Theorem monoord2 10872

Description: Ordering relation for a monotonic sequence, decreasing case. (Contributed by Mario Carneiro, 18-Jul-2014.)

Hypotheses

Ref	Expression
monoord2.1	⊢ (𝜑 → 𝑁 ∈ (ℤ≥‘𝑀))
monoord2.2	⊢ ((𝜑 ∧ 𝑘 ∈ (𝑀...𝑁)) → (𝐹‘𝑘) ∈ ℝ)
monoord2.3	⊢ ((𝜑 ∧ 𝑘 ∈ (𝑀...(𝑁 − 1))) → (𝐹‘(𝑘 + 1)) ≤ (𝐹‘𝑘))

Assertion

Ref	Expression
monoord2	⊢ (𝜑 → (𝐹‘𝑁) ≤ (𝐹‘𝑀))

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

Proof of Theorem monoord2

Dummy variable 𝑛 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		monoord2.1	. . . 4 ⊢ (𝜑 → 𝑁 ∈ (ℤ≥‘𝑀))
2		monoord2.2	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ (𝑀...𝑁)) → (𝐹‘𝑘) ∈ ℝ)
3	2	renegcld 8670	. . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ (𝑀...𝑁)) → -(𝐹‘𝑘) ∈ ℝ)
4		eqid 2234	. . . . . 6 ⊢ (𝑘 ∈ (𝑀...𝑁) ↦ -(𝐹‘𝑘)) = (𝑘 ∈ (𝑀...𝑁) ↦ -(𝐹‘𝑘))
5	3, 4	fmptd 5836	. . . . 5 ⊢ (𝜑 → (𝑘 ∈ (𝑀...𝑁) ↦ -(𝐹‘𝑘)):(𝑀...𝑁)⟶ℝ)
6	5	ffvelcdmda 5817	. . . 4 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...𝑁)) → ((𝑘 ∈ (𝑀...𝑁) ↦ -(𝐹‘𝑘))‘𝑛) ∈ ℝ)
7		monoord2.3	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ (𝑀...(𝑁 − 1))) → (𝐹‘(𝑘 + 1)) ≤ (𝐹‘𝑘))
8	7	ralrimiva 2617	. . . . . . . 8 ⊢ (𝜑 → ∀𝑘 ∈ (𝑀...(𝑁 − 1))(𝐹‘(𝑘 + 1)) ≤ (𝐹‘𝑘))
9		oveq1 6065	. . . . . . . . . . 11 ⊢ (𝑘 = 𝑛 → (𝑘 + 1) = (𝑛 + 1))
10	9	fveq2d 5679	. . . . . . . . . 10 ⊢ (𝑘 = 𝑛 → (𝐹‘(𝑘 + 1)) = (𝐹‘(𝑛 + 1)))
11		fveq2 5675	. . . . . . . . . 10 ⊢ (𝑘 = 𝑛 → (𝐹‘𝑘) = (𝐹‘𝑛))
12	10, 11	breq12d 4127	. . . . . . . . 9 ⊢ (𝑘 = 𝑛 → ((𝐹‘(𝑘 + 1)) ≤ (𝐹‘𝑘) ↔ (𝐹‘(𝑛 + 1)) ≤ (𝐹‘𝑛)))
13	12	cbvralv 2780	. . . . . . . 8 ⊢ (∀𝑘 ∈ (𝑀...(𝑁 − 1))(𝐹‘(𝑘 + 1)) ≤ (𝐹‘𝑘) ↔ ∀𝑛 ∈ (𝑀...(𝑁 − 1))(𝐹‘(𝑛 + 1)) ≤ (𝐹‘𝑛))
14	8, 13	sylib 122	. . . . . . 7 ⊢ (𝜑 → ∀𝑛 ∈ (𝑀...(𝑁 − 1))(𝐹‘(𝑛 + 1)) ≤ (𝐹‘𝑛))
15	14	r19.21bi 2632	. . . . . 6 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...(𝑁 − 1))) → (𝐹‘(𝑛 + 1)) ≤ (𝐹‘𝑛))
16		fveq2 5675	. . . . . . . . 9 ⊢ (𝑘 = (𝑛 + 1) → (𝐹‘𝑘) = (𝐹‘(𝑛 + 1)))
17	16	eleq1d 2303	. . . . . . . 8 ⊢ (𝑘 = (𝑛 + 1) → ((𝐹‘𝑘) ∈ ℝ ↔ (𝐹‘(𝑛 + 1)) ∈ ℝ))
18	2	ralrimiva 2617	. . . . . . . . 9 ⊢ (𝜑 → ∀𝑘 ∈ (𝑀...𝑁)(𝐹‘𝑘) ∈ ℝ)
