monoord2xrv - Mathbox for Glauco Siliprandi

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Theorem monoord2xrv 44492

Description: Ordering relation for a monotonic sequence, decreasing case. (Contributed by Glauco Siliprandi, 13-Feb-2022.)

**Hypotheses**
Ref	Expression
monoord2xrv.n	⊢ (𝜑 → 𝑁 ∈ (ℤ_≥‘𝑀))
monoord2xrv.x	⊢ ((𝜑 ∧ 𝑘 ∈ (𝑀...𝑁)) → (𝐹‘𝑘) ∈ ℝ^*)
monoord2xrv.l	⊢ ((𝜑 ∧ 𝑘 ∈ (𝑀...(𝑁 − 1))) → (𝐹‘(𝑘 + 1)) ≤ (𝐹‘𝑘))

**Assertion**
Ref	Expression
monoord2xrv	⊢ (𝜑 → (𝐹‘𝑁) ≤ (𝐹‘𝑀))

Distinct variable groups: 𝑘,𝐹 𝑘,𝑀 𝑘,𝑁 𝜑,𝑘

Proof of Theorem monoord2xrv Dummy variable 𝑛 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		monoord2xrv.n	. . . 4 ⊢ (𝜑 → 𝑁 ∈ (ℤ_≥‘𝑀))
2		monoord2xrv.x	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ (𝑀...𝑁)) → (𝐹‘𝑘) ∈ ℝ^*)
3	2	xnegcld 13283	. . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ (𝑀...𝑁)) → -_𝑒(𝐹‘𝑘) ∈ ℝ^*)
4	3	fmpttd 7115	. . . . 5 ⊢ (𝜑 → (𝑘 ∈ (𝑀...𝑁) ↦ -_𝑒(𝐹‘𝑘)):(𝑀...𝑁)⟶ℝ^*)
5	4	ffvelcdmda 7085	. . . 4 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...𝑁)) → ((𝑘 ∈ (𝑀...𝑁) ↦ -_𝑒(𝐹‘𝑘))‘𝑛) ∈ ℝ^*)
6		monoord2xrv.l	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ (𝑀...(𝑁 − 1))) → (𝐹‘(𝑘 + 1)) ≤ (𝐹‘𝑘))
7	6	ralrimiva 3144	. . . . . . . 8 ⊢ (𝜑 → ∀𝑘 ∈ (𝑀...(𝑁 − 1))(𝐹‘(𝑘 + 1)) ≤ (𝐹‘𝑘))
8		fvoveq1 7434	. . . . . . . . . 10 ⊢ (𝑘 = 𝑛 → (𝐹‘(𝑘 + 1)) = (𝐹‘(𝑛 + 1)))
9		fveq2 6890	. . . . . . . . . 10 ⊢ (𝑘 = 𝑛 → (𝐹‘𝑘) = (𝐹‘𝑛))
10	8, 9	breq12d 5160	. . . . . . . . 9 ⊢ (𝑘 = 𝑛 → ((𝐹‘(𝑘 + 1)) ≤ (𝐹‘𝑘) ↔ (𝐹‘(𝑛 + 1)) ≤ (𝐹‘𝑛)))
11	10	cbvralvw 3232	. . . . . . . 8 ⊢ (∀𝑘 ∈ (𝑀...(𝑁 − 1))(𝐹‘(𝑘 + 1)) ≤ (𝐹‘𝑘) ↔ ∀𝑛 ∈ (𝑀...(𝑁 − 1))(𝐹‘(𝑛 + 1)) ≤ (𝐹‘𝑛))
12	7, 11	sylib 217	. . . . . . 7 ⊢ (𝜑 → ∀𝑛 ∈ (𝑀...(𝑁 − 1))(𝐹‘(𝑛 + 1)) ≤ (𝐹‘𝑛))
13	12	r19.21bi 3246	. . . . . 6 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...(𝑁 − 1))) → (𝐹‘(𝑛 + 1)) ≤ (𝐹‘𝑛))
