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1.
The Structure of NBe—rpp Semigroups   总被引:2,自引:0,他引:2  
郭小江 《东北数学》2000,16(4):398-404
§ 1.IntroductionandMainResults AsemigroupSiscalledanrppsemigroupifallprincipalrightidealsaS1(a∈S)ofS ,regardedasanS1 system ,areprojective (see,[1 ]and [2 ] ) .AsemigroupSisanrppsemigroupifandonlyifforalla∈S ,thesetMa ={e∈E S1a Seand ( x ,y∈S1)ax=ay ex=ey}isnonempty ,whereE …  相似文献   

2.
·IMO 1997washeldinMardelPlata ,Argentina .· 82termswererepresented .·Therewere 39goldmedals,70silvermedals,and 12 2bronzemedalsawarded .·TopscorerswereCarlBosley(USA) ,DoQuocAnh(Vietnam) ,EamanEftekhari(Iran) ,andCiprianManolescu(Romania) ,eachwithperfectscoresof 42 .Proble…  相似文献   

3.
邱瑞峰 《东北数学》2000,16(4):484-490
§ 1.Introduction LetMbeacompact 3 manifold .IfthereisaproperlyembeddedclosedsurfaceSinMwhichseparatesMintotwocompressionbodiesH1andH2 ,thenMcanbewrittenasM =H1∪SH2 .ThisstructureonMiscalledaHeegaardsplittingofMandSisasplittingsurface .H1∪SH2 issaidtobereducible…  相似文献   

4.
·IMO 1 999washeldinBucharest,Romania.· 81termswererepresented .·Therewere 3 8goldmedals,70silvermedals ,and 1 1 8bronzemedalsawarded .·RomaniabecamethefirstcountrytohostIMOfivetimes.·TopscorerswereTam偄sTerpai (Hungary) ,StefanLaurentiuHornet (Romania)andMaksymFedorchuk(…  相似文献   

5.
§ 1 IntroductionLetRn×mdenotetherealn×mmatrixspace ,Rn×mr itssubsetwhoseelementshaverankr ,ORn×nthesetofalln×northogonalmatrices,SRn×n(SRn×n≥ ,SRn×n>)thesetofalln×nrealsymmetric (symmetricpositivesemidefinite ,positivedefinite)matrices.ThenotationA>0 (≥ 0 ,<0 ,≤ 0 )m…  相似文献   

6.
§ 1 IntroductionInthispaper ,wewillconsiderthesemilinearSchr dingerequationinonespacedimensionofthetypeut-iuxx =F(u) .  (x ,t)∈R×R+,( 1 )u(x ,0 ) =u0 , x ∈R ,( 2 )whereu =u(x ,t)iscomplex valuedfunction ,andFisasmoothfunctionofusuchthat|F(u) | =O( |u|α+1)for |u|sufficientlysmalland…  相似文献   

7.
No .1 (March 3 0 ,2 0 0 1 )OntheConfidenceLimitsofBernoulliParameterinAnySequentialCase CHENJia_ding( 1 )………………StatisticalPropertiesandConfidenceLimitsabouttheMeanTimebetweentheFailures (MTBF)inFailure freePeriodLifeTest (FFPLT)WANGQing_cheng( 9)………………………………………………………O…  相似文献   

8.
Throughoutthispaper,Gisafinitegroup ,pisaprimeinπ(G) ,andM <·GdenotesthatMisamaximalsubgroupofG .A/BiscalledasectionofGifB A≤G .Therestofnotationsisstandardandtakenmainlyfrom [1 ]and [2 ] . In [3] ,Weilandtprovedthewell knowntheorem :Gissolvableifitcontainstwonilpote…  相似文献   

9.
●  IMOwasheldinHongKong .●   6 9termswererepresented .●  Therewere 30 goldmedals ,6 3silvermedals ,and 1 0 2bronzemedalsawarded .●  ForthefirsttimeeverinIMOhistory ,allthemembersofateamscoredaperfect 42 ,earningthemeachagoldmedal.ThisteamwasfromtheUSA .Theirachievementw…  相似文献   

