amgmw2d - Mathbox for Kunhao Zheng

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Theorem amgmw2d 43061

Description: Weighted arithmetic-geometric mean inequality for 𝑛 = 2 (compare amgm2d 39001). (Contributed by Kunhao Zheng, 20-Jun-2021.)

**Hypotheses**
Ref	Expression
amgmw2d.0	⊢ (𝜑 → 𝐴 ∈ ℝ⁺)
amgmw2d.1	⊢ (𝜑 → 𝑃 ∈ ℝ⁺)
amgmw2d.2	⊢ (𝜑 → 𝐵 ∈ ℝ⁺)
amgmw2d.3	⊢ (𝜑 → 𝑄 ∈ ℝ⁺)
amgmw2d.4	⊢ (𝜑 → (𝑃 + 𝑄) = 1)

**Assertion**
Ref	Expression
amgmw2d	⊢ (𝜑 → ((𝐴↑_𝑐𝑃) · (𝐵↑_𝑐𝑄)) ≤ ((𝐴 · 𝑃) + (𝐵 · 𝑄)))

**Proof of Theorem amgmw2d**
Step	Hyp	Ref	Expression
1		eqid 2758	. . 3 ⊢ (mulGrp‘ℂ_fld) = (mulGrp‘ℂ_fld)
2		fzofi 12965	. . . 4 ⊢ (0..^2) ∈ Fin
3	2	a1i 11	. . 3 ⊢ (𝜑 → (0..^2) ∈ Fin)
4		2nn 11375	. . . . 5 ⊢ 2 ∈ ℕ
5		lbfzo0 12700	. . . . 5 ⊢ (0 ∈ (0..^2) ↔ 2 ∈ ℕ)
6	4, 5	mpbir 221	. . . 4 ⊢ 0 ∈ (0..^2)
7		ne0i 4062	. . . 4 ⊢ (0 ∈ (0..^2) → (0..^2) ≠ ∅)
8	6, 7	mp1i 13	. . 3 ⊢ (𝜑 → (0..^2) ≠ ∅)
9		amgmw2d.0	. . . . . 6 ⊢ (𝜑 → 𝐴 ∈ ℝ⁺)
10		amgmw2d.2	. . . . . 6 ⊢ (𝜑 → 𝐵 ∈ ℝ⁺)
11	9, 10	s2cld 13814	. . . . 5 ⊢ (𝜑 → ⟨“𝐴𝐵”⟩ ∈ Word ℝ⁺)
12		wrdf 13494	. . . . 5 ⊢ (⟨“𝐴𝐵”⟩ ∈ Word ℝ⁺ → ⟨“𝐴𝐵”⟩:(0..^(♯‘⟨“𝐴𝐵”⟩))⟶ℝ⁺)
13	11, 12	syl 17	. . . 4 ⊢ (𝜑 → ⟨“𝐴𝐵”⟩:(0..^(♯‘⟨“𝐴𝐵”⟩))⟶ℝ⁺)
14		s2len 13832	. . . . . 6 ⊢ (♯‘⟨“𝐴𝐵”⟩) = 2
15	14	oveq2i 6822	. . . . 5 ⊢ (0..^(♯‘⟨“𝐴𝐵”⟩)) = (0..^2)
16	15	feq2i 6196	. . . 4 ⊢ (⟨“𝐴𝐵”⟩:(0..^(♯‘⟨“𝐴𝐵”⟩))⟶ℝ⁺ ↔ ⟨“𝐴𝐵”⟩:(0..^2)⟶ℝ⁺)
