函数项级数一致收敛的判别法

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20099SCIENCE&TECHNOLOGYINFORMATION,,。∑an(x)I1.:{Sn(x)}∑an(x),{Sn(x)}IS(x),∑an(x)IS(x)。,,。2.()∑an(x)I:ε,N,nNx∈Ip|Sn+p(x)-Sn(x)|ε|Un+1(x)+…Un+p(x)|ε3.:∑an(x)IS(x)limn→∞supx∈D|Rn(x)|=limn→∞supx∈D|S(x)-Sn(x)|=0({Sn(x)}S(x))4.∑anI。5.∑an(x)IS(x),b(x)I,∞n=1∑an(x)bn(x)IS(x)。6.():∑an(x)I∑Mn,x∈I,|an(x)|≤Mnn=1.2……∑an(x)I。:∑Mn,,ε,N,nNp,|Mn+1+Mn+2+….+Mn+p|=Mn+1+Mn+2+….+Mn+p<ε|an(x)|≤Mn,x∈I,|an+1(x)+an+2(x)+....+an+p(x)|≤|an+1(x)|+|an+2(x)|+....+|an+p(x)|≤Mn+1+Mn+2+….+Mn+p<ε,∑an(x)I。、∑sinnxn2(-∞,+∞):x∈(-∞,+∞)|sinnxn2|≤1n2,∑1n2∑sinnxn2(-∞,+∞)7.()1,∑an(x)I;2,x∈I,{bn(x)};3,{bn(x)}I,x∈In,M,|bn(x)|M,I。:1,ε>0,N,nNp,x∈I,|an+1(x)+....+an+p(x)|<ε2,3,|an+1(x)bn+1(x)+….+an+p(x)bn+p(x)|≤(|bn+1(x)+2|bn+p(x)|)ε≤3Mε。8.()1,∑an(x)An(x)=nk=1∑ak(x)(n=1,2….)I;2,x∈I,{bn(x)};3,Ibn(x)0(n→∞);∞n=1∑an(x)bn(x)I。:1,M,x∈I,|an(x)|≤M,n,p,|an+1(x)+....+an+p(x)|=|An+p(x)-An(x)|≤2Mx∈I,2,|an+1(x)bn+1(x)+….+an+p(x)bn+p(x)|≤2M(|bn+1(x)+2|bn+p(x)|)3,ε>0,N,nN,x∈I,|bn(x)|ε|an+1(x)bn+1(x)+….+an+p(x)bn+p(x)|≤2M(ε+2ε)=6Mε,∞n=1∑an(x)bn(x)I。、∑(-1)nn+cosx,x∈-π2,π2221()an(x)=(-1)n,bn(x)=1n+cosx,∑an(x)-π2,π222,坌x∈-π2,π222,{bn(x)},limn->∞supx∈-π2,π222|bn(x)-0|=limn->∞1n=0-π2,π222,{bn(x)}0,-π2,π222。2()an(x)=(-1)nn,bn(x)=11+cosxn∑an(x),-π2,π222。x∈-π2,π222,{bn(x)},{bn(x)}-π2,π2221-π2,π222。9.Dini:(1)an(x)[a,b](2)∑an(x)[a,b]S(x)∑an(x)[a,b]S(x).、:∞n=1∑(-1)nnn2+x2(-∞,+∞)。:(Dini),|nk=1∑(-1)k≤1(-∞,+∞)。[a,b]奂R坌x∈[a,b],nnn2+x2奂奂limn->∞nn2+x2=0≡f(x)nn2+x2f(x)≡0[a,b],Dininn2+x2奂奂[a,b]0(580)123(1,2.655011;3.454010)【】,,,、。【】;;○○53120099SCIENCE&TECHNOLOGYINFORMATION(531),[a,b]。,[a,b](-∞,+∞)。【】[1],,,(),:,1985.[2],(),,,:,1987.[3],,:,1991.:,2005,2008,。《JournalofComputationalMathematics》。[:]●●(584),,。“”。“”,。4.4:①。②。③。。④、。,,1020,。。,,。。,“”,,。。,。,,,。,1500,、,,。,。,,。,“”、。,,。,,,;、,。,,———(CJKUnifiedIdeographs),、、,,、(,、、)ISO/IEC10646,,。,,,“”,;,,,“”“”,。。:(1974.10—),,,,。[:]●。,,,。3-5,。,。、、,,、、。。,、,。,,。,、,。,,,,。4.3,。21,,。,。2004,《》,。,,,。,,。4.4,“。,“”。,,,。“”,1/3,1/3[5]。,、、、,,。,,、、。5.,,,,,,,,,,。【】[1].———[J].,17,2002(4):78-79.[2],.[M].,,1999.[3]ChrisCooper,JohnFletcher;,.:[M].:,2004.42-43.[4].2008[DB/OL][5][J].,2004(4):54-56.:,,,。[:]●●○○580

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