Ific dO hOi ty.
Trang 1n rr
I E 383 3S0 3E) 3 » 3 » a m 3 » i © 2 f f l jeo 3 » 3 » 3 » aro 3 » 39D s o 360 3 © 3fiO 3 » 3 K a » 3 e 0 3 » 3«^
BO mi mo VA 'x'^UITG IDC CHUYEN NCaHiiP
Trang 2SxmsjL
PhSn loo' dSu 3 Chifo^np: n 5 t : I*i§t sfi ptocme; phap n£i sijy t t ^ e n t i n h
d5 g i a i 6§ja dung phuPcmg t r i n h toan ti^
S 1 M§t v a i k h a i nigm vo ty sal phan syy r^ng cho
§ 5 M§t v a i tn^cfr^'hgj? dglc MJ^t cua phop 1$P ( 2 9 ) 52
§ 4 V5 in§t logii phuctog phq? l§p b^c cao thrf h a i
do g i S i gSn dung phifcmg t r i n h to5n ti> • 37
C^^ctofa: haj 5 M$t v a i phi:?cmg phap ngi suy tSng qu5t
svQT T§ng d | g i a i gin dung phtfcmg t r i n l i tofin tiJ
g o D^t v8n etS 45
i 1 M§t v a i kiaai nlga ve cSng thrJo n§i suy Tfiu-tcm
si^y rOng i^
§ 2 "VS ffiOt v a i pbucng phSp n§i s^y tong quat s i ^
rgng g i a i gSn dung phu^c?ng t r i n h t o a n tiJ va
si; h $ l t v cua n6 • • • ^
Gfaifgya;;!^ l?a t Ph8n iJng d^ng
i 1 Mgt s5 T^ag d\wig cho 3191 v a i to^n ti> cy thS 61
1.1 Phi?c?n6 t r i n h haci thi/c vo^ b i § n s8 thi;c 61
1^2 H$ phtfc^ng t r i n h dgii sfi p h i tuySn hc$c
siSu v l ^ t 62 1.5 Phi^c^ng t r i n h t i c h phan p h i txo^Sn G5
i 2 CSc v i d\i bang 06 68
Tai l l § u t r i c b dan 70
o£o
Trang 3T l f c i5ng dyng g i a i t i c h ham ^to n g h i e n C'\i c i c ph'.^'ng phap g i a i gan dung c a c l o p i phi?o'nc t r i n h n g t c5ch tong q u i t
da dem i Q i n h i e u k e t qua v6 cung quan trgni^ '2u» ti^o'nt; cua
g i a i t i c h ham khong nhu^ng cho phep dcn [^Inn hoe each n h i n
cho n h i e u phUHo'ng phfip k h a c nhau ma eon giup t a ki^m t o a n
m i o u GO' do t i n h t o a n t r o n g nhiou l i n h vy^c khoa hgc k h a c nhau,
•vf dy nhu^ dpi s5 t^iySn t i n h , phu'C^ng t r i n h v i p h a n , phutmg
va CO g i a t r t t r o n g mgt khong i;ian cung l o ^ i
DS g i a i gan dung phu^c-rig' t r i n h ( 1 ) ngi;?o'i t a dung n h i e u phi?o'ng phap k h £ c nhau L.oi phv.Xi^r^'; phap dou oo nhu'ng 'J*ii (Tien
va nhu-ng hgin che n h a t d i n h 2n?o'ng hg»p A l a t o a n tu' t u y 3 n
t i n h , c a c k e t quo ve g i a i ;;Sn dmux, da duvc :<Qt g5n nhu* t r g n
v g n Vol A khong t u y o n t i n h , v§n do mc'i chi duvc z<6t cho t i m g trj'c^ng hg^ r i e n g , chang hgn l o p t o o n tu t h a t , loip t o a n tu (to»n dipu v.^-" ••
Trong nhiJng nam gan dixy n h i o u cuSn each chuyen khao
da do cfp o ^ t each dang kt t o i nh5ng phuxmg phSp t o n g ( l u a t ,