10.
题 3 5  三角形ABC中 ,三内角为A ,B ,C ,复数z =52 sinA +B2 +icos A -B2 ,|z| =324 .1)求tanA·tanB的值 ;2 )当C取最大值时 ,存在动点M使 |MA| ,|AB| ,|MB|成等差数列 .试通过建立适当的坐标系 ,求|MC||AB| 的最大值 .解  1) |z| 2 =52 sin A +B22 +cos2 A -B2 =98,即 10sin2 A +B2 + 8cos2 A -B2 =9,10·1-cos(A +B)2 + 8·1+cos(A -B)2 =9,∴ 4cos(A -B) - 5cos(A +B) =0 ,4cosAcosB + 4sinAsinB -5cosAcosB + 5sinA…  相似文献   

11.
SubtractionasSlidingDownSupposethetemperatureis 5 0°anddrops 12°.Thissituationcanbepicturedonanum berline.Startat 5 0°andslide 12°totheleft.Theresultingtemperatureis 3 8°.Theanswercouldalsobefoundbysubtracting 5 0 -12 .Thissubtractionisnottake awayorcomparison,thisis…  相似文献   

12.
§ 1.Introduction ForagraphGwedenotebyV(G)andE(G) ,respectively ,thevertexsetandedgesetofG ,with |V(G) | =ν(G)and |E(G) | =ε(G) .Agraphwithmulti edgeallowableiscalledamulti graph .Aplanargraphissuchagraphwhichhasanembedding μ(G)ofthegraphintheplane .IfGisaplanargraph ,weden…  相似文献   

13.
ModifiedTricomiProblemforaNonlinearSystemofSecondOrderEquationsofMixedTypeSunHesheng(孙和生)(InstituteofAppliedPhysicsandComputa...  相似文献   

14.
THEFEYNMANKACFORMULAFORSYMMETRICMARKOVPROCESSESYINGJINAGANGAbstractLetXbeanmsymmetricMarkovprocesandMamultiplicativefunc...  相似文献   

15.
Examples     
Wehavelearnedhowtoconvertasubtractiontoanaddition .Nowlet’stakesomeexample.s .Example 1   Simplify  - 5- 2 .Solution 1Usetheslidemodel.Startat - 5andslidedown 2Theresultis - 7.So - 5- 2 =- 7.Solution 2 :UsetheAlgebraicDefinitionofSubtraction .- 5- 2 =- 5+- 2 =- 7(Insteadofsubtracting 2…  相似文献   

16.
SYMPLECTIC SCHEMES FOR NONAUTONOMOUS HAMILTONIAN SYSTEM   总被引:3,自引:0,他引:3  
SYMPLECTICSCHEMESFORNONAUTONOMOUS HAMILTONIAN SYSTEMQINMENGZHAO(秦孟兆)(InstitateofComputationalMathematicsandScientific-Enginee...  相似文献   

17.
1 IntroductionLetXbeacompactHausdorffspace ,withC(X)thespaceofcontinuousfunctionsdefinedonX ,andletM C(X)benonempty.LetF(x ,y) :X×R →Rbeanon negativefunction ,andconsiderthefollowingminimizationproblem :findy∈Mtominimize‖F(.,y )‖ ,(1)where‖F (.,y )‖ =supx∈XF(x ,y(x) ) .Them…  相似文献   

18.
WeightedNNDDiferenceSchemes1RuquanWANG&YiqingSHEN(InstituteofComputationalMathematicsandScientific/EngineeringComputing,Acad...  相似文献   

19.
§ 1.Introduction Intopologicalgraphtheory ,agraphmayhavemultipleadjacentiesandselfloops.Agraphiscalledsimplicialifithasnomultipleadjacenciesandselfloops .Asurfacehereisacompact2 manifoldwithoutboundary .Anembeddingofagraphiscellularifeachcomponentofthesur…  相似文献   

20.
On Construction of Optimal A2-Codes   总被引:2,自引:0,他引:2  
胡磊 《东北数学》2001,17(1):27-33
§ 1.Introduction Theauthenticationcodeswitharbitration (A2 codes)areintroducedbySimmons[1]andstudiedinmanypapers (forexample ,[1— 8] ) .Oneofthemostimportantproblemsinthestudyofauthenticationcodesistofindlowerboundsoncheatingprobabilitiesandonthenumbersofencodi…  相似文献   

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