简介:ThispapersummarizedrecentachievementsobtainedbytheauthorsabouttheboxdimensionsoftheBesicovitchfunctionsgivenbyB(t):=∞∑k=1λs-2ksin(λkt),where1<s<2,λk>0tendstoinfinityask→∞andλksatisfiesλk+1/λk≥λ>1.Theresultsshowthatlimk→∞logλk+1/logλk=1isanecessaryandsufficientconditionforGraph(B(t))tohavesameupperandlowerboxdimensions.ForthefractionalRiemann-LiouvilledifferentialoperatorDuandthefractionalintegraloperatorD-v,theresultsshowthatifλissufficientlylarge,thenanecessaryandsufficientconditionforboxdimensionofGraph(D-v(B)),0<v<s-1,tobes-vandboxdimensionofGraph(Du(B)),0<u<2-s,tobes+uisalsolimk→∞logλk+1/logλk=1.
简介:Inthispaper,thesharpdistortiontheoremsoftheFr′echet-derivativetypeforasubclassofbiholomorphicmappingswhichhaveaparametricrepresentationontheunitballofcomplexBanachspacesareestablished,andthecorrespondingresultsoftheabovegeneralizedmappingsontheunitpolydiskinC~narealsogiven.Meanwhile,thesharpdistortiontheoremsoftheJacobideterminanttypeforasubclassofbiholomorphicmappingswhichhaveaparametricrepresentationontheunitballwithanarbitrarynorminC~nareobtained,andthecorrespondingresultsoftheabovegeneralizedmappingsontheunitpolydiskinC~naregotaswell.Thus,someknownresultsinpriorliteraturesaregeneralized.
简介:Inthispaperthefollowingresultisobtained:Supposef(x.u,v)isnonnegative,con-tinuousin(a,b)×R^+×R^+;fmaybesingularatx=a(and/orx=b)andv=0;fisnonde-creasingonuforeachx,v,nonincreasingonv[oreachx.u;thereexistsaconstantq∈(0,1)suchthatt^qf(x,t^-1u,tu)≤f(x,u,u)≤λqf(x,λ^-1u,λu),V0