19	18	adantr 276	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...(𝑁 − 1))) → ∀𝑘 ∈ (𝑀...𝑁)(𝐹‘𝑘) ∈ ℝ)
20		fzp1elp1 10431	. . . . . . . . . 10 ⊢ (𝑛 ∈ (𝑀...(𝑁 − 1)) → (𝑛 + 1) ∈ (𝑀...((𝑁 − 1) + 1)))
21	20	adantl 277	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...(𝑁 − 1))) → (𝑛 + 1) ∈ (𝑀...((𝑁 − 1) + 1)))
22		eluzelz 9881	. . . . . . . . . . . . . 14 ⊢ (𝑁 ∈ (ℤ≥‘𝑀) → 𝑁 ∈ ℤ)
23	1, 22	syl 14	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑁 ∈ ℤ)
24	23	zcnd 9719	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝑁 ∈ ℂ)
25		ax-1cn 8236	. . . . . . . . . . . 12 ⊢ 1 ∈ ℂ
26		npcan 8498	. . . . . . . . . . . 12 ⊢ ((𝑁 ∈ ℂ ∧ 1 ∈ ℂ) → ((𝑁 − 1) + 1) = 𝑁)
27	24, 25, 26	sylancl 413	. . . . . . . . . . 11 ⊢ (𝜑 → ((𝑁 − 1) + 1) = 𝑁)
28	27	oveq2d 6074	. . . . . . . . . 10 ⊢ (𝜑 → (𝑀...((𝑁 − 1) + 1)) = (𝑀...𝑁))
29	28	adantr 276	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...(𝑁 − 1))) → (𝑀...((𝑁 − 1) + 1)) = (𝑀...𝑁))
30	21, 29	eleqtrd 2313	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...(𝑁 − 1))) → (𝑛 + 1) ∈ (𝑀...𝑁))
31	17, 19, 30	rspcdva 2928	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...(𝑁 − 1))) → (𝐹‘(𝑛 + 1)) ∈ ℝ)
32	11	eleq1d 2303	. . . . . . . 8 ⊢ (𝑘 = 𝑛 → ((𝐹‘𝑘) ∈ ℝ ↔ (𝐹‘𝑛) ∈ ℝ))
33		fzssp1 10422	. . . . . . . . . 10 ⊢ (𝑀...(𝑁 − 1)) ⊆ (𝑀...((𝑁 − 1) + 1))
34	33, 28	sseqtrid 3292	. . . . . . . . 9 ⊢ (𝜑 → (𝑀...(𝑁 − 1)) ⊆ (𝑀...𝑁))
35	34	sselda 3242	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...(𝑁 − 1))) → 𝑛 ∈ (𝑀...𝑁))
36	32, 19, 35	rspcdva 2928	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...(𝑁 − 1))) → (𝐹‘𝑛) ∈ ℝ)
37	31, 36	lenegd 8815	. . . . . 6 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...(𝑁 − 1))) → ((𝐹‘(𝑛 + 1)) ≤ (𝐹‘𝑛) ↔ -(𝐹‘𝑛) ≤ -(𝐹‘(𝑛 + 1))))
38	15, 37	mpbid 147	. . . . 5 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...(𝑁 − 1))) → -(𝐹‘𝑛) ≤ -(𝐹‘(𝑛 + 1)))
39	36	renegcld 8670	. . . . . 6 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...(𝑁 − 1))) → -(𝐹‘𝑛) ∈ ℝ)
40	11	negeqd 8484	. . . . . . 7 ⊢ (𝑘 = 𝑛 → -(𝐹‘𝑘) = -(𝐹‘𝑛))
41	40, 4	fvmptg 5758	. . . . . 6 ⊢ ((𝑛 ∈ (𝑀...𝑁) ∧ -(𝐹‘𝑛) ∈ ℝ) → ((𝑘 ∈ (𝑀...𝑁) ↦ -(𝐹‘𝑘))‘𝑛) = -(𝐹‘𝑛))
