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Mathbox for Stanislas Polu |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > amgm2d | Structured version Visualization version GIF version |
Description: Arithmetic-geometric mean inequality for 𝑛 = 2, derived from amgmlem 27048. (Contributed by Stanislas Polu, 8-Sep-2020.) |
Ref | Expression |
---|---|
amgm2d.0 | ⊢ (𝜑 → 𝐴 ∈ ℝ+) |
amgm2d.1 | ⊢ (𝜑 → 𝐵 ∈ ℝ+) |
Ref | Expression |
---|---|
amgm2d | ⊢ (𝜑 → ((𝐴 · 𝐵)↑𝑐(1 / 2)) ≤ ((𝐴 + 𝐵) / 2)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqid 2735 | . . 3 ⊢ (mulGrp‘ℂfld) = (mulGrp‘ℂfld) | |
2 | fzofi 14012 | . . . 4 ⊢ (0..^2) ∈ Fin | |
3 | 2 | a1i 11 | . . 3 ⊢ (𝜑 → (0..^2) ∈ Fin) |
4 | 2nn 12337 | . . . . . 6 ⊢ 2 ∈ ℕ | |
5 | lbfzo0 13736 | . . . . . 6 ⊢ (0 ∈ (0..^2) ↔ 2 ∈ ℕ) | |
6 | 4, 5 | mpbir 231 | . . . . 5 ⊢ 0 ∈ (0..^2) |
7 | 6 | ne0ii 4350 | . . . 4 ⊢ (0..^2) ≠ ∅ |
8 | 7 | a1i 11 | . . 3 ⊢ (𝜑 → (0..^2) ≠ ∅) |
9 | amgm2d.0 | . . . . 5 ⊢ (𝜑 → 𝐴 ∈ ℝ+) | |
10 | amgm2d.1 | . . . . 5 ⊢ (𝜑 → 𝐵 ∈ ℝ+) | |
11 | 9, 10 | s2cld 14907 | . . . 4 ⊢ (𝜑 → 〈“𝐴𝐵”〉 ∈ Word ℝ+) |
12 | wrdf 14554 | . . . . 5 ⊢ (〈“𝐴𝐵”〉 ∈ Word ℝ+ → 〈“𝐴𝐵”〉:(0..^(♯‘〈“𝐴𝐵”〉))⟶ℝ+) | |
13 | s2len 14925 | . . . . . . . 8 ⊢ (♯‘〈“𝐴𝐵”〉) = 2 | |
14 | 13 | eqcomi 2744 | . . . . . . 7 ⊢ 2 = (♯‘〈“𝐴𝐵”〉) |
15 | 14 | oveq2i 7442 | . . . . . 6 ⊢ (0..^2) = (0..^(♯‘〈“𝐴𝐵”〉)) |
16 | 15 | feq2i 6729 | . . . . 5 ⊢ (〈“𝐴𝐵”〉:(0..^2)⟶ℝ+ ↔ 〈“𝐴𝐵”〉:(0..^(♯‘〈“𝐴𝐵”〉))⟶ℝ+) |
17 | 12, 16 | sylibr 234 | . . . 4 ⊢ (〈“𝐴𝐵”〉 ∈ Word ℝ+ → 〈“𝐴𝐵”〉:(0..^2)⟶ℝ+) |
18 | 11, 17 | syl 17 | . . 3 ⊢ (𝜑 → 〈“𝐴𝐵”〉:(0..^2)⟶ℝ+) |
19 | 1, 3, 8, 18 | amgmlem 27048 | . 2 ⊢ (𝜑 → (((mulGrp‘ℂfld) Σg 〈“𝐴𝐵”〉)↑𝑐(1 / (♯‘(0..^2)))) ≤ ((ℂfld Σg 〈“𝐴𝐵”〉) / (♯‘(0..^2)))) |
20 | cnring 21421 | . . . . 5 ⊢ ℂfld ∈ Ring | |
21 | 1 | ringmgp 20257 | . . . . 5 ⊢ (ℂfld ∈ Ring → (mulGrp‘ℂfld) ∈ Mnd) |
22 | 20, 21 | mp1i 13 | . . . 4 ⊢ (𝜑 → (mulGrp‘ℂfld) ∈ Mnd) |
23 | 9 | rpcnd 13077 | . . . 4 ⊢ (𝜑 → 𝐴 ∈ ℂ) |
24 | 10 | rpcnd 13077 | . . . 4 ⊢ (𝜑 → 𝐵 ∈ ℂ) |
25 | cnfldbas 21386 | . . . . . 6 ⊢ ℂ = (Base‘ℂfld) | |
26 | 1, 25 | mgpbas 20158 | . . . . 5 ⊢ ℂ = (Base‘(mulGrp‘ℂfld)) |
27 | cnfldmul 21390 | . . . . . 6 ⊢ · = (.r‘ℂfld) | |
28 | 1, 27 | mgpplusg 20156 | . . . . 5 ⊢ · = (+g‘(mulGrp‘ℂfld)) |
29 | 26, 28 | gsumws2 18868 | . . . 4 ⊢ (((mulGrp‘ℂfld) ∈ Mnd ∧ 𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → ((mulGrp‘ℂfld) Σg 〈“𝐴𝐵”〉) = (𝐴 · 𝐵)) |
30 | 22, 23, 24, 29 | syl3anc 1370 | . . 3 ⊢ (𝜑 → ((mulGrp‘ℂfld) Σg 〈“𝐴𝐵”〉) = (𝐴 · 𝐵)) |
31 | 2nn0 12541 | . . . . 5 ⊢ 2 ∈ ℕ0 | |
32 | hashfzo0 14466 | . . . . 5 ⊢ (2 ∈ ℕ0 → (♯‘(0..^2)) = 2) | |
