简介:TheauthorsproveaquantitativestabilityresultfortheBrunn-Minkowskzinequalityonsetsofequalvolume:If|A|=|B|〉0and|A+B|^1/n=(2+δ)|A|^1/nforsomesmallδthen,uptoatranslation,bothAandBareclose(intermsof5)toaconvexsetK.Althoughthisresultwasalreadyprovedbytheauthorsinapreviouspaper,thepresentpaperprovidesamoreelementaryproofthattheauthorsbelievehasitsowninterest.Also,theresulthereprovidesastrongerestimateforthestabilityexponentthanthepreviousresultoftheauthors.
简介:Apredator-preysystemwithaconstantproportionofpreyrefugeandstage-structureforpreyspeciesisproposedandstudiedinthispaper.Asetofconditionsforthepermanenceofthesystemisobtained.Thelocalstabilityofthesystemisdiscussedbythesignofeigenvalues.Furthermore,byusingtheiterativemethod,somesuitablesufficientconditionsfortheglobalattractivityoftheinteriorequilibriumisobtained.Ourstudyshowsthattheconstantproportionofpreyrefugecouldleadtomorecomplicatedynamicbehaviors.Numericalsimulationsarealsopresentedtoillustratethefeasibilityofthemainresults.