14		fzp1elp1 13558	. . . . . . . . . 10 ⊢ (𝑛 ∈ (𝑀...(𝑁 − 1)) → (𝑛 + 1) ∈ (𝑀...((𝑁 − 1) + 1)))
15	14	adantl 480	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...(𝑁 − 1))) → (𝑛 + 1) ∈ (𝑀...((𝑁 − 1) + 1)))
16		eluzelz 12836	. . . . . . . . . . . . . 14 ⊢ (𝑁 ∈ (ℤ_≥‘𝑀) → 𝑁 ∈ ℤ)
17	1, 16	syl 17	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑁 ∈ ℤ)
18	17	zcnd 12671	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝑁 ∈ ℂ)
19		ax-1cn 11170	. . . . . . . . . . . 12 ⊢ 1 ∈ ℂ
20		npcan 11473	. . . . . . . . . . . 12 ⊢ ((𝑁 ∈ ℂ ∧ 1 ∈ ℂ) → ((𝑁 − 1) + 1) = 𝑁)
21	18, 19, 20	sylancl 584	. . . . . . . . . . 11 ⊢ (𝜑 → ((𝑁 − 1) + 1) = 𝑁)
22	21	oveq2d 7427	. . . . . . . . . 10 ⊢ (𝜑 → (𝑀...((𝑁 − 1) + 1)) = (𝑀...𝑁))
23	22	adantr 479	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...(𝑁 − 1))) → (𝑀...((𝑁 − 1) + 1)) = (𝑀...𝑁))
24	15, 23	eleqtrd 2833	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...(𝑁 − 1))) → (𝑛 + 1) ∈ (𝑀...𝑁))
25	2	ralrimiva 3144	. . . . . . . . 9 ⊢ (𝜑 → ∀𝑘 ∈ (𝑀...𝑁)(𝐹‘𝑘) ∈ ℝ^*)
26	25	adantr 479	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...(𝑁 − 1))) → ∀𝑘 ∈ (𝑀...𝑁)(𝐹‘𝑘) ∈ ℝ^*)
27		fveq2 6890	. . . . . . . . . 10 ⊢ (𝑘 = (𝑛 + 1) → (𝐹‘𝑘) = (𝐹‘(𝑛 + 1)))
28	27	eleq1d 2816	. . . . . . . . 9 ⊢ (𝑘 = (𝑛 + 1) → ((𝐹‘𝑘) ∈ ℝ^* ↔ (𝐹‘(𝑛 + 1)) ∈ ℝ^*))
29	28	rspcv 3607	. . . . . . . 8 ⊢ ((𝑛 + 1) ∈ (𝑀...𝑁) → (∀𝑘 ∈ (𝑀...𝑁)(𝐹‘𝑘) ∈ ℝ^* → (𝐹‘(𝑛 + 1)) ∈ ℝ^*))
30	24, 26, 29	sylc 65	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...(𝑁 − 1))) → (𝐹‘(𝑛 + 1)) ∈ ℝ^*)
31		fzssp1 13548	. . . . . . . . . 10 ⊢ (𝑀...(𝑁 − 1)) ⊆ (𝑀...((𝑁 − 1) + 1))
32	31, 22	sseqtrid 4033	. . . . . . . . 9 ⊢ (𝜑 → (𝑀...(𝑁 − 1)) ⊆ (𝑀...𝑁))
33	32	sselda 3981	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...(𝑁 − 1))) → 𝑛 ∈ (𝑀...𝑁))
