imo72b2lem0 - Mathbox for Stanislas Polu

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Theorem imo72b2lem0 43589

Description: Lemma for imo72b2 43596. (Contributed by Stanislas Polu, 9-Mar-2020.)

**Hypotheses**
Ref	Expression
imo72b2lem0.1	⊢ (𝜑 → 𝐹:ℝ⟶ℝ)
imo72b2lem0.2	⊢ (𝜑 → 𝐺:ℝ⟶ℝ)
imo72b2lem0.3	⊢ (𝜑 → 𝐴 ∈ ℝ)
imo72b2lem0.4	⊢ (𝜑 → 𝐵 ∈ ℝ)
imo72b2lem0.5	⊢ (𝜑 → ((𝐹‘(𝐴 + 𝐵)) + (𝐹‘(𝐴 − 𝐵))) = (2 · ((𝐹‘𝐴) · (𝐺‘𝐵))))
imo72b2lem0.6	⊢ (𝜑 → ∀𝑦 ∈ ℝ (abs‘(𝐹‘𝑦)) ≤ 1)

**Assertion**
Ref	Expression
imo72b2lem0	⊢ (𝜑 → ((abs‘(𝐹‘𝐴)) · (abs‘(𝐺‘𝐵))) ≤ sup((abs “ (𝐹 “ ℝ)), ℝ, < ))

Distinct variable groups: 𝑦,𝐹 𝜑,𝑦 Allowed substitution hints: 𝐴(𝑦) 𝐵(𝑦) 𝐺(𝑦)