Chang h ? n , c5c t a i l i f n i cua Gang to r6 v l c h / " ^ t ^ - ? * ® l a t x
Trang 4Chu-^ng 1 t r i n h bay mgt Q6 cac phiAD'ng phap n g i cuy
t u y e n tfnh dS g l M gSn d'ms phuv^ng t r i n h t o a n ti ( 1 ) Thi/c
r a phuang t r i n h ( 1 ) da '*u^c nhiou t ^ c g i o n g h i o n oS\ \ni <^xx^n
r a n h i e u phutJ'ng phop k h a c nhau nhu^' phuvng ph%> Niuto^n C^^'^J*
p h w n g phap S t e f f e n x e n - Aitt:en £ ^'y^ ^'^ J ^ phu\>'nu: phap l^p clip k tong q u a t (phut^ng phap Sruede - Tsobu'sep) /f 1 5 ; 27 J - • • y
t r o n g s6 do phuang phap r i u t c n - ' - i n g t o r o v l c h t-uy di.;vo su'
ct\mg i ^ n g r o i , nh>mg nhuyc diem chinh l a t r o n g n h i S u tru?o»ng hgj) v i t ; c x a c ^ n h toi'n ti> ^ A x J " ^ (d^o ham t h e o P r e s o ) thu^'n^i
^gp kho khan v-o ph'^e t ^ p ITgoai ra t r o n g n g t G6 tr-fo'ng hgp
Cvl dy k h i t^iei c<ac b a i t o a n b i e n p h i tuySn ^6i vti h$ ohu'd'ng
t r i n h \d phfm) cong thi?c h l ^ cua Ax khong t h e b i S t tru'iS'c
mo chi b i S t cTuvc t h u 0 t t o a n t r ? n nay t l n l i d i f n tu' vpn nang
de x a c cT4.nh g i a tr% Ax^^ va v^ t h 3 khong t h e op dyn^j dug'c
phv?o^ phap TUu-to'n
Di;'a vao k h a i niv'ia t y sax p h a n stjy rQng cho t o 5 n ti
t r o n g nhu'ng nhjsi gan day cac con^ tA.nh cua / " 1 1 - 1 3 ; 2 2 - 2 3 7
da l a n lirg^t xuSt hii^n nh?aa k h l e phyc nhu^ng nhu^c d-icm t r e n ,
nhfj?r4g -oSc ilg h g i t y cua cac phu'r;ng phap do chu*o vxf.gt qua t S c
d§ h g i t y cua phuc?ng phap T'iiT-tCn
l ^ n g chuttog nkj chx'jig t o i nSu r a mgt B6 phuNj'ng phap
CO t i n h chSt n g i suy tuyen t i n h Cac phii'O^ng phop nay khong
nhu'ng t h u g t t o a n do?n g i a n ma t 5 c dg h g i t-y l ^ i c a o , chung t o
r a dgc bi^^t t i g n I g l t r o n g truVng hg^) t o a n tu' A co dsua haa
phiJc tjip hogic khong k h a v l
Chi?c^ng h a i t r i n h bSy mgt s6 cac phut)*nc; phap n g i Bvxy
t 6 n g q u a t suy r g n g cho toon t&* PhSn d2u t i e n cua chu'c^ng nay
l a dUB TV coc k h S i n i p n ve 1^ s a i p h a n suy r g n g 'oong q u a t cho
t o i^n tl? va c a c cong thi^c n g i sy^^ U i u - t e n t o n g q u a t S"uy rgng cho toSn tu' t r e n khong g i a n Banach PhSn t i e p t h e o l a x£y dijPng
x^t Q6 phut^'ng phap ao nh5ng phuang phap nay bao gSn ragt so
Trang 5k e t qiTO c^'ia ch'.;x»'ni3 I va cua coo t o e g i a k h a c
L:5i p h u a n g phap 6" cb^Mn^ T cTuig nhi," & c h w n g TT ^eu
dxjt^o khao B:OZ qtia cac phSn 5
- ilgi dung phittrng phap
- S^ h g i t y