34	9	eleq1d 2816	. . . . . . . . 9 ⊢ (𝑘 = 𝑛 → ((𝐹‘𝑘) ∈ ℝ^* ↔ (𝐹‘𝑛) ∈ ℝ^*))
35	34	rspcv 3607	. . . . . . . 8 ⊢ (𝑛 ∈ (𝑀...𝑁) → (∀𝑘 ∈ (𝑀...𝑁)(𝐹‘𝑘) ∈ ℝ^* → (𝐹‘𝑛) ∈ ℝ^*))
36	33, 26, 35	sylc 65	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...(𝑁 − 1))) → (𝐹‘𝑛) ∈ ℝ^*)
37		xleneg 13201	. . . . . . 7 ⊢ (((𝐹‘(𝑛 + 1)) ∈ ℝ^* ∧ (𝐹‘𝑛) ∈ ℝ^*) → ((𝐹‘(𝑛 + 1)) ≤ (𝐹‘𝑛) ↔ -_𝑒(𝐹‘𝑛) ≤ -_𝑒(𝐹‘(𝑛 + 1))))
38	30, 36, 37	syl2anc 582	. . . . . 6 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...(𝑁 − 1))) → ((𝐹‘(𝑛 + 1)) ≤ (𝐹‘𝑛) ↔ -_𝑒(𝐹‘𝑛) ≤ -_𝑒(𝐹‘(𝑛 + 1))))
39	13, 38	mpbid 231	. . . . 5 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...(𝑁 − 1))) → -_𝑒(𝐹‘𝑛) ≤ -_𝑒(𝐹‘(𝑛 + 1)))
40	9	xnegeqd 44445	. . . . . . 7 ⊢ (𝑘 = 𝑛 → -_𝑒(𝐹‘𝑘) = -_𝑒(𝐹‘𝑛))
41		eqid 2730	. . . . . . 7 ⊢ (𝑘 ∈ (𝑀...𝑁) ↦ -_𝑒(𝐹‘𝑘)) = (𝑘 ∈ (𝑀...𝑁) ↦ -_𝑒(𝐹‘𝑘))
42		xnegex 13191	. . . . . . 7 ⊢ -_𝑒(𝐹‘𝑛) ∈ V
43	40, 41, 42	fvmpt 6997	. . . . . 6 ⊢ (𝑛 ∈ (𝑀...𝑁) → ((𝑘 ∈ (𝑀...𝑁) ↦ -_𝑒(𝐹‘𝑘))‘𝑛) = -_𝑒(𝐹‘𝑛))
44	33, 43	syl 17	. . . . 5 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...(𝑁 − 1))) → ((𝑘 ∈ (𝑀...𝑁) ↦ -_𝑒(𝐹‘𝑘))‘𝑛) = -_𝑒(𝐹‘𝑛))
45	27	xnegeqd 44445	. . . . . . 7 ⊢ (𝑘 = (𝑛 + 1) → -_𝑒(𝐹‘𝑘) = -_𝑒(𝐹‘(𝑛 + 1)))
46		xnegex 13191	. . . . . . 7 ⊢ -_𝑒(𝐹‘(𝑛 + 1)) ∈ V
47	45, 41, 46	fvmpt 6997	. . . . . 6 ⊢ ((𝑛 + 1) ∈ (𝑀...𝑁) → ((𝑘 ∈ (𝑀...𝑁) ↦ -_𝑒(𝐹‘𝑘))‘(𝑛 + 1)) = -_𝑒(𝐹‘(𝑛 + 1)))
48	24, 47	syl 17	. . . . 5 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...(𝑁 − 1))) → ((𝑘 ∈ (𝑀...𝑁) ↦ -_𝑒(𝐹‘𝑘))‘(𝑛 + 1)) = -_𝑒(𝐹‘(𝑛 + 1)))
49	39, 44, 48	3brtr4d 5179	. . . 4 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...(𝑁 − 1))) → ((𝑘 ∈ (𝑀...𝑁) ↦ -_𝑒(𝐹‘𝑘))‘𝑛) ≤ ((𝑘 ∈ (𝑀...𝑁) ↦ -_𝑒(𝐹‘𝑘))‘(𝑛 + 1)))
50	1, 5, 49	monoordxrv 44490	. . 3 ⊢ (𝜑 → ((𝑘 ∈ (𝑀...𝑁) ↦ -_𝑒(𝐹‘𝑘))‘𝑀) ≤ ((𝑘 ∈ (𝑀...𝑁) ↦ -_𝑒(𝐹‘𝑘))‘𝑁))
