Integration by Parts for D K
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1 Itertol OPEN ACCESS Jourl Of Moder Egeerg Reserc IJMER Itegrto y Prts for D K Itegrl T K Gr, S Ry 2 Deprtmet of Mtemtcs, Rgutpur College, Rgutpur-72333, Purul, West Begl, Id 2 Deprtmet of Mtemtcs, Ss Bv, Vsv-Brt, Stet West Begl,Id I PRELIMINERIES Let f e rel vlued fucto defed o set E Let c, d E, c d, d 2 te oscllto of f o [ c, E of order s defed to e O f,[ c, E sup d c[ f, c, x, x2, x, were te sup s te over ll pots x,x,x o 2 - [c, E d [f,c,x,,x, represets te - t order dvded dfferece of f t te + pots c,x,,x -,d Te we vrto of f of order s defed s follows, V f, E sup O f,[ c, d ] E were te sup s te over ll sequeces {c,d } of o overlpg tervls wt ed pots o E Te f s sd to e of t vrto te wde sese f V f, E d t s wrtte s f BV E Te fucto f s sd to e t solutely cotuous o E f for y 0 tere s 0 suc tt for every sequece of o overlpg tervls c,d wt ed pots o E d wt d c we ve ABSTRACT: I ts per we ve defed D tegrl d proved te tegrto y prts formul Key Words d prses: Asolutely Cotuous fucto, Geerlsed solutely cotuous fucto, Dejoy tegrto 2000 Mtemtcs suject Clssfcto: Prmry 26A24 Secodry 26A2, 26A48, 44A0 O f,[ c, d ] E d we wrte t s f AC E Te fucto F s sd to e geerlsed solutely t cotuous resp of geerlsed ouded t vrto o E f E E were ec E s closed d f AC E resp f BV E for ec d we wrte t s f AC GE resp f BV GE II AUXILIARY RESULT Followg result wll e eeded wc re proved [2] Lemm 2 Let E e closed set Te f ACGE resp f BVGE f d oly f every closed suset of E s porto o wc f s AC respbv Lemm 22 Te clsses of fuctos AC E,BV E,AC GE,BV GE re ll ler spces Teorem 23 If f BV E of f Teorem 24 Let 2 d te f f :[, ] R e suc tt exsts ftely e o E, were f s repeted proxmte dervtve Te reserc wor of frst utor s fclly supported y UGC, MRP 2 Correspodg uter IJMER ISSN: wwwjmercom Vol 5 Iss J 205 6
2 Itegrto By Prts For D K Itegrl f ACG[, ] D[, ] f exsts [,] 2 f for r=0,,,-2 d x, oe of f r + 'x d fr - 'x exsts te fr 'x exststs codto s weer t te smootess codto of f r v f 0 e Te f - exsts d s odecresg [,] d f AC [, ] Te followg teorem s proved for =2 Teorem-4 of [2], d smlrly c e proved y Teorem 25 Let F d G e AC respbv o E Te FG s AC respbv o E Te FG s AC respbv o E Corollry 26 If F d G re AC G respbv G o [,] te FG s so [,] Te proof s smlr of te corollry of Teorem-4 of [2] A fucto :[, ] R suc tt f AC G[, ] 2 exsts [,] III THE D INTEGRAL f :[, ] R s sd to e D tegrle o [,] f tere exsts cotuous fucto r s smoot, for r=0,,,-2, v,, exsts d,, f e [,] Were d deote rgt d proxmte dervtve of t of order - d left d proxmte dervtve of t of order - Te exstece of e [,] s gurteed y Teorem-23 Te fucto f exsts s clled t prmtve of f o [,] If D tegrl of f d,, F F s clled te defte D tegrl of f over [,]d s deoted y F we cll F to e defte D ftdt Te defte D tegrl s uque y Teorem-24 Te defte D tegrl s uque upto ddtve costt d te t prmtve s uque upto ddto of polyoml of degree - Teorem 3 Let f e D tegrle o [,] d o [,c] d let d e t prmtves of f [,], d [,c] respectvely If, d exsts te f s D tegrle [,c] d c c D f+d f=d f,, Proof: Sce d exsts, te prevous dervtve exsts some left d rgt egourood of Let IJMER ISSN: wwwjmercom Vol 5 Iss J
