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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 2821 | . 2 ⊢ (IndMet‘𝑈) = (IndMet‘𝑈) | |
9 | eqid 2821 | . 2 ⊢ (MetOpen‘(IndMet‘𝑈)) = (MetOpen‘(IndMet‘𝑈)) | |
10 | oveq2 7164 | . . . . 5 ⊢ (𝑗 = 𝑦 → (𝐴𝑀𝑗) = (𝐴𝑀𝑦)) | |
11 | 10 | fveq2d 6674 | . . . 4 ⊢ (𝑗 = 𝑦 → (𝑁‘(𝐴𝑀𝑗)) = (𝑁‘(𝐴𝑀𝑦))) |
12 | 11 | cbvmptv 5169 | . . 3 ⊢ (𝑗 ∈ 𝑌 ↦ (𝑁‘(𝐴𝑀𝑗))) = (𝑦 ∈ 𝑌 ↦ (𝑁‘(𝐴𝑀𝑦))) |
13 | 12 | rneqi 5807 | . 2 ⊢ ran (𝑗 ∈ 𝑌 ↦ (𝑁‘(𝐴𝑀𝑗))) = ran (𝑦 ∈ 𝑌 ↦ (𝑁‘(𝐴𝑀𝑦))) |
14 | eqid 2821 | . 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 28660 | 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 3138 ∃!wreu 3140 ∩ cin 3935 class class class wbr 5066 ↦ cmpt 5146 ran crn 5556 ‘cfv 6355 (class class class)co 7156 infcinf 8905 ℝcr 10536 < clt 10675 ≤ cle 10676 MetOpencmopn 20535 BaseSetcba 28363 −𝑣 cnsb 28366 normCVcnmcv 28367 IndMetcims 28368 SubSpcss 28498 CPreHilOLDccphlo 28589 CBanccbn 28639 |
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 2793 ax-rep 5190 ax-sep 5203 ax-nul 5210 ax-pow 5266 ax-pr 5330 ax-un 7461 ax-inf2 9104 ax-cc 9857 ax-cnex 10593 ax-resscn 10594 ax-1cn 10595 ax-icn 10596 ax-addcl 10597 ax-addrcl 10598 ax-mulcl 10599 ax-mulrcl 10600 ax-mulcom 10601 ax-addass 10602 ax-mulass 10603 ax-distr 10604 ax-i2m1 10605 ax-1ne0 10606 ax-1rid 10607 ax-rnegex 10608 ax-rrecex 10609 ax-cnre 10610 ax-pre-lttri 10611 ax-pre-lttrn 10612 ax-pre-ltadd 10613 ax-pre-mulgt0 10614 ax-pre-sup 10615 ax-addf 10616 ax-mulf 10617 |
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 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-reu 3145 df-rmo 3146 df-rab 3147 df-v 3496 df-sbc 3773 df-csb 3884 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-pss 3954 df-nul 4292 df-if 4468 df-pw 4541 df-sn 4568 df-pr 4570 df-tp 4572 df-op 4574 df-uni 4839 df-int 4877 df-iun 4921 df-iin 4922 df-br 5067 df-opab 5129 df-mpt 5147 df-tr 5173 df-id 5460 df-eprel 5465 df-po 5474 df-so 5475 df-fr 5514 df-we 5516 df-xp 5561 df-rel 5562 df-cnv 5563 df-co 5564 df-dm 5565 df-rn 5566 df-res 5567 df-ima 5568 df-pred 6148 df-ord 6194 df-on 6195 df-lim 6196 df-suc 6197 df-iota 6314 df-fun 6357 df-fn 6358 df-f 6359 df-f1 6360 df-fo 6361 df-f1o 6362 df-fv 6363 df-riota 7114 df-ov 7159 df-oprab 7160 df-mpo 7161 df-om 7581 df-1st 7689 df-2nd 7690 df-wrecs 7947 df-recs 8008 df-rdg 8046 df-oadd 8106 df-er 8289 df-map 8408 df-pm 8409 df-en 8510 df-dom 8511 df-sdom 8512 df-fin 8513 df-fi 8875 df-sup 8906 df-inf 8907 df-pnf 10677 df-mnf 10678 df-xr 10679 df-ltxr 10680 df-le 10681 df-sub 10872 df-neg 10873 df-div 11298 df-nn 11639 df-2 11701 df-3 11702 df-4 11703 df-n0 11899 df-z 11983 df-uz 12245 df-q 12350 df-rp 12391 df-xneg 12508 df-xadd 12509 df-xmul 12510 df-ico 12745 df-icc 12746 df-fl 13163 df-seq 13371 df-exp 13431 df-cj 14458 df-re 14459 df-im 14460 df-sqrt 14594 df-abs 14595 df-rest 16696 df-topgen 16717 df-psmet 20537 df-xmet 20538 df-met 20539 df-bl 20540 df-mopn 20541 df-fbas 20542 df-fg 20543 df-top 21502 df-topon 21519 df-bases 21554 df-cld 21627 df-ntr 21628 df-cls 21629 df-nei 21706 df-lm 21837 df-haus 21923 df-fil 22454 df-fm 22546 df-flim 22547 df-flf 22548 df-cfil 23858 df-cau 23859 df-cmet 23860 df-grpo 28270 df-gid 28271 df-ginv 28272 df-gdiv 28273 df-ablo 28322 df-vc 28336 df-nv 28369 df-va 28372 df-ba 28373 df-sm 28374 df-0v 28375 df-vs 28376 df-nmcv 28377 df-ims 28378 df-ssp 28499 df-ph 28590 df-cbn 28640 |
This theorem is referenced by: pjhthlem2 29169 |
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