17	13, 16	sylib 208	. . 3 ⊢ (𝜑 → ⟨“𝐴𝐵”⟩:(0..^2)⟶ℝ⁺)
18		amgmw2d.1	. . . . . 6 ⊢ (𝜑 → 𝑃 ∈ ℝ⁺)
19		amgmw2d.3	. . . . . 6 ⊢ (𝜑 → 𝑄 ∈ ℝ⁺)
20	18, 19	s2cld 13814	. . . . 5 ⊢ (𝜑 → ⟨“𝑃𝑄”⟩ ∈ Word ℝ⁺)
21		wrdf 13494	. . . . 5 ⊢ (⟨“𝑃𝑄”⟩ ∈ Word ℝ⁺ → ⟨“𝑃𝑄”⟩:(0..^(♯‘⟨“𝑃𝑄”⟩))⟶ℝ⁺)
22	20, 21	syl 17	. . . 4 ⊢ (𝜑 → ⟨“𝑃𝑄”⟩:(0..^(♯‘⟨“𝑃𝑄”⟩))⟶ℝ⁺)
23		s2len 13832	. . . . . 6 ⊢ (♯‘⟨“𝑃𝑄”⟩) = 2
24	23	oveq2i 6822	. . . . 5 ⊢ (0..^(♯‘⟨“𝑃𝑄”⟩)) = (0..^2)
25	24	feq2i 6196	. . . 4 ⊢ (⟨“𝑃𝑄”⟩:(0..^(♯‘⟨“𝑃𝑄”⟩))⟶ℝ⁺ ↔ ⟨“𝑃𝑄”⟩:(0..^2)⟶ℝ⁺)
26	22, 25	sylib 208	. . 3 ⊢ (𝜑 → ⟨“𝑃𝑄”⟩:(0..^2)⟶ℝ⁺)
27		cnring 19968	. . . . . 6 ⊢ ℂ_fld ∈ Ring
28		ringmnd 18754	. . . . . 6 ⊢ (ℂ_fld ∈ Ring → ℂ_fld ∈ Mnd)
29	27, 28	mp1i 13	. . . . 5 ⊢ (𝜑 → ℂ_fld ∈ Mnd)
30	18	rpcnd 12065	. . . . 5 ⊢ (𝜑 → 𝑃 ∈ ℂ)
31	19	rpcnd 12065	. . . . 5 ⊢ (𝜑 → 𝑄 ∈ ℂ)
32		cnfldbas 19950	. . . . . 6 ⊢ ℂ = (Base‘ℂ_fld)
33		cnfldadd 19951	. . . . . 6 ⊢ + = (+_g‘ℂ_fld)
34	32, 33	gsumws2 17578	. . . . 5 ⊢ ((ℂ_fld ∈ Mnd ∧ 𝑃 ∈ ℂ ∧ 𝑄 ∈ ℂ) → (ℂ_fld Σ_g ⟨“𝑃𝑄”⟩) = (𝑃 + 𝑄))
35	29, 30, 31, 34	syl3anc 1477	. . . 4 ⊢ (𝜑 → (ℂ_fld Σ_g ⟨“𝑃𝑄”⟩) = (𝑃 + 𝑄))
36		amgmw2d.4	. . . 4 ⊢ (𝜑 → (𝑃 + 𝑄) = 1)
37	35, 36	eqtrd 2792	. . 3 ⊢ (𝜑 → (ℂ_fld Σ_g ⟨“𝑃𝑄”⟩) = 1)
38	1, 3, 8, 17, 26, 37	amgmwlem 43059	. 2 ⊢ (𝜑 → ((mulGrp‘ℂ_fld) Σ_g (⟨“𝐴𝐵”⟩ ∘_𝑓 ↑_𝑐⟨“𝑃𝑄”⟩)) ≤ (ℂ_fld Σ_g (⟨“𝐴𝐵”⟩ ∘_𝑓 · ⟨“𝑃𝑄”⟩)))
39	9, 10	jca 555	. . . . 5 ⊢ (𝜑 → (𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℝ⁺))