51		eluzfz1 13512	. . . . 5 ⊢ (𝑁 ∈ (ℤ_≥‘𝑀) → 𝑀 ∈ (𝑀...𝑁))
52	1, 51	syl 17	. . . 4 ⊢ (𝜑 → 𝑀 ∈ (𝑀...𝑁))
53		fveq2 6890	. . . . . 6 ⊢ (𝑘 = 𝑀 → (𝐹‘𝑘) = (𝐹‘𝑀))
54	53	xnegeqd 44445	. . . . 5 ⊢ (𝑘 = 𝑀 → -_𝑒(𝐹‘𝑘) = -_𝑒(𝐹‘𝑀))
55		xnegex 13191	. . . . 5 ⊢ -_𝑒(𝐹‘𝑀) ∈ V
56	54, 41, 55	fvmpt 6997	. . . 4 ⊢ (𝑀 ∈ (𝑀...𝑁) → ((𝑘 ∈ (𝑀...𝑁) ↦ -_𝑒(𝐹‘𝑘))‘𝑀) = -_𝑒(𝐹‘𝑀))
57	52, 56	syl 17	. . 3 ⊢ (𝜑 → ((𝑘 ∈ (𝑀...𝑁) ↦ -_𝑒(𝐹‘𝑘))‘𝑀) = -_𝑒(𝐹‘𝑀))
58		eluzfz2 13513	. . . . 5 ⊢ (𝑁 ∈ (ℤ_≥‘𝑀) → 𝑁 ∈ (𝑀...𝑁))
59	1, 58	syl 17	. . . 4 ⊢ (𝜑 → 𝑁 ∈ (𝑀...𝑁))
60		fveq2 6890	. . . . . 6 ⊢ (𝑘 = 𝑁 → (𝐹‘𝑘) = (𝐹‘𝑁))
61	60	xnegeqd 44445	. . . . 5 ⊢ (𝑘 = 𝑁 → -_𝑒(𝐹‘𝑘) = -_𝑒(𝐹‘𝑁))
62		xnegex 13191	. . . . 5 ⊢ -_𝑒(𝐹‘𝑁) ∈ V
63	61, 41, 62	fvmpt 6997	. . . 4 ⊢ (𝑁 ∈ (𝑀...𝑁) → ((𝑘 ∈ (𝑀...𝑁) ↦ -_𝑒(𝐹‘𝑘))‘𝑁) = -_𝑒(𝐹‘𝑁))
64	59, 63	syl 17	. . 3 ⊢ (𝜑 → ((𝑘 ∈ (𝑀...𝑁) ↦ -_𝑒(𝐹‘𝑘))‘𝑁) = -_𝑒(𝐹‘𝑁))
65	50, 57, 64	3brtr3d 5178	. 2 ⊢ (𝜑 → -_𝑒(𝐹‘𝑀) ≤ -_𝑒(𝐹‘𝑁))
66	60	eleq1d 2816	. . . . 5 ⊢ (𝑘 = 𝑁 → ((𝐹‘𝑘) ∈ ℝ^* ↔ (𝐹‘𝑁) ∈ ℝ^*))
67	66	rspcv 3607	. . . 4 ⊢ (𝑁 ∈ (𝑀...𝑁) → (∀𝑘 ∈ (𝑀...𝑁)(𝐹‘𝑘) ∈ ℝ^* → (𝐹‘𝑁) ∈ ℝ^*))
68	59, 25, 67	sylc 65	. . 3 ⊢ (𝜑 → (𝐹‘𝑁) ∈ ℝ^*)
69	53	eleq1d 2816	. . . . 5 ⊢ (𝑘 = 𝑀 → ((𝐹‘𝑘) ∈ ℝ^* ↔ (𝐹‘𝑀) ∈ ℝ^*))
70	69	rspcv 3607	. . . 4 ⊢ (𝑀 ∈ (𝑀...𝑁) → (∀𝑘 ∈ (𝑀...𝑁)(𝐹‘𝑘) ∈ ℝ^* → (𝐹‘𝑀) ∈ ℝ^*))
71	52, 25, 70	sylc 65	. . 3 ⊢ (𝜑 → (𝐹‘𝑀) ∈ ℝ^*)
72		xleneg 13201	. . 3 ⊢ (((𝐹‘𝑁) ∈ ℝ^* ∧ (𝐹‘𝑀) ∈ ℝ^*) → ((𝐹‘𝑁) ≤ (𝐹‘𝑀) ↔ -_𝑒(𝐹‘𝑀) ≤ -_𝑒(𝐹‘𝑁)))
73	68, 71, 72	syl2anc 582	. 2 ⊢ (𝜑 → ((𝐹‘𝑁) ≤ (𝐹‘𝑀) ↔ -_𝑒(𝐹‘𝑀) ≤ -_𝑒(𝐹‘𝑁)))
74	65, 73	mpbird 256	1 ⊢ (𝜑 → (𝐹‘𝑁) ≤ (𝐹‘𝑀))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 394 = wceq 1539 ∈ wcel 2104 ∀wral 3059 class class class wbr 5147 ↦ cmpt 5230 ‘cfv 6542 (class class class)co 7411 ℂcc 11110 1c1 11113 + caddc 11115 ℝ^*cxr 11251 ≤ cle 11253 − cmin 11448 ℤcz 12562 ℤ_≥cuz 12826 -_𝑒cxne 13093 ...cfz 13488