42	35, 39, 41	syl2anc 411	. . . . 5 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...(𝑁 − 1))) → ((𝑘 ∈ (𝑀...𝑁) ↦ -(𝐹‘𝑘))‘𝑛) = -(𝐹‘𝑛))
43	31	renegcld 8670	. . . . . 6 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...(𝑁 − 1))) → -(𝐹‘(𝑛 + 1)) ∈ ℝ)
44	16	negeqd 8484	. . . . . . 7 ⊢ (𝑘 = (𝑛 + 1) → -(𝐹‘𝑘) = -(𝐹‘(𝑛 + 1)))
45	44, 4	fvmptg 5758	. . . . . 6 ⊢ (((𝑛 + 1) ∈ (𝑀...𝑁) ∧ -(𝐹‘(𝑛 + 1)) ∈ ℝ) → ((𝑘 ∈ (𝑀...𝑁) ↦ -(𝐹‘𝑘))‘(𝑛 + 1)) = -(𝐹‘(𝑛 + 1)))
46	30, 43, 45	syl2anc 411	. . . . 5 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...(𝑁 − 1))) → ((𝑘 ∈ (𝑀...𝑁) ↦ -(𝐹‘𝑘))‘(𝑛 + 1)) = -(𝐹‘(𝑛 + 1)))
47	38, 42, 46	3brtr4d 4146	. . . 4 ⊢ ((𝜑 ∧ 𝑛 ∈ (𝑀...(𝑁 − 1))) → ((𝑘 ∈ (𝑀...𝑁) ↦ -(𝐹‘𝑘))‘𝑛) ≤ ((𝑘 ∈ (𝑀...𝑁) ↦ -(𝐹‘𝑘))‘(𝑛 + 1)))
48	1, 6, 47	monoord 10871	. . 3 ⊢ (𝜑 → ((𝑘 ∈ (𝑀...𝑁) ↦ -(𝐹‘𝑘))‘𝑀) ≤ ((𝑘 ∈ (𝑀...𝑁) ↦ -(𝐹‘𝑘))‘𝑁))
49		eluzfz1 10385	. . . . 5 ⊢ (𝑁 ∈ (ℤ≥‘𝑀) → 𝑀 ∈ (𝑀...𝑁))
50	1, 49	syl 14	. . . 4 ⊢ (𝜑 → 𝑀 ∈ (𝑀...𝑁))
51		fveq2 5675	. . . . . . 7 ⊢ (𝑘 = 𝑀 → (𝐹‘𝑘) = (𝐹‘𝑀))
52	51	eleq1d 2303	. . . . . 6 ⊢ (𝑘 = 𝑀 → ((𝐹‘𝑘) ∈ ℝ ↔ (𝐹‘𝑀) ∈ ℝ))
53	52, 18, 50	rspcdva 2928	. . . . 5 ⊢ (𝜑 → (𝐹‘𝑀) ∈ ℝ)
54	53	renegcld 8670	. . . 4 ⊢ (𝜑 → -(𝐹‘𝑀) ∈ ℝ)
55	51	negeqd 8484	. . . . 5 ⊢ (𝑘 = 𝑀 → -(𝐹‘𝑘) = -(𝐹‘𝑀))
56	55, 4	fvmptg 5758	. . . 4 ⊢ ((𝑀 ∈ (𝑀...𝑁) ∧ -(𝐹‘𝑀) ∈ ℝ) → ((𝑘 ∈ (𝑀...𝑁) ↦ -(𝐹‘𝑘))‘𝑀) = -(𝐹‘𝑀))
57	50, 54, 56	syl2anc 411	. . 3 ⊢ (𝜑 → ((𝑘 ∈ (𝑀...𝑁) ↦ -(𝐹‘𝑘))‘𝑀) = -(𝐹‘𝑀))
58		eluzfz2 10386	. . . . 5 ⊢ (𝑁 ∈ (ℤ≥‘𝑀) → 𝑁 ∈ (𝑀...𝑁))
59	1, 58	syl 14	. . . 4 ⊢ (𝜑 → 𝑁 ∈ (𝑀...𝑁))
60		fveq2 5675	. . . . . . 7 ⊢ (𝑘 = 𝑁 → (𝐹‘𝑘) = (𝐹‘𝑁))
61	60	eleq1d 2303	. . . . . 6 ⊢ (𝑘 = 𝑁 → ((𝐹‘𝑘) ∈ ℝ ↔ (𝐹‘𝑁) ∈ ℝ))
62	61, 18, 59	rspcdva 2928	. . . . 5 ⊢ (𝜑 → (𝐹‘𝑁) ∈ ℝ)
63	62	renegcld 8670	. . . 4 ⊢ (𝜑 → -(𝐹‘𝑁) ∈ ℝ)
64	60	negeqd 8484	. . . . 5 ⊢ (𝑘 = 𝑁 → -(𝐹‘𝑘) = -(𝐹‘𝑁))
65	64, 4	fvmptg 5758	. . . 4 ⊢ ((𝑁 ∈ (𝑀...𝑁) ∧ -(𝐹‘𝑁) ∈ ℝ) → ((𝑘 ∈ (𝑀...𝑁) ↦ -(𝐹‘𝑘))‘𝑁) = -(𝐹‘𝑁))
66	59, 63, 65	syl2anc 411	. . 3 ⊢ (𝜑 → ((𝑘 ∈ (𝑀...𝑁) ↦ -(𝐹‘𝑘))‘𝑁) = -(𝐹‘𝑁))
67	48, 57, 66	3brtr3d 4145	. 2 ⊢ (𝜑 → -(𝐹‘𝑀) ≤ -(𝐹‘𝑁))
68	62, 53	lenegd 8815	. 2 ⊢ (𝜑 → ((𝐹‘𝑁) ≤ (𝐹‘𝑀) ↔ -(𝐹‘𝑀) ≤ -(𝐹‘𝑁)))
69	67, 68	mpbird 167	1 ⊢ (𝜑 → (𝐹‘𝑁) ≤ (𝐹‘𝑀))