40	18, 19	jca 555	. . . . 5 ⊢ (𝜑 → (𝑃 ∈ ℝ⁺ ∧ 𝑄 ∈ ℝ⁺))
41		ofs2 13909	. . . . 5 ⊢ (((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℝ⁺) ∧ (𝑃 ∈ ℝ⁺ ∧ 𝑄 ∈ ℝ⁺)) → (⟨“𝐴𝐵”⟩ ∘_𝑓 ↑_𝑐⟨“𝑃𝑄”⟩) = ⟨“(𝐴↑_𝑐𝑃)(𝐵↑_𝑐𝑄)”⟩)
42	39, 40, 41	syl2anc 696	. . . 4 ⊢ (𝜑 → (⟨“𝐴𝐵”⟩ ∘_𝑓 ↑_𝑐⟨“𝑃𝑄”⟩) = ⟨“(𝐴↑_𝑐𝑃)(𝐵↑_𝑐𝑄)”⟩)
43	42	oveq2d 6827	. . 3 ⊢ (𝜑 → ((mulGrp‘ℂ_fld) Σ_g (⟨“𝐴𝐵”⟩ ∘_𝑓 ↑_𝑐⟨“𝑃𝑄”⟩)) = ((mulGrp‘ℂ_fld) Σ_g ⟨“(𝐴↑_𝑐𝑃)(𝐵↑_𝑐𝑄)”⟩))
44	1	ringmgp 18751	. . . . 5 ⊢ (ℂ_fld ∈ Ring → (mulGrp‘ℂ_fld) ∈ Mnd)
45	27, 44	mp1i 13	. . . 4 ⊢ (𝜑 → (mulGrp‘ℂ_fld) ∈ Mnd)
46	18	rpred 12063	. . . . . 6 ⊢ (𝜑 → 𝑃 ∈ ℝ)
47	9, 46	rpcxpcld 24673	. . . . 5 ⊢ (𝜑 → (𝐴↑_𝑐𝑃) ∈ ℝ⁺)
48	47	rpcnd 12065	. . . 4 ⊢ (𝜑 → (𝐴↑_𝑐𝑃) ∈ ℂ)
49	19	rpred 12063	. . . . . 6 ⊢ (𝜑 → 𝑄 ∈ ℝ)
50	10, 49	rpcxpcld 24673	. . . . 5 ⊢ (𝜑 → (𝐵↑_𝑐𝑄) ∈ ℝ⁺)
51	50	rpcnd 12065	. . . 4 ⊢ (𝜑 → (𝐵↑_𝑐𝑄) ∈ ℂ)
52	1, 32	mgpbas 18693	. . . . 5 ⊢ ℂ = (Base‘(mulGrp‘ℂ_fld))
53		cnfldmul 19952	. . . . . 6 ⊢ · = (._r‘ℂ_fld)
54	1, 53	mgpplusg 18691	. . . . 5 ⊢ · = (+_g‘(mulGrp‘ℂ_fld))
55	52, 54	gsumws2 17578	. . . 4 ⊢ (((mulGrp‘ℂ_fld) ∈ Mnd ∧ (𝐴↑_𝑐𝑃) ∈ ℂ ∧ (𝐵↑_𝑐𝑄) ∈ ℂ) → ((mulGrp‘ℂ_fld) Σ_g ⟨“(𝐴↑_𝑐𝑃)(𝐵↑_𝑐𝑄)”⟩) = ((𝐴↑_𝑐𝑃) · (𝐵↑_𝑐𝑄)))
56	45, 48, 51, 55	syl3anc 1477	. . 3 ⊢ (𝜑 → ((mulGrp‘ℂ_fld) Σ_g ⟨“(𝐴↑_𝑐𝑃)(𝐵↑_𝑐𝑄)”⟩) = ((𝐴↑_𝑐𝑃) · (𝐵↑_𝑐𝑄)))
57	43, 56	eqtrd 2792	. 2 ⊢ (𝜑 → ((mulGrp‘ℂ_fld) Σ_g (⟨“𝐴𝐵”⟩ ∘_𝑓 ↑_𝑐⟨“𝑃𝑄”⟩)) = ((𝐴↑_𝑐𝑃) · (𝐵↑_𝑐𝑄)))
