简介:让Λ=kQ/I是有限维的Nakayama代数学,在Q是一个欧几里德几何学的图Yun徐舸电子邮件的地方:xuy@hubu.edu.cn参考书[1]。马克·莱恩,S.:相同,Grundlehren数学。Wiss。114,Springer,柏林,1975[2]。Happel,D.:有限维的代数学的Hochschildcohomology。在数学的讲课笔记,1404,108126(1989)[3]。Skowroński,A.:简单地连接的代数学和Hochschildcohomology。Proc。ICRAIV(渥太华,1992),能。数学。Soc。Proc,14,431447(1993)[4]。Assem,I.,delaPeña,J.A.:三角形的代数学的foundamental组。Comm。代数学,24,187208(1996)[5]。Gerstenhaber,M.:在戒指和代数学的变丑上。安。数学,79,59103(1964)[6]。Igusa,K.:笔记在上没有环推测。J。纯Appl。代数学,69,161176(1990)[7]。刘,S.X.,张,P.:截断的代数学的Hochschild相同。公牛。伦敦数学。Soc,26,427430(1994)[8]。Avramov,L.L.,Vigueé-Poirrier,M.:为光滑的Hochschild相同标准。Internat。数学。研究通知,1,1725(1992)[9]。汉,Y.:Hochschild(co)相同尺寸。J.伦敦数学。Soc,73(2),657668(2006)[10]。凯勒,B.:为DG代数学的周期的相同的不变性和本地化。J。纯Appl。代数学,123,223273(1998)[11]。Erdmann,K.,河边肥沃的低地T.:为班的self-injective代数学的扭曲的双性人模块和Hochschildcohomology一。论坛数学,11,177201(1999)[12]。Bardzell,M.J.,Locateli,A.C.,Marcos,E.N.:在截断的周期代数学的Hochschildcohomology上。CommAlg,28(3),16151639(2000)[13]。Assem,I.,Simson,D.,Skowroński,A.:联合代数学的表示理论的元素,伦敦数学。Soc。学生文章65,剑桥大学出版社,剑桥,2005[14]。Snashall,N.,Solberg,Ø.:支持变化和Hochschildcohomology
简介:<正>LetRbeanassociativeringnotnecessarilypossessinganidentityand(S,≤)astrictlytotallyorderedmonoidwhichisalsoartinianandsatisfiesthat0≤sforanys∈S.AssumethatMisaleftR-modulehavingproperty(F).ItisshownthatMisaco-HopfianleftR-moduleifandonlyif[MS,≤]isaco-Hopfanleft[[RS,≤]]-module.
简介:Inrecentyears,accidentsandproductrecallscausedbyproductdefectshavebecomeimportantproblemsinnumerousindustriesworldwide.Nevertheless,mostexistingstudieshaveexaminedproductrecallsusingempiricalapproaches.Toimproveproductrecallsystems,westudiedsocialsimulationusingamulti-agentsystemwithaco-evolutionmodel.Thisresearchisimportantbecauseempiricalapproachesarenolongeradequateforcomplexanddiversemodernsocieties.Discussionsusingquantitativeandpredictiveapproaches,includingagent-basedsimulation,arethereforeexpected.Forthisstudy,weusedaLayeredCo-evolutionModeltoreflectsituationsoftherealsocietyusingproduceragentsandconsumeragents.Additionally,weappliedmulti-objectiveoptimizationtechniquestointroducepricecompetitionsituationsintoanartificialsociety.Weconductedasimulationexperiment,fromwhichwediscoveredthepossibilitiesthatcostreductionforhuge-scaleproductrecallsisefficient,andthatpunishmentofproducersthatconductnoproductrecallscanbenefitconsumers.Webelievethisworkcancontributetosupportingnotonlygovernmentstaffforimprovingproductrecallsystems,butalsoexecutiveofficersofproductcompaniesfordeliberatingtheirstrategiesofrecalldecisions.
简介:ForquadraticnumberfieldsF=Q(√2pl…pt-1)withprimespj≡1mod8,theauthorsstudytheclassnumberandthenormofthefundamentalunitofF.TheresultsgeneralizenicelywhathasbeenfamiliarforthefieldsQ(√2p)withaprimep≡1mod8,includingdensitystatements.Andtheresultsarestatedintermsofthequadraticformx2+32y2andillustratedintermsofgraphs.
简介:<正>Foranyintegersa1,a2,a3,a4andcwitha1a2a3a40(modp),thispapershowsthatthereexistsasolutionX=(x1,x2,x3,x4)∈Z4ofthecongruencea1x12+a2x22+a3x32+a4x42≡c(modp)suchthat‖X‖=max{|x1|,|x2|,|x3|,|x4|}《p1/2logp.
简介:Inthispaper,weshowthatnewmodifieddoublecosinetrigonometricsumsintroducedin[1]areinappropriate,theclassofdoublesequencesJdintroducedthereisunusableforsuchsumsandconsequentlytheresultsobtainedinitarecompletelyincorrect.WehereintroduceappropriatemodifieddoublecosinetrigonometricsumsmakingtheclassJdusableconsideringaparticulardoublecosinetrigonometricseries.