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Mirrors > Home > MPE Home > Th. List > minveco | Structured version Visualization version GIF version |
Description: Minimizing vector theorem, or the Hilbert projection theorem. There is exactly one vector in a complete subspace 𝑊 that minimizes the distance to an arbitrary vector 𝐴 in a parent inner product space. Theorem 3.3-1 of [Kreyszig] p. 144, specialized to subspaces instead of convex subsets. (Contributed by NM, 11-Apr-2008.) (Proof shortened by Mario Carneiro, 9-May-2014.) (New usage is discouraged.) |
Ref | Expression |
---|---|
minveco.x | ⊢ 𝑋 = (BaseSet‘𝑈) |
minveco.m | ⊢ 𝑀 = ( −𝑣 ‘𝑈) |
minveco.n | ⊢ 𝑁 = (normCV‘𝑈) |
minveco.y | ⊢ 𝑌 = (BaseSet‘𝑊) |
minveco.u | ⊢ (𝜑 → 𝑈 ∈ CPreHilOLD) |
minveco.w | ⊢ (𝜑 → 𝑊 ∈ ((SubSp‘𝑈) ∩ CBan)) |
minveco.a | ⊢ (𝜑 → 𝐴 ∈ 𝑋) |
Ref | Expression |
---|---|
minveco | ⊢ (𝜑 → ∃!𝑥 ∈ 𝑌 ∀𝑦 ∈ 𝑌 (𝑁‘(𝐴𝑀𝑥)) ≤ (𝑁‘(𝐴𝑀𝑦))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | minveco.x | . 2 ⊢ 𝑋 = (BaseSet‘𝑈) | |
2 | minveco.m | . 2 ⊢ 𝑀 = ( −𝑣 ‘𝑈) | |
3 | minveco.n | . 2 ⊢ 𝑁 = (normCV‘𝑈) | |
4 | minveco.y | . 2 ⊢ 𝑌 = (BaseSet‘𝑊) | |
5 | minveco.u | . 2 ⊢ (𝜑 → 𝑈 ∈ CPreHilOLD) | |
6 | minveco.w | . 2 ⊢ (𝜑 → 𝑊 ∈ ((SubSp‘𝑈) ∩ CBan)) | |
7 | minveco.a | . 2 ⊢ (𝜑 → 𝐴 ∈ 𝑋) | |
8 | eqid 2651 | . 2 ⊢ (IndMet‘𝑈) = (IndMet‘𝑈) | |
9 | eqid 2651 | . 2 ⊢ (MetOpen‘(IndMet‘𝑈)) = (MetOpen‘(IndMet‘𝑈)) | |
10 | oveq2 6698 | . . . . 5 ⊢ (𝑗 = 𝑦 → (𝐴𝑀𝑗) = (𝐴𝑀𝑦)) | |
11 | 10 | fveq2d 6233 | . . . 4 ⊢ (𝑗 = 𝑦 → (𝑁‘(𝐴𝑀𝑗)) = (𝑁‘(𝐴𝑀𝑦))) |
12 | 11 | cbvmptv 4783 | . . 3 ⊢ (𝑗 ∈ 𝑌 ↦ (𝑁‘(𝐴𝑀𝑗))) = (𝑦 ∈ 𝑌 ↦ (𝑁‘(𝐴𝑀𝑦))) |
13 | 12 | rneqi 5384 | . 2 ⊢ ran (𝑗 ∈ 𝑌 ↦ (𝑁‘(𝐴𝑀𝑗))) = ran (𝑦 ∈ 𝑌 ↦ (𝑁‘(𝐴𝑀𝑦))) |
14 | eqid 2651 | . 2 ⊢ inf(ran (𝑗 ∈ 𝑌 ↦ (𝑁‘(𝐴𝑀𝑗))), ℝ, < ) = inf(ran (𝑗 ∈ 𝑌 ↦ (𝑁‘(𝐴𝑀𝑗))), ℝ, < ) | |
15 | 1, 2, 3, 4, 5, 6, 7, 8, 9, 13, 14 | minvecolem7 27867 | 1 ⊢ (𝜑 → ∃!𝑥 ∈ 𝑌 ∀𝑦 ∈ 𝑌 (𝑁‘(𝐴𝑀𝑥)) ≤ (𝑁‘(𝐴𝑀𝑦))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1523 ∈ wcel 2030 ∀wral 2941 ∃!wreu 2943 ∩ cin 3606 class class class wbr 4685 ↦ cmpt 4762 ran crn 5144 ‘cfv 5926 (class class class)co 6690 infcinf 8388 ℝcr 9973 < clt 10112 ≤ cle 10113 MetOpencmopn 19784 BaseSetcba 27569 −𝑣 cnsb 27572 normCVcnmcv 27573 IndMetcims 27574 SubSpcss 27704 CPreHilOLDccphlo 27795 CBanccbn 27846 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1762 ax-4 1777 ax-5 1879 ax-6 1945 ax-7 1981 ax-8 2032 ax-9 2039 ax-10 2059 ax-11 2074 ax-12 2087 ax-13 2282 ax-ext 2631 ax-rep 4804 ax-sep 4814 ax-nul 4822 ax-pow 4873 ax-pr 4936 ax-un 6991 ax-inf2 8576 ax-cc 9295 ax-cnex 10030 ax-resscn 10031 ax-1cn 10032 ax-icn 10033 ax-addcl 10034 ax-addrcl 10035 ax-mulcl 10036 ax-mulrcl 10037 ax-mulcom 10038 ax-addass 10039 ax-mulass 10040 ax-distr 10041 ax-i2m1 10042 ax-1ne0 10043 ax-1rid 10044 ax-rnegex 10045 ax-rrecex 10046 ax-cnre 10047 ax-pre-lttri 10048 ax-pre-lttrn 10049 ax-pre-ltadd 10050 ax-pre-mulgt0 10051 ax-pre-sup 10052 ax-addf 10053 ax-mulf 10054 |