58		ofs2 13909	. . . . 5 ⊢ (((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℝ⁺) ∧ (𝑃 ∈ ℝ⁺ ∧ 𝑄 ∈ ℝ⁺)) → (⟨“𝐴𝐵”⟩ ∘_𝑓 · ⟨“𝑃𝑄”⟩) = ⟨“(𝐴 · 𝑃)(𝐵 · 𝑄)”⟩)
59	39, 40, 58	syl2anc 696	. . . 4 ⊢ (𝜑 → (⟨“𝐴𝐵”⟩ ∘_𝑓 · ⟨“𝑃𝑄”⟩) = ⟨“(𝐴 · 𝑃)(𝐵 · 𝑄)”⟩)
60	59	oveq2d 6827	. . 3 ⊢ (𝜑 → (ℂ_fld Σ_g (⟨“𝐴𝐵”⟩ ∘_𝑓 · ⟨“𝑃𝑄”⟩)) = (ℂ_fld Σ_g ⟨“(𝐴 · 𝑃)(𝐵 · 𝑄)”⟩))
61	9, 18	rpmulcld 12079	. . . . 5 ⊢ (𝜑 → (𝐴 · 𝑃) ∈ ℝ⁺)
62	61	rpcnd 12065	. . . 4 ⊢ (𝜑 → (𝐴 · 𝑃) ∈ ℂ)
63	10, 19	rpmulcld 12079	. . . . 5 ⊢ (𝜑 → (𝐵 · 𝑄) ∈ ℝ⁺)
64	63	rpcnd 12065	. . . 4 ⊢ (𝜑 → (𝐵 · 𝑄) ∈ ℂ)
65	32, 33	gsumws2 17578	. . . 4 ⊢ ((ℂ_fld ∈ Mnd ∧ (𝐴 · 𝑃) ∈ ℂ ∧ (𝐵 · 𝑄) ∈ ℂ) → (ℂ_fld Σ_g ⟨“(𝐴 · 𝑃)(𝐵 · 𝑄)”⟩) = ((𝐴 · 𝑃) + (𝐵 · 𝑄)))
66	29, 62, 64, 65	syl3anc 1477	. . 3 ⊢ (𝜑 → (ℂ_fld Σ_g ⟨“(𝐴 · 𝑃)(𝐵 · 𝑄)”⟩) = ((𝐴 · 𝑃) + (𝐵 · 𝑄)))
67	60, 66	eqtrd 2792	. 2 ⊢ (𝜑 → (ℂ_fld Σ_g (⟨“𝐴𝐵”⟩ ∘_𝑓 · ⟨“𝑃𝑄”⟩)) = ((𝐴 · 𝑃) + (𝐵 · 𝑄)))
68	38, 57, 67	3brtr3d 4833	1 ⊢ (𝜑 → ((𝐴↑_𝑐𝑃) · (𝐵↑_𝑐𝑄)) ≤ ((𝐴 · 𝑃) + (𝐵 · 𝑄)))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 383 = wceq 1630 ∈ wcel 2137 ≠ wne 2930 ∅c0 4056 class class class wbr 4802 ⟶wf 6043 ‘cfv 6047 (class class class)co 6811 ∘_𝑓 cof 7058 Fincfn 8119 ℂcc 10124 0cc0 10126 1c1 10127 + caddc 10129 · cmul 10131 ≤ cle 10265 ℕcn 11210 2c2 11260 ℝ⁺crp 12023 ..^cfzo 12657 ♯chash 13309 Word cword 13475 ⟨“cs2 13784 Σ_g cgsu 16301 Mndcmnd 17493 mulGrpcmgp 18687 Ringcrg 18745 ℂ_fldccnfld 19946 ↑_𝑐ccxp 24499