- Gong th-^c danh g i a s a i s6 (Xem c5e c^nh l y : 2 1 ; :i:.2; 2.35 2.45 2 2 ' t 2 5 ' ; 2 2 " ; 2 5 "
§ 2 chux^ng I , 5 1 ; 5 - 2 ; 5-;^; 3«4; 5 o S 5 cht:c'ng T, 4 1
g 4 c h m n g I 2 1 ; 2 2 ; 2 5 0 2 chi.?o'r^' I T )
ChL?o'*ng ba (phan iJng dyng)
khao c a t ngt; oS v'nx: ^yng cua cac pht!t?ng phnp o' di^x^nz 1 va
chi't5»ng TI cho m^t so t o 5 n ti*? cy t h e ; ITeu l e n t h u g t t o a n , d i e u
k i ^ n h g i t \ i , cong thu'c canh g i a s a i so cho t o a n tu' dang khao
s a t C-^o^ cac d^nh l y t L i ; 1.2 § 1 chuWo^^ b a )
Phan cu^i cung ci^o ch*:'c?ng nay l a nigl v a i v l dy b a n g
28 do k i e n nghii^m c a c phuc?ng phap neu r a
C/Xic k e t qua ohlnh c»^a Ir^/n v l n dn dirg'c r a i r o c boo cao
t r o n g cac b u o i s i n h h c p t x6-iai-na "Cac phuti*ng ph&p gl.al gan dung ^.ihu^i'ng t r i n h t o a n ti" vh nhu*ng ftxg dyng cu.a chnng" cua
to bO ^5n 'Doan hgc vinh t o a n , khoa 'Joan ir.>?o'ng Bjii h g c l o n g hfi'p "^a-ngi l';?76 va ia$t oh'&n da dug^c cong b6 t r o n g / " 5 5 - 5 5 7 »
Tac g i a x i n chan thanh can o'n dor^g c h i -"oang dll'c ITgijye]
da dgc k y lu'^ng ban tiiao va cho n h i e u y k i e n dong gop q u i ban Dgic bi^^t, t a c g i a x i n chan thanli c^:a o'n d3ng c h i Phan van ^^p
da da x u a t ^phucfxux; hu'o'ng, da cho n h i e u y k i ^ n dong gop q u i b a n
t r o n g c5 qua t r i n h hoan thanh b a n l u g n v2.n n a y
Trang 6Cn'^^^n^-^; I
IE Cg-AT GAN DTTITG PHHONG 'H^lTii lOAN l^T
PJxao s a t phi?o»ng tri.nh to5n t\^
-( 1 ) • Ax ^ 0 ,
t r o n g ro A l a t o a n tu" p h i IrL^on anh x^ ingt inien l o i ^TL nho
do c\ia khong g i a n Banaeh X vao n g t khong g i a n cung l o ^ i i
Gia t h i e t r a n g A kha v i th^»o P'rOsG va TL lo nghicm dune cua ( 1 ) t r o n g l a n ojn iTIi
§ ^ • ^'-9t v a i k h a i n i g n ve t y s a l phC^n suy r ^ n g ^'-]0
t o a n tu" ( : ^ m ^ 5 l 7 ) * ^
Xot n g t ham tr\i t':Vng Ax, han nhy chTij^'n khong g i a n
d5.n!i chuan X vao khong g i a n dj.nh ehu*n ! ,.-^,-"
Trang 7* ( i " 0 , 1 ) iltWig ty:, p h s n ti> cua B^.^ di^vc -^rio-i; dL^'c'l djing
( X Q , X T _ , , :5C^„-()» "^^ ^ 1 ^ ^ " ' ^^ ^ c T l ^ )
Gia ^ tBn t f i ngu h^a tr*a: ui^ijr'ng A(x^, :^:^), han nay chuyen nhiJng ph3n tu' cua khong g i a n Z-, vho nhSn;: phan txf cua khong g i a n f x - ^ l j , tron^ Co >^ e X, ( i ^ 0 , 1 )
D6i v c i nhu'ng -xyYian x,-^^ x^ , ( i = 0 , 1 ) , o5 d3.rih t n ? n g X
j o i v(?i c5c phSn ti: x ^ , ( i = 0 , 2 ) o5 ^^nh t^x^ng X t h i A(x , X | , Xp) l a n g t t o a n tu LzonQ tuySn l a n h