Proof of Theorem imo72b2lem0 Dummy variables 𝑐 𝑥 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		imo72b2lem0.1	. . . . . . . 8 ⊢ (𝜑 → 𝐹:ℝ⟶ℝ)
2		imo72b2lem0.3	. . . . . . . 8 ⊢ (𝜑 → 𝐴 ∈ ℝ)
3	1, 2	ffvelcdmd 7089	. . . . . . 7 ⊢ (𝜑 → (𝐹‘𝐴) ∈ ℝ)
4	3	recnd 11266	. . . . . 6 ⊢ (𝜑 → (𝐹‘𝐴) ∈ ℂ)
5	4	idi 1	. . . . 5 ⊢ (𝜑 → (𝐹‘𝐴) ∈ ℂ)
6		imo72b2lem0.2	. . . . . . . 8 ⊢ (𝜑 → 𝐺:ℝ⟶ℝ)
7		imo72b2lem0.4	. . . . . . . 8 ⊢ (𝜑 → 𝐵 ∈ ℝ)
8	6, 7	ffvelcdmd 7089	. . . . . . 7 ⊢ (𝜑 → (𝐺‘𝐵) ∈ ℝ)
9	8	recnd 11266	. . . . . 6 ⊢ (𝜑 → (𝐺‘𝐵) ∈ ℂ)
10	9	idi 1	. . . . 5 ⊢ (𝜑 → (𝐺‘𝐵) ∈ ℂ)
11	5, 10	mulcld 11258	. . . 4 ⊢ (𝜑 → ((𝐹‘𝐴) · (𝐺‘𝐵)) ∈ ℂ)
12	11	abscld 15409	. . 3 ⊢ (𝜑 → (abs‘((𝐹‘𝐴) · (𝐺‘𝐵))) ∈ ℝ)
13		imaco 6249	. . . . . 6 ⊢ ((abs ∘ 𝐹) “ ℝ) = (abs “ (𝐹 “ ℝ))
14	13	eqcomi 2737	. . . . 5 ⊢ (abs “ (𝐹 “ ℝ)) = ((abs ∘ 𝐹) “ ℝ)
15		imassrn 6068	. . . . . . 7 ⊢ ((abs ∘ 𝐹) “ ℝ) ⊆ ran (abs ∘ 𝐹)
16	15	a1i 11	. . . . . 6 ⊢ (𝜑 → ((abs ∘ 𝐹) “ ℝ) ⊆ ran (abs ∘ 𝐹))
17		absf 15310	. . . . . . . . . 10 ⊢ abs:ℂ⟶ℝ
18	17	a1i 11	. . . . . . . . 9 ⊢ (𝜑 → abs:ℂ⟶ℝ)
19		ax-resscn 11189	. . . . . . . . . 10 ⊢ ℝ ⊆ ℂ
20	19	a1i 11	. . . . . . . . 9 ⊢ (𝜑 → ℝ ⊆ ℂ)
21	18, 20	fssresd 6758	. . . . . . . 8 ⊢ (𝜑 → (abs ↾ ℝ):ℝ⟶ℝ)
22	1, 21	fco2d 43586	. . . . . . 7 ⊢ (𝜑 → (abs ∘ 𝐹):ℝ⟶ℝ)
23	22	frnd 6724	. . . . . 6 ⊢ (𝜑 → ran (abs ∘ 𝐹) ⊆ ℝ)
24	16, 23	sstrd 3988	. . . . 5 ⊢ (𝜑 → ((abs ∘ 𝐹) “ ℝ) ⊆ ℝ)
25	14, 24	eqsstrid 4026	. . . 4 ⊢ (𝜑 → (abs “ (𝐹 “ ℝ)) ⊆ ℝ)
26		0re 11240	. . . . . . . . . 10 ⊢ 0 ∈ ℝ
27	26	ne0ii 4333	. . . . . . . . 9 ⊢ ℝ ≠ ∅
28	27	a1i 11	. . . . . . . 8 ⊢ (𝜑 → ℝ ≠ ∅)
29	28, 22	wnefimgd 43585	. . . . . . 7 ⊢ (𝜑 → ((abs ∘ 𝐹) “ ℝ) ≠ ∅)
30	29	necomd 2992	. . . . . 6 ⊢ (𝜑 → ∅ ≠ ((abs ∘ 𝐹) “ ℝ))
31	14	a1i 11	. . . . . 6 ⊢ (𝜑 → (abs “ (𝐹 “ ℝ)) = ((abs ∘ 𝐹) “ ℝ))
32	30, 31	neeqtrrd 3011	. . . . 5 ⊢ (𝜑 → ∅ ≠ (abs “ (𝐹 “ ℝ)))
33	32	necomd 2992	. . . 4 ⊢ (𝜑 → (abs “ (𝐹 “ ℝ)) ≠ ∅)
34		1red 11239	. . . . 5 ⊢ (𝜑 → 1 ∈ ℝ)
35		simpr 484	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑐 = 1) → 𝑐 = 1)
36	35	breq2d 5154	. . . . . 6 ⊢ ((𝜑 ∧ 𝑐 = 1) → (𝑥 ≤ 𝑐 ↔ 𝑥 ≤ 1))
37	36	ralbidv 3173	. . . . 5 ⊢ ((𝜑 ∧ 𝑐 = 1) → (∀𝑥 ∈ (abs “ (𝐹 “ ℝ))𝑥 ≤ 𝑐 ↔ ∀𝑥 ∈ (abs “ (𝐹 “ ℝ))𝑥 ≤ 1))
38		imo72b2lem0.6	. . . . . 6 ⊢ (𝜑 → ∀𝑦 ∈ ℝ (abs‘(𝐹‘𝑦)) ≤ 1)
39	1, 38	extoimad 43588	. . . . 5 ⊢ (𝜑 → ∀𝑥 ∈ (abs “ (𝐹 “ ℝ))𝑥 ≤ 1)
40	34, 37, 39	rspcedvd 3610	. . . 4 ⊢ (𝜑 → ∃𝑐 ∈ ℝ ∀𝑥 ∈ (abs “ (𝐹 “ ℝ))𝑥 ≤ 𝑐)
41	25, 33, 40	suprcld 12201	. . 3 ⊢ (𝜑 → sup((abs “ (𝐹 “ ℝ)), ℝ, < ) ∈ ℝ)
