resqrexlemdecn - Intuitionistic Logic Explorer

	Intuitionistic Logic Explorer		< Previous Next > Nearby theorems
Mirrors > Home > ILE Home > Th. List > resqrexlemdecn		GIF version

Theorem resqrexlemdecn 11023

Description: Lemma for resqrex 11037. 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 9376	. . . 4 ⊢ (𝜑 → 𝑁 ∈ ℤ)
3	2	peano2zd 9380	. . 3 ⊢ (𝜑 → (𝑁 + 1) ∈ ℤ)
4		resqrexlemdecn.m	. . . 4 ⊢ (𝜑 → 𝑀 ∈ ℕ)
5	4	nnzd 9376	. . 3 ⊢ (𝜑 → 𝑀 ∈ ℤ)
6		resqrexlemdecn.nm	. . . 4 ⊢ (𝜑 → 𝑁 < 𝑀)
7		nnltp1le 9315	. . . . 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 5517	. . . . . 6 ⊢ (𝑤 = (𝑁 + 1) → (𝐹‘𝑤) = (𝐹‘(𝑁 + 1)))
11	10	breq1d 4015	. . . . 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 5517	. . . . . 6 ⊢ (𝑤 = 𝑘 → (𝐹‘𝑤) = (𝐹‘𝑘))
14	13	breq1d 4015	. . . . 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 5517	. . . . . 6 ⊢ (𝑤 = (𝑘 + 1) → (𝐹‘𝑤) = (𝐹‘(𝑘 + 1)))
17	16	breq1d 4015	. . . . 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 5517	. . . . . 6 ⊢ (𝑤 = 𝑀 → (𝐹‘𝑤) = (𝐹‘𝑀))
20	19	breq1d 4015	. . . . 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 11022	. . . . . 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 11018	. . . . . . . . . . 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 7974	. . . . . . . . . . . . 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 9377	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → (𝑁 + 1) ∈ ℝ)
34	30	zred 9377	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → 𝑘 ∈ ℝ)
35	1	nnred 8934	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → 𝑁 ∈ ℝ)
36	1	nngt0d 8965	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → 0 < 𝑁)
37		0re 7959	. . . . . . . . . . . . . . . . 17 ⊢ 0 ∈ ℝ
38		ltle 8047	. . . . . . . . . . . . . . . . 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 7974	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → 1 ∈ ℝ)
42	41, 35	addge02d 8493	. . . . . . . . . . . . . . 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 8083	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → 1 ≤ 𝑘)
47		elnnz1 9278	. . . . . . . . . . . 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 8936	. . . . . . . . . 10 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → (𝑘 + 1) ∈ ℕ)
50	29, 49	ffvelcdmd 5654	. . . . . . . . 9 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → (𝐹‘(𝑘 + 1)) ∈ ℝ⁺)
51	50	rpred 9698	. . . . . . . 8 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → (𝐹‘(𝑘 + 1)) ∈ ℝ)
52	29, 48	ffvelcdmd 5654	. . . . . . . . 9 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → (𝐹‘𝑘) ∈ ℝ⁺)
53	52	rpred 9698	. . . . . . . 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 5654	. . . . . . . . 9 ⊢ (((𝜑 ∧ ((𝑁 + 1) ∈ ℤ ∧ 𝑘 ∈ ℤ ∧ (𝑁 + 1) ≤ 𝑘)) ∧ (𝐹‘𝑘) < (𝐹‘𝑁)) → (𝐹‘𝑁) ∈ ℝ⁺)
56	55	rpred 9698	. . . . . . . 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 11022	. . . . . . . . 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 8085	. . . . . . 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 9366	. . 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 3594 class class class wbr 4005 × cxp 4626 ⟶wf 5214 ‘cfv 5218 (class class class)co 5877 ∈ cmpo 5879 ℝcr 7812 0cc0 7813 1c1 7814 + caddc 7816 < clt 7994 ≤ cle 7995 / cdiv 8631 ℕcn 8921 2c2 8972 ℤcz 9255 ℝ⁺crp 9655 seqcseq 10447

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 4120 ax-sep 4123 ax-nul 4131 ax-pow 4176 ax-pr 4211 ax-un 4435 ax-setind 4538 ax-iinf 4589 ax-cnex 7904 ax-resscn 7905 ax-1cn 7906 ax-1re 7907 ax-icn 7908 ax-addcl 7909 ax-addrcl 7910 ax-mulcl 7911 ax-mulrcl 7912 ax-addcom 7913 ax-mulcom 7914 ax-addass 7915 ax-mulass 7916 ax-distr 7917 ax-i2m1 7918 ax-0lt1 7919 ax-1rid 7920 ax-0id 7921 ax-rnegex 7922 ax-precex 7923 ax-cnre 7924 ax-pre-ltirr 7925 ax-pre-ltwlin 7926 ax-pre-lttrn 7927 ax-pre-apti 7928 ax-pre-ltadd 7929 ax-pre-mulgt0 7930 ax-pre-mulext 7931

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 2741 df-sbc 2965 df-csb 3060 df-dif 3133 df-un 3135 df-in 3137 df-ss 3144 df-nul 3425 df-if 3537 df-pw 3579 df-sn 3600 df-pr 3601 df-op 3603 df-uni 3812 df-int 3847 df-iun 3890 df-br 4006 df-opab 4067 df-mpt 4068 df-tr 4104 df-id 4295 df-po 4298 df-iso 4299 df-iord 4368 df-on 4370 df-ilim 4371 df-suc 4373 df-iom 4592 df-xp 4634 df-rel 4635 df-cnv 4636 df-co 4637 df-dm 4638 df-rn 4639 df-res 4640 df-ima 4641 df-iota 5180 df-fun 5220 df-fn 5221 df-f 5222 df-f1 5223 df-fo 5224 df-f1o 5225 df-fv 5226 df-riota 5833 df-ov 5880 df-oprab 5881 df-mpo 5882 df-1st 6143 df-2nd 6144 df-recs 6308 df-frec 6394 df-pnf 7996 df-mnf 7997 df-xr 7998 df-ltxr 7999 df-le 8000 df-sub 8132 df-neg 8133 df-reap 8534 df-ap 8541 df-div 8632 df-inn 8922 df-2 8980 df-3 8981 df-4 8982 df-n0 9179 df-z 9256 df-uz 9531 df-rp 9656 df-seqfrec 10448 df-exp 10522

This theorem is referenced by: resqrexlemnm 11029 resqrexlemcvg 11030 resqrexlemoverl 11032 resqrexlemglsq 11033

W3C validator