Toan tl? so.ng- tuy-Sn t i n h ACX^, :20: , s>^) t h o a nan *iou
k i g n ;
( 1 2 ) ACx^, x ^ , x^) (x;^ - 3ii) ^ A ( X Q , X;^) - A ( X Q , X ) ,
d i ^ c ^ i l a t y s a i phan b-v^c h a i cua han trOYi tJ'g'ng Ax i S y t g i cac phSn tir x^ ^ X, ( i = 0 , 2 )
Trang 8Feu A t o n t g i cac r^go han l i u n t y e don bgc 1: ( t h o o r eae) t h i
cac t y col phan xac d^n^ nho' coc t i c h p h a n 'Urjan tru^i tii'g'ng,
Trang 9De den gian, t^:- day vo sau se ky hi^^u :
^01 k ^ ''^^^o' ^^•••» -^1:^
^Jo1 k = ^^^' ^^o' ^^l' -' ^1:^
§ 2 Ve mot ohUD^'A ohao 1 5 P bg.c k do f:±a± ;-an dnj\p;
Phu^tyng t r i n h toan ti? Cl)
Xu3t phat tiJP gia t r i ban dau yP du gan x^, t a x§y di/ng
c§c phSn t i theo each sau s
Trang 10L'^t khac, cung d^a vao dj.nh nGhia cua ty s a i phan suy r9ns
b | c k dio toan ti? va dieu ki^>n ( 2 2 ) t a I p i co :
+ f- A 0 1 Q ( k - D ^ ( x - x ? ) ( x - s g _ ^ )
Ti> ( 2 4 ) va ( 2 3 ) t a suy r a rang vo'i \ / x € i Q g ^ C i i ^ ^
t r c n g fid 5
^ g j = i X : l | ' £ x ° ( x - x ^ ) ^ ° | / ^ |)A2t>1„ (k-1)J( n ^ ))x-x°|| f
Trang 11k
(ic) B§t dang thi5c t r o n g LQ* co nang t i n h ch3-c d}.nh t i n h n h i e u
hd»n l a djnh lijg'ng VSn do d-^t ro lt>, co t^n t ? l cae phSn
tii X ^ u 2J gS , sao cho thoo n a n ( 2 6 ) khon^:^* ? 'Tay
n o i each k h a c can chgn [fh^o l a k h a c t r S n g l l i g t v g y , do
Trang 12t o 00 :
( 2 6 ) Ax - Ax^ - To,k ( x - x ^ ) = " ^ — ^ Ax^1 (k-^ )^ Cx-x^)
XSp x i Ax bang da th'?c taiyen t i n h <:io(x) :
t r o n g do 0^ nhgn d^rg'^ tu G^ bung each thay c a c s8 hgng
Q ( k - D ^ b?ir^- A O I Q k^
CO chu^a Axo1- ( k - 1 )_ bar^- A o l - , k ^
Tic ( 5 ^ ) t a s e x a c djnh duVc cZ
Trang 13t h i l y l u g n hoan t o a n tit^ng tg' nhti* t r e n t o GO C6 :
Tl) ( 2 8 ) sijy ra qna t r i n h Igp :
t r o n g d6 ^ duVc xoc d^nb ti^'o'nG ti;' nhir ^ t r o n i j ( l ' i - )
i^p dyng cone; thu'c ' l a y - l o co p h a n dir cho t o a n tiV £"1v_7 ( 2 1 2 ) Ax^ = A(x* + x " - x^) =
= Ax* ^ ^ iL^(x-^ _ ^f , ^(^^^ ^ ) ,
1=1
Trang 14Keu xap XI ban '^au x° t h o a niin c a c d i e u ki^in :
1 ^ / l o a n tu* AO1Q t o n t a i toan uJ nijhjch dao Aol^^ va
IIAOIOII 4 Boj
2 ° / | | A o ( k - i ) ^ | i < L^, (^i = 1 , k - 2 ) ;
3 ° / Cac h a n s s6 Bo, L,, th.oa nlin b a t dSnfj thifc
Trang 15The nhu^ng, di;a \^ao c5c g i a t h i o t c^ja dxlrin Tj t a co
11 A?!,"? (-O'"^^-"^ 4.^ Ao(^-i)o
" i=1
Dya vao d5.nh l y Banach, tu' uSt dang thu^c cu.6i cun;j suy ra
