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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 2823 | . 2 ⊢ (IndMet‘𝑈) = (IndMet‘𝑈) | |
9 | eqid 2823 | . 2 ⊢ (MetOpen‘(IndMet‘𝑈)) = (MetOpen‘(IndMet‘𝑈)) | |
10 | oveq2 7166 | . . . . 5 ⊢ (𝑗 = 𝑦 → (𝐴𝑀𝑗) = (𝐴𝑀𝑦)) | |
11 | 10 | fveq2d 6676 | . . . 4 ⊢ (𝑗 = 𝑦 → (𝑁‘(𝐴𝑀𝑗)) = (𝑁‘(𝐴𝑀𝑦))) |
12 | 11 | cbvmptv 5171 | . . 3 ⊢ (𝑗 ∈ 𝑌 ↦ (𝑁‘(𝐴𝑀𝑗))) = (𝑦 ∈ 𝑌 ↦ (𝑁‘(𝐴𝑀𝑦))) |
13 | 12 | rneqi 5809 | . 2 ⊢ ran (𝑗 ∈ 𝑌 ↦ (𝑁‘(𝐴𝑀𝑗))) = ran (𝑦 ∈ 𝑌 ↦ (𝑁‘(𝐴𝑀𝑦))) |
14 | eqid 2823 | . 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 28662 | 1 ⊢ (𝜑 → ∃!𝑥 ∈ 𝑌 ∀𝑦 ∈ 𝑌 (𝑁‘(𝐴𝑀𝑥)) ≤ (𝑁‘(𝐴𝑀𝑦))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1537 ∈ wcel 2114 ∀wral 3140 ∃!wreu 3142 ∩ cin 3937 class class class wbr 5068 ↦ cmpt 5148 ran crn 5558 ‘cfv 6357 (class class class)co 7158 infcinf 8907 ℝcr 10538 < clt 10677 ≤ cle 10678 MetOpencmopn 20537 BaseSetcba 28365 −𝑣 cnsb 28368 normCVcnmcv 28369 IndMetcims 28370 SubSpcss 28500 CPreHilOLDccphlo 28591 CBanccbn 28641 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 ax-rep 5192 ax-sep 5205 ax-nul 5212 ax-pow 5268 ax-pr 5332 ax-un 7463 ax-inf2 9106 ax-cc 9859 ax-cnex 10595 ax-resscn 10596 ax-1cn 10597 ax-icn 10598 ax-addcl 10599 ax-addrcl 10600 ax-mulcl 10601 ax-mulrcl 10602 ax-mulcom 10603 ax-addass 10604 ax-mulass 10605 ax-distr 10606 ax-i2m1 10607 ax-1ne0 10608 ax-1rid 10609 ax-rnegex 10610 ax-rrecex 10611 ax-cnre 10612 ax-pre-lttri 10613 ax-pre-lttrn 10614 ax-pre-ltadd 10615 ax-pre-mulgt0 10616 ax-pre-sup 10617 ax-addf 10618 ax-mulf 10619 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ne 3019 df-nel 3126 df-ral 3145 df-rex 3146 df-reu 3147 df-rmo 3148 df-rab 3149 df-v 3498 df-sbc 3775 df-csb 3886 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-pss 3956 df-nul 4294 df-if 4470 df-pw 4543 df-sn 4570 df-pr 4572 df-tp 4574 df-op 4576 df-uni 4841 df-int 4879 df-iun 4923 df-iin 4924 df-br 5069 df-opab 5131 df-mpt 5149 df-tr 5175 df-id 5462 df-eprel 5467 df-po 5476 df-so 5477 df-fr 5516 df-we 5518 df-xp 5563 df-rel 5564 df-cnv 5565 df-co 5566 df-dm 5567 df-rn 5568 df-res 5569 df-ima 5570 df-pred 6150 df-ord 6196 df-on 6197 df-lim 6198 df-suc 6199 df-iota 6316 df-fun 6359 df-fn 6360 df-f 6361 df-f1 6362 df-fo 6363 df-f1o 6364 df-fv 6365 df-riota 7116 df-ov 7161 df-oprab 7162 df-mpo 7163 df-om 7583 df-1st 7691 df-2nd 7692 df-wrecs 7949 df-recs 8010 df-rdg 8048 df-oadd 8108 df-er 8291 df-map 8410 df-pm 8411 df-en 8512 df-dom 8513 df-sdom 8514 df-fin 8515 df-fi 8877 df-sup 8908 df-inf 8909 df-pnf 10679 df-mnf 10680 df-xr 10681 df-ltxr 10682 df-le 10683 df-sub 10874 df-neg 10875 df-div 11300 df-nn 11641 df-2 11703 df-3 11704 df-4 11705 df-n0 11901 df-z 11985 df-uz 12247 df-q 12352 df-rp 12393 df-xneg 12510 df-xadd 12511 df-xmul 12512 df-ico 12747 df-icc 12748 df-fl 13165 df-seq 13373 df-exp 13433 df-cj 14460 df-re 14461 df-im 14462 df-sqrt 14596 df-abs 14597 df-rest 16698 df-topgen 16719 df-psmet 20539 df-xmet 20540 df-met 20541 df-bl 20542 df-mopn 20543 df-fbas 20544 df-fg 20545 df-top 21504 df-topon 21521 df-bases 21556 df-cld 21629 df-ntr 21630 df-cls 21631 df-nei 21708 df-lm 21839 df-haus 21925 df-fil 22456 df-fm 22548 df-flim 22549 df-flf 22550 df-cfil 23860 df-cau 23861 df-cmet 23862 df-grpo 28272 df-gid 28273 df-ginv 28274 df-gdiv 28275 df-ablo 28324 df-vc 28338 df-nv 28371 df-va 28374 df-ba 28375 df-sm 28376 df-0v 28377 df-vs 28378 df-nmcv 28379 df-ims 28380 df-ssp 28501 df-ph 28592 df-cbn 28642 |
This theorem is referenced by: pjhthlem2 29171 |
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