33 | 31, 32 | mp1i 13 | . . . 4 ⊢ (𝜑 → (♯‘(0..^2)) = 2) |
34 | 33 | oveq2d 7447 | . . 3 ⊢ (𝜑 → (1 / (♯‘(0..^2))) = (1 / 2)) |
35 | 30, 34 | oveq12d 7449 | . 2 ⊢ (𝜑 → (((mulGrp‘ℂfld) Σg 〈“𝐴𝐵”〉)↑𝑐(1 / (♯‘(0..^2)))) = ((𝐴 · 𝐵)↑𝑐(1 / 2))) |
36 | ringmnd 20261 | . . . . 5 ⊢ (ℂfld ∈ Ring → ℂfld ∈ Mnd) | |
37 | 20, 36 | mp1i 13 | . . . 4 ⊢ (𝜑 → ℂfld ∈ Mnd) |
38 | cnfldadd 21388 | . . . . 5 ⊢ + = (+g‘ℂfld) | |
39 | 25, 38 | gsumws2 18868 | . . . 4 ⊢ ((ℂfld ∈ Mnd ∧ 𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (ℂfld Σg 〈“𝐴𝐵”〉) = (𝐴 + 𝐵)) |
40 | 37, 23, 24, 39 | syl3anc 1370 | . . 3 ⊢ (𝜑 → (ℂfld Σg 〈“𝐴𝐵”〉) = (𝐴 + 𝐵)) |
41 | 40, 33 | oveq12d 7449 | . 2 ⊢ (𝜑 → ((ℂfld Σg 〈“𝐴𝐵”〉) / (♯‘(0..^2))) = ((𝐴 + 𝐵) / 2)) |
42 | 19, 35, 41 | 3brtr3d 5179 | 1 ⊢ (𝜑 → ((𝐴 · 𝐵)↑𝑐(1 / 2)) ≤ ((𝐴 + 𝐵) / 2)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1537 ∈ wcel 2106 ≠ wne 2938 ∅c0 4339 class class class wbr 5148 ⟶wf 6559 ‘cfv 6563 (class class class)co 7431 Fincfn 8984 ℂcc 11151 0cc0 11153 1c1 11154 + caddc 11156 · cmul 11158 ≤ cle 11294 / cdiv 11918 ℕcn 12264 2c2 12319 ℕ0cn0 12524 ℝ+crp 13032 ..^cfzo 13691 ♯chash 14366 Word cword 14549 〈“cs2 14877 Σg cgsu 17487 Mndcmnd 18760 mulGrpcmgp 20152 Ringcrg 20251 ℂfldccnfld 21382 ↑𝑐ccxp 26612 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1908 ax-6 1965 ax-7 2005 ax-8 2108 ax-9 2116 ax-10 2139 ax-11 2155 ax-12 2175 ax-ext 2706 ax-rep 5285 ax-sep 5302 ax-nul 5312 ax-pow 5371 ax-pr 5438 ax-un 7754 ax-inf2 9679 ax-cnex 11209 ax-resscn 11210 ax-1cn 11211 ax-icn 11212 ax-addcl 11213 ax-addrcl 11214 ax-mulcl 11215 ax-mulrcl 11216 ax-mulcom 11217 ax-addass 11218 ax-mulass 11219 ax-distr 11220 ax-i2m1 11221 ax-1ne0 11222 ax-1rid 11223 ax-rnegex 11224 ax-rrecex 11225 ax-cnre 11226 ax-pre-lttri 11227 ax-pre-lttrn 11228 ax-pre-ltadd 11229 ax-pre-mulgt0 11230 ax-pre-sup 11231 ax-addf 11232 ax-mulf 11233 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1540 df-fal 1550 df-ex 1777 df-nf 1781 df-sb 2063 df-mo 2538 df-eu 2567 df-clab 2713 df-cleq 2727 df-clel 2814 df-nfc 2890 df-ne 2939 df-nel 3045 df-ral 3060 df-rex 3069 df-rmo 3378 df-reu 3379 df-rab 3434 df-v 3480 df-sbc 3792 df-csb 3909 df-dif 3966 df-un 3968 df-in 3970 df-ss 3980 df-pss 3983 df-nul 4340 df-if 4532 df-pw 4607 df-sn 4632 df-pr 4634 df-tp 4636 df-op 4638 df-uni 4913 df-int 4952 df-iun 4998 df-iin 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5583 df-eprel 5589 df-po 5597 df-so 5598 df-fr 5641 df-se 5642 df-we 5643 df-xp 5695 df-rel 5696 df-cnv 5697 df-co 5698 df-dm 5699 df-rn 5700 df-res 5701 df-ima 5702 df-pred 6323 df-ord 6389 df-on 6390 df-lim 6391 df-suc 6392 