42		2re 12310	. . . 4 ⊢ 2 ∈ ℝ
43	42	a1i 11	. . 3 ⊢ (𝜑 → 2 ∈ ℝ)
44		imo72b2lem0.5	. . . . . . . . 9 ⊢ (𝜑 → ((𝐹‘(𝐴 + 𝐵)) + (𝐹‘(𝐴 − 𝐵))) = (2 · ((𝐹‘𝐴) · (𝐺‘𝐵))))
45	44	idi 1	. . . . . . . 8 ⊢ (𝜑 → ((𝐹‘(𝐴 + 𝐵)) + (𝐹‘(𝐴 − 𝐵))) = (2 · ((𝐹‘𝐴) · (𝐺‘𝐵))))
46	45	fveq2d 6895	. . . . . . 7 ⊢ (𝜑 → (abs‘((𝐹‘(𝐴 + 𝐵)) + (𝐹‘(𝐴 − 𝐵)))) = (abs‘(2 · ((𝐹‘𝐴) · (𝐺‘𝐵)))))
47		2cnd 12314	. . . . . . . . 9 ⊢ (𝜑 → 2 ∈ ℂ)
48	47, 11	mulcld 11258	. . . . . . . 8 ⊢ (𝜑 → (2 · ((𝐹‘𝐴) · (𝐺‘𝐵))) ∈ ℂ)
49	48	abscld 15409	. . . . . . 7 ⊢ (𝜑 → (abs‘(2 · ((𝐹‘𝐴) · (𝐺‘𝐵)))) ∈ ℝ)
50	46, 49	eqeltrd 2829	. . . . . 6 ⊢ (𝜑 → (abs‘((𝐹‘(𝐴 + 𝐵)) + (𝐹‘(𝐴 − 𝐵)))) ∈ ℝ)
51	1	idi 1	. . . . . . . . . 10 ⊢ (𝜑 → 𝐹:ℝ⟶ℝ)
52	2	idi 1	. . . . . . . . . . 11 ⊢ (𝜑 → 𝐴 ∈ ℝ)
53	7	idi 1	. . . . . . . . . . 11 ⊢ (𝜑 → 𝐵 ∈ ℝ)
54	52, 53	readdcld 11267	. . . . . . . . . 10 ⊢ (𝜑 → (𝐴 + 𝐵) ∈ ℝ)
55	51, 54	ffvelcdmd 7089	. . . . . . . . 9 ⊢ (𝜑 → (𝐹‘(𝐴 + 𝐵)) ∈ ℝ)
56	55	recnd 11266	. . . . . . . 8 ⊢ (𝜑 → (𝐹‘(𝐴 + 𝐵)) ∈ ℂ)
57	56	abscld 15409	. . . . . . 7 ⊢ (𝜑 → (abs‘(𝐹‘(𝐴 + 𝐵))) ∈ ℝ)
58	52, 53	resubcld 11666	. . . . . . . . . 10 ⊢ (𝜑 → (𝐴 − 𝐵) ∈ ℝ)
59	51, 58	ffvelcdmd 7089	. . . . . . . . 9 ⊢ (𝜑 → (𝐹‘(𝐴 − 𝐵)) ∈ ℝ)
60	59	recnd 11266	. . . . . . . 8 ⊢ (𝜑 → (𝐹‘(𝐴 − 𝐵)) ∈ ℂ)
61	60	abscld 15409	. . . . . . 7 ⊢ (𝜑 → (abs‘(𝐹‘(𝐴 − 𝐵))) ∈ ℝ)
62	57, 61	readdcld 11267	. . . . . 6 ⊢ (𝜑 → ((abs‘(𝐹‘(𝐴 + 𝐵))) + (abs‘(𝐹‘(𝐴 − 𝐵)))) ∈ ℝ)
63	43, 41	remulcld 11268	. . . . . 6 ⊢ (𝜑 → (2 · sup((abs “ (𝐹 “ ℝ)), ℝ, < )) ∈ ℝ)
64	56, 60	abstrid 15429	. . . . . 6 ⊢ (𝜑 → (abs‘((𝐹‘(𝐴 + 𝐵)) + (𝐹‘(𝐴 − 𝐵)))) ≤ ((abs‘(𝐹‘(𝐴 + 𝐵))) + (abs‘(𝐹‘(𝐴 − 𝐵)))))
65	1, 54	fvco3d 6992	. . . . . . . . . 10 ⊢ (𝜑 → ((abs ∘ 𝐹)‘(𝐴 + 𝐵)) = (abs‘(𝐹‘(𝐴 + 𝐵))))
66	54, 22	wfximgfd 43587	. . . . . . . . . . 11 ⊢ (𝜑 → ((abs ∘ 𝐹)‘(𝐴 + 𝐵)) ∈ ((abs ∘ 𝐹) “ ℝ))
67	31	idi 1	. . . . . . . . . . 11 ⊢ (𝜑 → (abs “ (𝐹 “ ℝ)) = ((abs ∘ 𝐹) “ ℝ))
68	66, 67	eleqtrrd 2832	. . . . . . . . . 10 ⊢ (𝜑 → ((abs ∘ 𝐹)‘(𝐴 + 𝐵)) ∈ (abs “ (𝐹 “ ℝ)))
69	65, 68	eqeltrrd 2830	. . . . . . . . 9 ⊢ (𝜑 → (abs‘(𝐹‘(𝐴 + 𝐵))) ∈ (abs “ (𝐹 “ ℝ)))
70	25, 33, 40, 69	suprubd 12200	. . . . . . . 8 ⊢ (𝜑 → (abs‘(𝐹‘(𝐴 + 𝐵))) ≤ sup((abs “ (𝐹 “ ℝ)), ℝ, < ))
71	1, 58	fvco3d 6992	. . . . . . . . . 10 ⊢ (𝜑 → ((abs ∘ 𝐹)‘(𝐴 − 𝐵)) = (abs‘(𝐹‘(𝐴 − 𝐵))))
72	58, 22	wfximgfd 43587	. . . . . . . . . . 11 ⊢ (𝜑 → ((abs ∘ 𝐹)‘(𝐴 − 𝐵)) ∈ ((abs ∘ 𝐹) “ ℝ))
73	72, 31	eleqtrrd 2832	. . . . . . . . . 10 ⊢ (𝜑 → ((abs ∘ 𝐹)‘(𝐴 − 𝐵)) ∈ (abs “ (𝐹 “ ℝ)))