This theorem depends on definitions: df-bi 197 df-or 384 df-an 385 df-3or 1055 df-3an 1056 df-tru 1526 df-ex 1745 df-nf 1750 df-sb 1938 df-eu 2502 df-mo 2503 df-clab 2638 df-cleq 2644 df-clel 2647 df-nfc 2782 df-ne 2824 df-nel 2927 df-ral 2946 df-rex 2947 df-reu 2948 df-rmo 2949 df-rab 2950 df-v 3233 df-sbc 3469 df-csb 3567 df-dif 3610 df-un 3612 df-in 3614 df-ss 3621 df-pss 3623 df-nul 3949 df-if 4120 df-pw 4193 df-sn 4211 df-pr 4213 df-tp 4215 df-op 4217 df-uni 4469 df-int 4508 df-iun 4554 df-iin 4555 df-br 4686 df-opab 4746 df-mpt 4763 df-tr 4786 df-id 5053 df-eprel 5058 df-po 5064 df-so 5065 df-fr 5102 df-we 5104 df-xp 5149 df-rel 5150 df-cnv 5151 df-co 5152 df-dm 5153 df-rn 5154 df-res 5155 df-ima 5156 df-pred 5718 df-ord 5764 df-on 5765 df-lim 5766 df-suc 5767 df-iota 5889 df-fun 5928 df-fn 5929 df-f 5930 df-f1 5931 df-fo 5932 df-f1o 5933 df-fv 5934 df-riota 6651 df-ov 6693 df-oprab 6694 df-mpt2 6695 df-om 7108 df-1st 7210 df-2nd 7211 df-wrecs 7452 df-recs 7513 df-rdg 7551 df-oadd 7609 df-er 7787 df-map 7901 df-pm 7902 df-en 7998 df-dom 7999 df-sdom 8000 df-fin 8001 df-fi 8358 df-sup 8389 df-inf 8390 df-pnf 10114 df-mnf 10115 df-xr 10116 df-ltxr 10117 df-le 10118 df-sub 10306 df-neg 10307 df-div 10723 df-nn 11059 df-2 11117 df-3 11118 df-4 11119 df-n0 11331 df-z 11416 df-uz 11726 df-q 11827 df-rp 11871 df-xneg 11984 df-xadd 11985 df-xmul 11986 df-ico 12219 df-icc 12220 df-fl 12633 df-seq 12842 df-exp 12901 df-cj 13883 df-re 13884 df-im 13885 df-sqrt 14019 df-abs 14020 df-rest 16130 df-topgen 16151 df-psmet 19786 df-xmet 19787 df-met 19788 df-bl 19789 df-mopn 19790 df-fbas 19791 df-fg 19792 df-top 20747 df-topon 20764 df-bases 20798 df-cld 20871 df-ntr 20872 df-cls 20873 df-nei 20950 df-lm 21081 df-haus 21167 df-fil 21697 df-fm 21789 df-flim 21790 df-flf 21791 df-cfil 23099 df-cau 23100 df-cmet 23101 df-grpo 27475 df-gid 27476 df-ginv 27477 df-gdiv 27478 df-ablo 27527 df-vc 27542 df-nv 27575 df-va 27578 df-ba 27579 df-sm 27580 df-0v 27581 df-vs 27582 df-nmcv 27583 df-ims 27584 df-ssp 27705 df-ph 27796 df-cbn 27847 |
This theorem is referenced by: pjhthlem2 28379 |
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