1)) ∈ ℝ)
52	29, 48	ffvelcdmd 5653	. . . . . . . . 9 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → (𝐹‘𝑘) ∈ ℝ⁺)
53	52	rpred 9696	. . . . . . . 8 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → (𝐹‘𝑘) ∈ ℝ)
54	1	ad2antrr 488	. . . . . . . . . 10 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → 𝑁 ∈ ℕ)
55	29, 54	ffvelcdmd 5653	. . . . . . . . 9 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → (𝐹‘𝑁) ∈ ℝ⁺)
56	55	rpred 9696	. . . . . . . 8 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → (𝐹‘𝑁) ∈ ℝ)
57		simpll 527	. . . . . . . . 9 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → 𝜑)
58	22, 23, 24	resqrexlemdec 11020	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ) → (𝐹‘(𝑘 + 1)) < (𝐹‘𝑘))
59	57, 48, 58	syl2anc 411	. . . . . . . 8 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → (𝐹‘(𝑘 + 1)) < (𝐹‘𝑘))
60		simpr 110	. . . . . . . 8 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → (𝐹‘𝑘) < (𝐹‘𝑁))
61	51, 53, 56, 59, 60	lttrd 8083	. . . . . . 7 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → (𝐹‘(𝑘 + 1)) < (𝐹‘𝑁))
62	61	ex 115	. . . . . 6 ⊢ ((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) → ((𝐹‘𝑘) < (𝐹‘𝑁) → (𝐹‘(𝑘 + 1)) < (𝐹‘𝑁)))
63	62	expcom 116	. . . . 5 ⊢ (((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘) → (𝜑 → ((𝐹‘𝑘) < (𝐹‘𝑁) → (𝐹‘(𝑘 + 1)) < (𝐹‘𝑁))))
64	63	a2d 26	. . . 4 ⊢ (((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘) → ((𝜑 → (𝐹‘𝑘) < (𝐹‘𝑁)) → (𝜑 → (𝐹‘(𝑘 + 1)) < (𝐹‘𝑁))))
65	12, 15, 18, 21, 27, 64	uzind 9364	. . 3 ⊢ (((𝑁 + 1) ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑀) → (𝜑 → (𝐹‘𝑀) < (𝐹‘𝑁)))
66	3, 5, 9, 65	syl3anc 1238	. 2 ⊢ (𝜑 → (𝜑 → (𝐹‘𝑀) < (𝐹‘𝑁)))
67	66	pm2.43i 49	1 ⊢ (𝜑 → (𝐹‘𝑀) < (𝐹‘𝑁))

Colors of variables: wff set class

Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 ∧ w3a 978 = wceq 1353 ∈ wcel 2148 {csn 3593 class class class wbr 4004 × cxp 4625 ⟶wf 5213 ‘cfv 5217 (class class class)co 5875 ∈ cmpo 5877 ℝcr 7810 0cc0 7811 1c1 7812 + caddc 7814 < clt 7992 ≤ cle 7993 / cdiv 8629 ℕcn 8919 2c2 8970 ℤcz 9253 ℝ⁺crp 9653 seqcseq 10445

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 614 ax-in2 615 ax-io 709 ax-5 1447 ax-7 1448 ax-gen 1449 ax-ie1 1493 ax-ie2 1494 ax-8 1504 ax-10 1505 ax-11 1506 ax-i12 1507 ax-bndl 1509 ax-4 1510 ax-17 1526 ax-i9 1530 ax-ial 1534 ax-i5r 1535 ax-13 2150 ax-14 2151 ax-ext 2159 ax-coll 4119 ax-sep 4122 ax-nul 4130 ax-pow 4175 ax-pr 4210 ax-un 4434 ax-setind 4537 ax-iinf 4588 ax-cnex 7902 ax-resscn 7903 ax-1cn 7904 ax-1re 7905 ax-icn 7906 ax-addcl 7907 ax-addrcl 7908 ax-mulcl 7909 ax-mulrcl 7910 ax-addcom 7911 ax-mulcom 7912 ax-addass 7913 ax-mulass 7914 ax-distr 7915 ax-i2m1 7916 ax-0lt1 7917 ax-1rid 7918 ax-0id 7919 ax-rnegex 7920 ax-precex 7921 ax-cnre 7922 ax-pre-ltirr 7923 ax-pre-ltwlin 7924 ax-pre-lttrn 7925 ax-pre-apti 7926 ax-pre-ltadd 7927 ax-pre-mulgt0 7928 ax-pre-mulext 7929

This theorem depends on definitions: df-bi 117 df-dc 835 df-3or 979 df-3an 980 df-tru 1356 df-fal 1359 df-nf 1461 df-sb 1763 df-eu 2029 df-mo 2030 df-clab 2164 df-cleq 2170 df-clel 2173 df-nfc 2308 df-ne 2348 df-nel 2443 df-ral 2460 df-rex 2461 df-reu 2462 df-rmo 2463 df-rab 2464 df-v 2740 df-sbc 2964 df-csb 3059 df-dif 3132 df-un 3134 df-in 3136 df-ss 3143 df-nul 3424 df-if 3536 df-pw 3578 df-sn 3599 df-pr 3600 df-op 3602 df-uni 3811 df-int 3846 df-iun 3889 df-br 4005 df-opab 4066 df-mpt 4067 df-tr 4103 df-id 4294 df-po 4297 df-iso 4298 df-iord 4367 df-on 4369 df-ilim 4370 df-suc 4372 df-iom 4591 df-xp 4633 df-rel 4634 df-cnv 4635 df-co 4636 df-dm 4637 df-rn 4638 df-res 4639 df-ima 4640 df-iota 5179 df-fun 5219 df-fn 5220 df-f 5221 df-f1 5222 df-fo 5223 df-f1o 5224 df-fv 5225 df-riota 5831 df-ov 5878 df-oprab 5879 df-mpo 5880 df-1st 6141 df-2nd 6142 df-recs 6306 df-frec 6392 df-pnf 7994 df-mnf 7995 df-xr 7996 df-ltxr 7997 df-le 7998 df-sub 8130 df-neg 8131 df-reap 8532 df-ap 8539 df-div 8630 df-inn 8920 df-2 8978 df-3 8979 df-4 8980 df-n0 9177 df-z 9254 df-uz 9529 df-rp 9654 df-seqfrec 10446 df-exp 10520

This theorem is referenced by: resqrexlemnm 11027 resqrexlemcvg 11028 resqrexlemoverl 11030 resqrexlemglsq 11031

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