学科分类
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118 个结果
  • 简介:给出了H2(Tn)(n≥2)上Toeplitz算子的特征方程组:T*ziTTzi=T,并在此基础上证明了两个Topelitz算子相乘φ,ψ∈L∞(Tn),TφTψ仍为Toeplitz算子的充要条件:φ对z1,z2,…,zn中某些变量共轭解析,ψ对余下变量解析,且乘积为Tφψ.

  • 标签: TOEPLITZ算子 乘积 特征方程 共轭 充要条件 变量
  • 简介:给出了两种插值算子,并研究了它们在和L2πp和Lp(R)L空间上的逼近阶.用实数α阶的积分模给出逼近度.更多还原

  • 标签: 插值 逼近 三角多次式 整函数
  • 简介:We’llstudytheFEMforamodelforcompressiblemiscibledisplacementinporousmediawhichincludesmoleculardiffusionandmechanicaldispersioninone-dimensionalspace.Aclassofvertices-edges-elementsinterpolationoperatorinkisintroduced.Withthehelpofink(notellipticprojection),theoptimalerrorestimateinL∞(J;L2(Ω))normofFEMisproved.

  • 标签: Molecular diffusion and mechanical dispersion SINGLE-PHASE
  • 简介:浅谈公式x+(a+b)x+ab=(x+a)(x+b)遂宁安居镇中学何旭东十字相乘法是因式分解的一种方法,其灵活性大,难度高。现行义务教材用它分解二次项系数为1和二次项系数不为1的二次三项式,但未提及双十字相乘法。现在我们用公式:x+(a+b)x=...

  • 标签: 分解因式 二次项系数 二次式 因式分解 二次三项式 双十字相乘法
  • 简介:Anonlinearparabolicsystemisderivedtodescribeincompressiblenuclearwaste-disposalcontaminationinporousmedia.Asequentialimplicittirne-steppingisdefined,inwhichthepressureandDarcyvelocityofthemixtureareapproximatedsimultaneouslybyamixedfiniteelementmethodandthebrine,radionuclidandheataretreatedbyacombinationofaGalerkinfiniteelementmethodandthemethodofcharacteristics.Optimal-orderconvergenceinL2isproved.Time-truncationerrorsofstandardproceduresarereducedbytimesteppingalongthecharacteristicsofthehyperbolicpartofthebrine,radionuclideandhealequalios,temporalandspatialerrorarelossenedbydirectcompulationofthevelocityinthemixedmethod,asopposedtodifferentiationofthepressure.

  • 标签: NONLINEAR PARABOLIC system mixed finite element
  • 简介:<正>WestudythesolvabilityoftheCauchyproblem(1.1)-(1.2)forthelargestpossibleclassofinitialvalues,forwhich(1.1)-(1.2)hasalocalsolution.Moreover,wealsostudythecriticalcaserelatedtotheinitialvalueu0,for1

  • 标签: P-LAPLACIAN equation STRONGLY NON-LINEAR SOURCES Existence
  • 简介:TheaimofthispaperistogiveupperboundsofthenormoftheoperatorandassociatederrorforaLagrangeinterpolationproblembyC~1quadraticsplines.Thedomainisrectangularandthetype-2triangulationisnon--uniform.Moreoverthelocationofdatapointsallowsaverysimplecompationoftheinterpolant.

  • 标签: BOUNDS TRIANGULATION ERROR interpolation QUADRATIC INTEGERS
  • 简介:USINGFINITEGEOMETRIESTOCONSTRUCT3-PBIB()DESIGNSAND3-DESIGNS¥YANGBENFU(DepartmentofMathematics,ChengduTeachersCollege,Chengdu...

  • 标签: FINITE GEOMETRY design.
  • 简介:Anecessaryandsufficientconditionofregularityof(0,1,…,m-2,m)interpolationonthezerosof(1-x)Pn-1α,β(x)(α>-1,β≥-1)inamanageableformisestablished,wherePn-1α,β(x)standsforthe(n-1)thJacobipolynomial.Meanwhile,theexplicitrepresentationofthefundamentalpolynomialswhentheyexist,isgiven.

  • 标签: Birkhoff INTERPOLATION REGULARITY Explicit representation Jacobi
  • 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.

  • 标签: CHARACTER SUMS CONGRUENCES
  • 简介:SINGULARITYANDQUADRATUREREGULARITYOF(0,1,...,m-,m)─INTERPOLATIONONTHEZEROSOF(1-x)Pn-1αβ(x)ShiYingguang(史应光)(ComputingCe...

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