t o n t ? i t o a n ti? nghich dao :
- 1 ^Zf i - ( k - 1 ) ^ v-1 ^
( l + A0I3 £ ( - 1 ) -i^^T -'io(i^-^)J) V'^
-1 ^ J ^ l - ( k - 1 ) -1,1 ^
( | ( l + A o 1 o } _ ' ( - 1 ) t.5_^ A o ( k - i ) o ) \\ ^ - 1 - •
Trang 16- 1 1 -1
Do do t o a n ti nghi eh ^^^o l-o,!: t o n t ? i va l|l'o,k \\ 4: - ^
Gia su' :
1 ° / ifin t j i t o a n f'^ nGhich dao in,!:: va 1| % , ! : |l 4 B;
2 ' ' / l u i ^ ^ l U ^ ^k ' x " € ^ v ' l V n
Lhl do qu5 t r i n h Igp ( 2 y ) GO !^;i "cy t o i n-ghl^^n x"^ cri.a (1 )
l o e dg hgi ty d-u<;^c :-*anh gi.a bang b S t dang thu'c :
Trang 17Thay (2.17) vao ( 2 1 9 ) ta nh^n :
k_-1
x ^ ^ ' ' - X* I k II Tn'k 1! l l ' I n , k ( x ^ - ^ ) - i : - ^ 7 A x - ( ^ - ^ ) ' l l +
i=1 1 ' -1
* II I^ik II II \ ( ^ ^ ) I) •
Dya vao cac dieu k i p n ciia d^nh l y va c5c bSt dang thu*c ( 2 1 8 ) ,
( 2 1 1 ) , tii* b a t dong thu'c cu5i cung suy ra dieu p h a i c^iihig
minh I^u khdng gi5 t h i e t trx^&o ve ay.' tSn t ^ i n g h i ^ cua
phi?cmg t r i n h ( 1 ) , ta co cac dinh l y sau day «
Dinh l y 2 ?
Gih sv? X thoa nan cac dieu k i y n :
1^/ Toan tiJ To,k tSn t g i toan tu' nghidi dao To,k
-1
va fJTo,k ll - 4 Bo ;
2^/ \\Ak iLcL^ 4 I^i f (i = ^ ) »
trong do l a n cgn liTj ^ duyc >:ac dinh ti^ ( 2 2 4 )
3°/ II To"'k Ax°|U >'^, )i:^.i - ^ _ J U >o' <i = ^ ^ ) '
4 ^ / Cac hang s8 Bo, / ^ , L^ th6a man :
Trang 18Chu'^ minh rang k h i chuyen ti? ph&n ti5= x*^ song x t h i
c a c d i e u k i g n cua dinh l y v^m cT>-?g'c b a c t o a n Do dang a-^y r o
Trang 20k>1
( 2 2 7 ) j j < i , Ax-^ll <, - ^ \ ^ , - o ^ ^ 1 ^ '
Qua n g t vai phep biSn doi dc?n gian, t'J* ( 2 2 7 ) si:ty ra !
(2.28) K ; , , Ax^ii 4 ?;^(A,^^ '1.k :o> o'' "o^
TiJP (2.50) suy ra f^ ^i^C'o^
Trang 21dinh ^<^c cac d^i li?g»ng sau day :
Trang 22Binh l y da du'o'c ch'?ng minh*
Gia siV x*^ thoa man cac d i e u k i f n cua d i n h l y 2 ^ 3 , ngoai
r a con thoa man thom :
B j j < , B v^ Vnf
k-2 J^— \ *'" ~i
(i-i>««ao) ^
Trang 23Ehi do t r o n g l a n c?.n J
se cht?a duy nhSt m§t n g h l ^ a r cua p h i r c ^ t r i n h (1)*
Bang phifc^ng phap phan chi'hag, t a gia su* rang trong l a n
c§n , ^^ ngoai x , ph:/o*ng t r i n h (1) eon ton t$± mgt nghigm
khac x*^ Can c^'5'ng inin^ rang x ^ trTing vt3l xT
( 2 4 0 ) y^^^^ X** = iQl^ fA:^ Ax^ - T^^^ (x*^ :,^) J
M|lt k h i c , d\fQ vao c6ng th'^c Tay-lo cd phSn diP cho
toan ti5 t s oc5 :
Trang 25-Khi cho n -ro^, tu' bSt dong th'jc cu6i cunc suy ra :
X = lim X ' - X *• t^inh l y da dug'c chu'ng min^