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1869 ax-4 1884 ax-5 1986 ax-6 2052 ax-7 2088 ax-8 2139 ax-9 2146 ax-10 2166 ax-11 2181 ax-12 2194 ax-13 2389 ax-ext 2738 ax-rep 4921 ax-sep 4931 ax-nul 4939 ax-pow 4990 ax-pr 5053 ax-un 7112 ax-inf2 8709 ax-cnex 10182 ax-resscn 10183 ax-1cn 10184 ax-icn 10185 ax-addcl 10186 ax-addrcl 10187 ax-mulcl 10188 ax-mulrcl 10189 ax-mulcom 10190 ax-addass 10191 ax-mulass 10192 ax-distr 10193 ax-i2m1 10194 ax-1ne0 10195 ax-1rid 10196 ax-rnegex 10197 ax-rrecex 10198 ax-cnre 10199 ax-pre-lttri 10200 ax-pre-lttrn 10201 ax-pre-ltadd 10202 ax-pre-mulgt0 10203 ax-pre-sup 10204 ax-addf 10205 ax-mulf 10206

This theorem depends on definitions: df-bi 197 df-or 384 df-an 385 df-3or 1073 df-3an 1074 df-tru 1633 df-fal 1636 df-ex 1852 df-nf 1857 df-sb 2045 df-eu 2609 df-mo 2610 df-clab 2745 df-cleq 2751 df-clel 2754 df-nfc 2889 df-ne 2931 df-nel 3034 df-ral 3053 df-rex 3054 df-reu 3055 df-rmo 3056 df-rab 3057 df-v 3340 df-sbc 3575 df-csb 3673 df-dif 3716 df-un 3718 df-in 3720 df-ss 3727 df-pss 3729 df-nul 4057 df-if 4229 df-pw 4302 df-sn 4320 df-pr 4322 df-tp 4324 df-op 4326 df-uni 4587 df-int 4626 df-iun 4672 df-iin 4673 df-br 4803 df-opab 4863 df-mpt 4880 df-tr 4903 df-id 5172 df-eprel 5177 df-po 5185 df-so 5186 df-fr 5223 df-se 5224 df-we 5225 df-xp 5270 df-rel 5271 df-cnv 5272 df-co 5273 df-dm 5274 df-rn 5275 df-res 5276 df-ima 5277 df-pred 5839 df-ord 5885 df-on 5886 df-lim 5887 df-suc 5888 df-iota 6010 df-fun 6049 df-fn 6050 df-f 6051 df-f1 6052 df-fo 6053 df-f1o 6054 df-fv 6055 df-isom 6056 df-riota 6772 df-ov 6814 df-oprab 6815 df-mpt2 6816 df-of 7060 df-om 7229 df-1st 7331 df-2nd 7332 df-supp 7462 df-tpos 7519 df-wrecs 7574 df-recs 7635 df-rdg 7673 df-1o 7727 df-2o 7728 df-oadd 7731 df-er 7909 df-map 8023 df-pm 8024 df-ixp 8073 df-en 8120 df-dom 8121 df-sdom 8122 df-fin 8123 df-fsupp 8439 df-fi 8480 df-sup 8511 df-inf 8512 df-oi 8578 df-card 8953 df-cda 9180 df-pnf 10266 df-mnf 10267 df-xr 10268 df-ltxr 10269 df-le 10270 df-sub 10458 df-neg 10459 df-div 10875 df-nn 11211 df-2 11269 df-3 11270 df-4 11271 df-5 11272 df-6 11273 df-7 11274 df-8 11275 df-9 11276 df-n0 11483 df-z 11568 df-dec 11684 df-uz 11878 df-q 11980 df-rp 12024 df-xneg 12137 df-xadd 12138 df-xmul 12139 df-ioo 12370 df-ioc 12371 df-ico 12372 df-icc 12373 df-fz 12518 df-fzo 12658 df-fl 12785 df-mod 12861 df-seq 12994 df-exp 13053 df-fac 13253 df-bc 13282 df-hash 13310 df-word 13483 df-concat 13485 df-s1 13486 df-s2 13791 df-shft 14004 df-cj 14036 df-re 14037 df-im 14038 df-sqrt 14172 df-abs 14173 df-limsup 14399 df-clim 14416 df-rlim 14417 df-sum 14614 df-ef 14995 df-sin 14997 df-cos 14998 df-pi 15000 df-struct 16059 df-ndx 16060 df-slot 16061 df-base 16063 df-sets 16064 df-ress 16065 df-plusg 16154 df-mulr 16155 df-starv 16156 df-sca 16157 df-vsca 16158 df-ip 16159 df-tset 16160 df-ple 16161 df-ds 16164 df-unif 16165 df-hom 16166 df-cco 16167 df-rest 16283 df-topn 16284 df-0g 16302 df-gsum 16303 df-topgen 16304 df-pt 16305 df-prds 16308 df-xrs 16362 df-qtop 16367 df-imas 16368 df-xps 16370 df-mre 16446 df-mrc 16447 df-acs 16449 df-mgm 17441 df-sgrp 17483 df-mnd 17494 df-mhm 17534 df-submnd 17535 df-grp 17624 df-minusg 17625 df-mulg 17740 df-subg 17790 df-ghm 17857 df-gim 17900 df-cntz 17948 df-cmn 18393 df-abl 18394 df-mgp 18688 df-ur 18700 df-ring 18747 df-cring 18748 df-oppr 18821 df-dvdsr 18839 df-unit 18840 df-invr 18870 df-dvr 18881 df-drng 18949 df-subrg 18978 df-psmet 19938 df-xmet 19939 df-met 19940 df-bl 19941 df-mopn 19942 df-fbas 19943 df-fg 19944 df-cnfld 19947 df-refld 20151 df-top 20899 df-topon 20916 df-topsp 20937 df-bases 20950 df-cld 21023 df-ntr 21024 df-cls 21025 df-nei 21102 df-lp 21140 df-perf 21141 df-cn 21231 df-cnp 21232 df-haus 21319 df-cmp 21390 df-tx 21565 df-hmeo 21758 df-fil 21849 df-fm 21941 df-flim 21942 df-flf 21943 df-xms 22324 df-ms 22325 df-tms 22326 df-cncf 22880 df-limc 23827 df-dv 23828 df-log 24500 df-cxp 24501

This theorem is referenced by: young2d 43062

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