74	71, 73	eqeltrrd 2830	. . . . . . . . 9 ⊢ (𝜑 → (abs‘(𝐹‘(𝐴 − 𝐵))) ∈ (abs “ (𝐹 “ ℝ)))
75	25, 33, 40, 74	suprubd 12200	. . . . . . . 8 ⊢ (𝜑 → (abs‘(𝐹‘(𝐴 − 𝐵))) ≤ sup((abs “ (𝐹 “ ℝ)), ℝ, < ))
76	57, 61, 41, 41, 70, 75	le2addd 11857	. . . . . . 7 ⊢ (𝜑 → ((abs‘(𝐹‘(𝐴 + 𝐵))) + (abs‘(𝐹‘(𝐴 − 𝐵)))) ≤ (sup((abs “ (𝐹 “ ℝ)), ℝ, < ) + sup((abs “ (𝐹 “ ℝ)), ℝ, < )))
77	41	recnd 11266	. . . . . . . . 9 ⊢ (𝜑 → sup((abs “ (𝐹 “ ℝ)), ℝ, < ) ∈ ℂ)
78	77	2timesd 12479	. . . . . . . 8 ⊢ (𝜑 → (2 · sup((abs “ (𝐹 “ ℝ)), ℝ, < )) = (sup((abs “ (𝐹 “ ℝ)), ℝ, < ) + sup((abs “ (𝐹 “ ℝ)), ℝ, < )))
79	78	eqcomd 2734	. . . . . . 7 ⊢ (𝜑 → (sup((abs “ (𝐹 “ ℝ)), ℝ, < ) + sup((abs “ (𝐹 “ ℝ)), ℝ, < )) = (2 · sup((abs “ (𝐹 “ ℝ)), ℝ, < )))
80	79, 63	eqeltrd 2829	. . . . . . 7 ⊢ (𝜑 → (sup((abs “ (𝐹 “ ℝ)), ℝ, < ) + sup((abs “ (𝐹 “ ℝ)), ℝ, < )) ∈ ℝ)
81	76, 79, 62, 80	leeq2d 43582	. . . . . 6 ⊢ (𝜑 → ((abs‘(𝐹‘(𝐴 + 𝐵))) + (abs‘(𝐹‘(𝐴 − 𝐵)))) ≤ (2 · sup((abs “ (𝐹 “ ℝ)), ℝ, < )))
82	50, 62, 63, 64, 81	letrd 11395	. . . . 5 ⊢ (𝜑 → (abs‘((𝐹‘(𝐴 + 𝐵)) + (𝐹‘(𝐴 − 𝐵)))) ≤ (2 · sup((abs “ (𝐹 “ ℝ)), ℝ, < )))
83	82, 46, 50, 63	leeq1d 43581	. . . 4 ⊢ (𝜑 → (abs‘(2 · ((𝐹‘𝐴) · (𝐺‘𝐵)))) ≤ (2 · sup((abs “ (𝐹 “ ℝ)), ℝ, < )))
84		0le2 12338	. . . . . 6 ⊢ 0 ≤ 2
85	84	a1i 11	. . . . 5 ⊢ (𝜑 → 0 ≤ 2)
86	3	idi 1	. . . . . 6 ⊢ (𝜑 → (𝐹‘𝐴) ∈ ℝ)
87	8	idi 1	. . . . . 6 ⊢ (𝜑 → (𝐺‘𝐵) ∈ ℝ)
88	86, 87	remulcld 11268	. . . . 5 ⊢ (𝜑 → ((𝐹‘𝐴) · (𝐺‘𝐵)) ∈ ℝ)
89	85, 43, 88	absmulrposd 43583	. . . 4 ⊢ (𝜑 → (abs‘(2 · ((𝐹‘𝐴) · (𝐺‘𝐵)))) = (2 · (abs‘((𝐹‘𝐴) · (𝐺‘𝐵)))))
90	83, 89, 49, 63	leeq1d 43581	. . 3 ⊢ (𝜑 → (2 · (abs‘((𝐹‘𝐴) · (𝐺‘𝐵)))) ≤ (2 · sup((abs “ (𝐹 “ ℝ)), ℝ, < )))
91		2pos 12339	. . . 4 ⊢ 0 < 2
92	91	a1i 11	. . 3 ⊢ (𝜑 → 0 < 2)
93	12, 41, 43, 90, 92	wwlemuld 43580	. 2 ⊢ (𝜑 → (abs‘((𝐹‘𝐴) · (𝐺‘𝐵))) ≤ sup((abs “ (𝐹 “ ℝ)), ℝ, < ))
94	4, 9	absmuld 15427	. . 3 ⊢ (𝜑 → (abs‘((𝐹‘𝐴) · (𝐺‘𝐵))) = ((abs‘(𝐹‘𝐴)) · (abs‘(𝐺‘𝐵))))
95	94	idi 1	. 2 ⊢ (𝜑 → (abs‘((𝐹‘𝐴) · (𝐺‘𝐵))) = ((abs‘(𝐹‘𝐴)) · (abs‘(𝐺‘𝐵))))
96	93, 95, 12, 41	leeq1d 43581	1 ⊢ (𝜑 → ((abs‘(𝐹‘𝐴)) · (abs‘(𝐺‘𝐵))) ≤ sup((abs “ (𝐹 “ ℝ)), ℝ, < ))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 = wceq 1534 ∈ wcel 2099 ≠ wne 2936 ∀wral 3057 ⊆ wss 3945 ∅c0 4318 class class class wbr 5142 ran crn 5673 “ cima 5675 ∘ ccom 5676 ⟶wf 6538 ‘cfv 6542 (class class class)co 7414 supcsup 9457 ℂcc 11130 ℝcr 11131 0cc0 11132 1c1 11133 + caddc 11135 · cmul 11137 < clt 11272 ≤ cle 11273 − cmin 11468 2c2 12291 abscabs 15207