Syntax hints:   → wi 4   ∧ wa 104   = wceq 1398   ∈ wcel 2205  ∀wral 2522   class class class wbr 4114   ↦ cmpt 4176  ‘cfv 5357  (class class class)co 6058  ℂcc 8141  ℝcr 8142  1c1 8144   + caddc 8146   ≤ cle 8325   − cmin 8460  -cneg 8461  ℤcz 9594  ℤ_≥cuz 9871  ...cfz 10361

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 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2207  ax-14 2208  ax-ext 2216  ax-sep 4233  ax-pow 4292  ax-pr 4327  ax-un 4559  ax-setind 4664  ax-cnex 8234  ax-resscn 8235  ax-1cn 8236  ax-1re 8237  ax-icn 8238  ax-addcl 8239  ax-addrcl 8240  ax-mulcl 8241  ax-addcom 8243  ax-addass 8245  ax-distr 8247  ax-i2m1 8248  ax-0lt1 8249  ax-0id 8251  ax-rnegex 8252  ax-cnre 8254  ax-pre-ltirr 8255  ax-pre-ltwlin 8256  ax-pre-lttrn 8257  ax-pre-ltadd 8259

This theorem depends on definitions:  df-bi 117  df-3or 1006  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-nel 2510  df-ral 2527  df-rex 2528  df-reu 2529  df-rab 2531  df-v 2817  df-sbc 3046  df-dif 3216  df-un 3218  df-in 3220  df-ss 3227  df-pw 3676  df-sn 3700  df-pr 3701  df-op 3703  df-uni 3920  df-int 3955  df-br 4115  df-opab 4177  df-mpt 4178  df-id 4419  df-xp 4760  df-rel 4761  df-cnv 4762  df-co 4763  df-dm 4764  df-rn 4765  df-res 4766  df-ima 4767  df-iota 5317  df-fun 5359  df-fn 5360  df-f 5361  df-fv 5365  df-riota 6011  df-ov 6061  df-oprab 6062  df-mpo 6063  df-pnf 8326  df-mnf 8327  df-xr 8328  df-ltxr 8329  df-le 8330  df-sub 8462  df-neg 8463  df-inn 9255  df-n0 9514  df-z 9595  df-uz 9872  df-fz 10362

This theorem is referenced by: (None)