df-iota 6516 df-fun 6565 df-fn 6566 df-f 6567 df-f1 6568 df-fo 6569 df-f1o 6570 df-fv 6571 df-isom 6572 df-riota 7388 df-ov 7434 df-oprab 7435 df-mpo 7436 df-of 7697 df-om 7888 df-1st 8013 df-2nd 8014 df-supp 8185 df-tpos 8250 df-frecs 8305 df-wrecs 8336 df-recs 8410 df-rdg 8449 df-1o 8505 df-2o 8506 df-er 8744 df-map 8867 df-pm 8868 df-ixp 8937 df-en 8985 df-dom 8986 df-sdom 8987 df-fin 8988 df-fsupp 9400 df-fi 9449 df-sup 9480 df-inf 9481 df-oi 9548 df-card 9977 df-pnf 11295 df-mnf 11296 df-xr 11297 df-ltxr 11298 df-le 11299 df-sub 11492 df-neg 11493 df-div 11919 df-nn 12265 df-2 12327 df-3 12328 df-4 12329 df-5 12330 df-6 12331 df-7 12332 df-8 12333 df-9 12334 df-n0 12525 df-z 12612 df-dec 12732 df-uz 12877 df-q 12989 df-rp 13033 df-xneg 13152 df-xadd 13153 df-xmul 13154 df-ioo 13388 df-ioc 13389 df-ico 13390 df-icc 13391 df-fz 13545 df-fzo 13692 df-fl 13829 df-mod 13907 df-seq 14040 df-exp 14100 df-fac 14310 df-bc 14339 df-hash 14367 df-word 14550 df-concat 14606 df-s1 14631 df-s2 14884 df-shft 15103 df-cj 15135 df-re 15136 df-im 15137 df-sqrt 15271 df-abs 15272 df-limsup 15504 df-clim 15521 df-rlim 15522 df-sum 15720 df-ef 16100 df-sin 16102 df-cos 16103 df-pi 16105 df-struct 17181 df-sets 17198 df-slot 17216 df-ndx 17228 df-base 17246 df-ress 17275 df-plusg 17311 df-mulr 17312 df-starv 17313 df-sca 17314 df-vsca 17315 df-ip 17316 df-tset 17317 df-ple 17318 df-ds 17320 df-unif 17321 df-hom 17322 df-cco 17323 df-rest 17469 df-topn 17470 df-0g 17488 df-gsum 17489 df-topgen 17490 df-pt 17491 df-prds 17494 df-xrs 17549 df-qtop 17554 df-imas 17555 df-xps 17557 df-mre 17631 df-mrc 17632 df-acs 17634 df-mgm 18666 df-sgrp 18745 df-mnd 18761 df-mhm 18809 df-submnd 18810 df-grp 18967 df-minusg 18968 df-mulg 19099 df-subg 19154 df-ghm 19244 df-gim 19290 df-cntz 19348 df-cmn 19815 df-abl 19816 df-mgp 20153 df-rng 20171 df-ur 20200 df-ring 20253 df-cring 20254 df-oppr 20351 df-dvdsr 20374 df-unit 20375 df-invr 20405 df-dvr 20418 df-subrng 20563 df-subrg 20587 df-drng 20748 df-psmet 21374 df-xmet 21375 df-met 21376 df-bl 21377 df-mopn 21378 df-fbas 21379 df-fg 21380 df-cnfld 21383 df-refld 21641 df-top 22916 df-topon 22933 df-topsp 22955 df-bases 22969 df-cld 23043 df-ntr 23044 df-cls 23045 df-nei 23122 df-lp 23160 df-perf 23161 df-cn 23251 df-cnp 23252 df-haus 23339 df-cmp 23411 df-tx 23586 df-hmeo 23779 df-fil 23870 df-fm 23962 df-flim 23963 df-flf 23964 df-xms 24346 df-ms 24347 df-tms 24348 df-cncf 24918 df-limc 25916 df-dv 25917 df-log 26613 df-cxp 26614 |
This theorem is referenced by: (None) |
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