3 Itegrto By Prts For D K Itegrl Te H s cotuous [,c] We sow tt H s te t prmtve of f [,c] Clerly H AC G[, c] Also for 0 r 2, H r x Ad ece H exsts [,c] We re to sow tt 2 H s smoot t for 0 r 2 Let 0 d 0 r 2 Te r r r r r r r H H 2H H H H H r r, r, r r, r, O r, r, Te frst term teds to 0 So r r, r, d te secod term teds to s r H s smoot t for 0 r 2 Hece H r x s smoot o,c for 0 r 2 Te proof of oter propertes of t prmtve re esy Hece H s te t prmtve of f o [,c] So f s tegrle o [,c] Also D c f H { {,,, c H D f D,,, c f c} { } {,, c,, } } Teorem 32 Let f e D tegrle [,] d let <c< Let te t prmtve of f [,] If c exsts te f s D tegrle o [,c] d o [c,] d c c D f+d f=d f Te proof s mmedte Teorem 33 Let f d g e D tegrle [,] d, re costts te f g s D tegrle [,] d D f g D f D g D IJMER ISSN: wwwjmercom Vol 5 Iss J
4 Itegrto By Prts For D K Itegrl Te proof follows from te defto of te tegrl d Lemm 22 Teorem 34 If f e D tegrle o [,], te f s mesurle d fte e o [,] Proof: Sce f s r D tegrle o [,], tere s cotuous fucto AC G[, ] suc tt r s smoot for r,2, 2 d f, e o [,] Let [,]= E, were E s closed d s AC o E for ec Let E P D were P s perfect d D s coutle Sce AC G E, ACG D d so y Teorem-6 of [3], s AC o P were te dervtve s te wt respect to P Let x x for x P d e ler te closure of ll tervls cotguous to P Te BV [, ] d so exsts e o [,] Also f x x e E Sce dervtve of fucto of ouded vrto s fte e d mesurle, f s fte e d s mesurle o E for ec Te rest s cler Teorem 35 If f s D tegrle d f 0 [,], te f s Leesgue tegrle d te tegrls re equl Proof: Let e te t prmtve of f So f 0 e [,] Te from Teorem-24, exsts d s odecresg [,] d [ AC, ] Hece exsts e [,] d s Leesgue tegrle [,] Hece f s Leesgue tegrle [,] Teorem 36 Itegrto y prts Let f :[, ] R s D tegrle [,], F e ts defte D tegrl d F s D tegrle Let G - e solutely cotuous [,], te fg s D tegrle [,] d D fg [ FG] D FG Proof: Let e te t prmtve of f [,] Let x xgx, x [, ] Te sce for r=0,,,-2 d G - r exsts ftely so s smoot for r=0,,,-2 Sce G - s solutely cotuous,g s AC [,] d sce s AC G [,] Ad e [,] r So G Let G G c G c G c G G FG fg FG fg s D 2 H x G c G G 2 tegrle [,] Te smlr wy s tt of Teorem-4 of [] t c e proved tt H ACG [, ] Ag sce d G exsts e [,],we ve, H x G c c G G 0 = G c G FG G r s smoot So G c G FG s D tegrle [,] d so D tegrle d H s defte D tegrl Sce F s D tegrle d G s solutely cotuous [,], FG s D tegrle y Teorem25p246 of [4] d ece FGs D tegrle [,] Ag sce, G c G FG fg, G c G FG d FG re D tegrle, y Teorem33, fg s D tegrle [,] d IJMER ISSN: wwwjmercom Vol 5 Iss J
5 Itegrto By Prts For D K Itegrl D fg D = = G c G FG fg D G c G FG D FG [ D FG ] [ H] 2 2 G c G G FG] [ 2 2 c G G [ G ] D FG = [ FG] D FG REFERENCES [] SNMuopdyy d SKMuopdyy,"A geerlsed tegrl wt plcto to trgometrc seres" Alyss Mt, [2] S N Muopdyy d S Ry, "Geerlsed Asolutely t Cotuous Fucto" Id Jourl of Mtemtcs, Vol 53, No [3] SKMuopdyy d SNMuopdyy,"Fuctos of ouded t vrto d solutely t cotuous fuctos" BullAustrlMtSoc 46992,9-06 [4] SSs,"Teory of te tegrl",dover,newyor937 IJMER ISSN: wwwjmercom Vol 5 Iss J
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