Trang 26va ( 2 3 ) ci'mg vc'i ( 2 4 ) t a nhi^n dang thi^c cm :
A^ - Ax°- T^^^ ( ^ - :°) = k! (t,^ A ( ^ 4 , , ^^J) ^ o
Ly lU'^n hoan t o a n tu'cng tu? nhi' ( 2 5 ) t a n^gn :
Ax - AX^ - To^K^x-x^) •-= h ! ,W^ A ( x , x ^ , , ^^^) A^c
Cung v5l bo do 1, dinh ly 2.2 va dinh ly 2.5 ta co bo de va cac dinh ly sau dSy :
Trang 27t h i v^-i x° du gSn x* qua t r i n h l&p ( 2 9 ) s i hQ± ty t o i nghipm
x^ cua phu'o'ng t r i n h ( 1 )
Ific dO hOi ty <^yVc ' ^ a ^ Si^ ^a»S I^St dang tht'-c :
CSn^ng a l n h Phep chu'ng minh dinh ly nay hoan toan tn'Cng t^? nhi? chu'ng minh dinh l y 2 2
Gia su? gia t r i ban ^au x^ thoa man :
1^/ Ton t g i to5n t& nghich d^o T^^j^ va i, TQ^J^J ^^BO ,
5'/ ii<3 ^ ^ i i ^ ^ K ^ - -k-ilU^i ' Ci = T;k7i)
4 ° / Cf'c hang 88 BQ, • Q, LJ|_ thao man cac b S t dang thi5c
Trang 28Khi d6 phuwng t n n h (1) t r o n g l a n can ^ co nf;hipE yT va qua
t i i n h l ^ p ( 2 9 ) se hvi t y tc'i nghigui (^6
T8C d9 b§i t y duVc danh g i a bang b S t dang th't-c :
Ch'ing Qinh d^nh l y nay hoan t o a n t i f o ^ ty' jihu' dinh l y 2 3
M u t a thay cac d i s u k i p n gl<5l n ^ i t h e o chui^-n cua dgo
han b i n s cac d i s u k±-^n g i o l n g i theo chuEn cua ty s a i phan v6'i
cSp ti^a»ng feg, t h i cung vtSl din.'^ l y 2 2 va 2 3 t a GO n h ^ n r*u?g>c
cac din.h l y cau :
k-2
i=1 (x-x-)
Trang 29Itfu vao Ijy higu (2#4cO tu co t i l -^IS 06: g thUC a:.: uy Iliutou
CS.»u'.j;j aiu)i t j uC iX.s/ -•;'>'•'.! > ->u.i lift".::,, tu" a;\\t ciu?u~ v i iU bd ufi i , ebi o?.ii iu:u y l\ tiuxy o.'-c tuiuc ^iVyio uo ph?.:: d'.: I:'.-; ooag -asiirc
( 2 , V ^ )
Sin?: l y g>
Gie* nf c i8u irl;n our din-: l y 2.;^ thou rati.:, ugc>fd rr
Qhx\ 'x'oa iic.xi J? "ri t
.^
V jj ixnl.^ (kHi)a jl ij^.^^
troi-^g do ''^^j^^j • • 2^ X j\ (>-*, x ^ , • • • , x ^ ^ )
-«» n ' , "V
:t3:il d o qua t r l n i t l ^ p (2*.;) se I t j i 44 tc'i ughivn :.^» 2t5c dp
i i ^ i t^i.ctUjy^ d c l : g i e u!^n'-: bflt -.^i:-; i;iii!»c s
(2.^) p ^ ' ' - : ^ , ! ^ f; 11*^.0^11 \
teo:3? do ^ j ^ - - - - P -
Trang 30Sffong c3ag i u ' : id^t) a^d u^it x = xT*, t ' BO i&(ln :
DlT vLo Cite ci«i wii3t Cua v^jh iy^ ':''- 1:SL city^ t'luc cu6i ctu:i^
Gia eii? x'' ^lOil ::&aii c i c ci?u ki^u : , v^ ' , '-*- dinli l y
1) i|7to1 • i jl J ^ 4 L^ , Cl-lT^
Trang 32Dia'i l y ney c;)u.:j i^ioti Jioeii toiu; OU:C*::G «l* -""-^i^^ ^^4-—^ i ' / '-•5»
*'}hxonix, P^^'l.: ui\y c}; -:^; u^i se 'vJ'eo seu n^u s 5 t:c'ubn^ i)q*'n
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