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2167 ax-ext 2699 ax-sep 5293 ax-nul 5300 ax-pow 5359 ax-pr 5423 ax-un 7734 ax-cnex 11188 ax-resscn 11189 ax-1cn 11190 ax-icn 11191 ax-addcl 11192 ax-addrcl 11193 ax-mulcl 11194 ax-mulrcl 11195 ax-mulcom 11196 ax-addass 11197 ax-mulass 11198 ax-distr 11199 ax-i2m1 11200 ax-1ne0 11201 ax-1rid 11202 ax-rnegex 11203 ax-rrecex 11204 ax-cnre 11205 ax-pre-lttri 11206 ax-pre-lttrn 11207 ax-pre-ltadd 11208 ax-pre-mulgt0 11209 ax-pre-sup 11210

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2530 df-eu 2559 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2937 df-nel 3043 df-ral 3058 df-rex 3067 df-rmo 3372 df-reu 3373 df-rab 3429 df-v 3472 df-sbc 3776 df-csb 3891 df-dif 3948 df-un 3950 df-in 3952 df-ss 3962 df-pss 3964 df-nul 4319 df-if 4525 df-pw 4600 df-sn 4625 df-pr 4627 df-op 4631 df-uni 4904 df-iun 4993 df-br 5143 df-opab 5205 df-mpt 5226 df-tr 5260 df-id 5570 df-eprel 5576 df-po 5584 df-so 5585 df-fr 5627 df-we 5629 df-xp 5678 df-rel 5679 df-cnv 5680 df-co 5681 df-dm 5682 df-rn 5683 df-res 5684 df-ima 5685 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 7370 df-ov 7417 df-oprab 7418 df-mpo 7419 df-om 7865 df-2nd 7988 df-frecs 8280 df-wrecs 8311 df-recs 8385 df-rdg 8424 df-er 8718 df-en 8958 df-dom 8959 df-sdom 8960 df-sup 9459 df-pnf 11274 df-mnf 11275 df-xr 11276 df-ltxr 11277 df-le 11278 df-sub 11470 df-neg 11471 df-div 11896 df-nn 12237 df-2 12299 df-3 12300 df-n0 12497 df-z 12583 df-uz 12847 df-rp 13001 df-seq 13993 df-exp 14053 df-cj 15072 df-re 15073 df-im 15074 df-sqrt 15208 df-abs 15209

This theorem is referenced by: imo72b2 43596

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