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1911 ax-6 1969 ax-7 2009 ax-8 2106 ax-9 2114 ax-10 2135 ax-11 2152 ax-12 2169 ax-ext 2701 ax-sep 5298 ax-nul 5305 ax-pow 5362 ax-pr 5426 ax-un 7727 ax-cnex 11168 ax-resscn 11169 ax-1cn 11170 ax-icn 11171 ax-addcl 11172 ax-addrcl 11173 ax-mulcl 11174 ax-mulrcl 11175 ax-mulcom 11176 ax-addass 11177 ax-mulass 11178 ax-distr 11179 ax-i2m1 11180 ax-1ne0 11181 ax-1rid 11182 ax-rnegex 11183 ax-rrecex 11184 ax-cnre 11185 ax-pre-lttri 11186 ax-pre-lttrn 11187 ax-pre-ltadd 11188 ax-pre-mulgt0 11189

This theorem depends on definitions: df-bi 206 df-an 395 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2532 df-eu 2561 df-clab 2708 df-cleq 2722 df-clel 2808 df-nfc 2883 df-ne 2939 df-nel 3045 df-ral 3060 df-rex 3069 df-reu 3375 df-rab 3431 df-v 3474 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4322 df-if 4528 df-pw 4603 df-sn 4628 df-pr 4630 df-op 4634 df-uni 4908 df-iun 4998 df-br 5148 df-opab 5210 df-mpt 5231 df-tr 5265 df-id 5573 df-eprel 5579 df-po 5587 df-so 5588 df-fr 5630 df-we 5632 df-xp 5681 df-rel 5682 df-cnv 5683 df-co 5684 df-dm 5685 df-rn 5686 df-res 5687 df-ima 5688 df-pred 6299 df-ord 6366 df-on 6367 df-lim 6368 df-suc 6369 df-iota 6494 df-fun 6544 df-fn 6545 df-f 6546 df-f1 6547 df-fo 6548 df-f1o 6549 df-fv 6550 df-riota 7367 df-ov 7414 df-oprab 7415 df-mpo 7416 df-om 7858 df-1st 7977 df-2nd 7978 df-frecs 8268 df-wrecs 8299 df-recs 8373 df-rdg 8412 df-er 8705 df-en 8942 df-dom 8943 df-sdom 8944 df-pnf 11254 df-mnf 11255 df-xr 11256 df-ltxr 11257 df-le 11258 df-sub 11450 df-neg 11451 df-nn 12217 df-n0 12477 df-z 12563 df-uz 12827 df-xneg 13096 df-fz 13489

This theorem is referenced by: monoord2xr 44493

W3C validator