共查询到19条相似文献,搜索用时 46 毫秒
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梁洪亮 《数学的实践与认识》2005,35(8):216-219
函数的微分运算化积分运算容易,把积分运算化为微分运算这是一大难题.利用微分算子方法可以把某些积分运算化为微分运算,且使形如∫f(x)eαxsinβxdx,∫f(x)eαxcosβxdx的积分运算简便、快捷. 相似文献
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A-调和方程弱解的双权Caccioppoli型不等式 总被引:3,自引:1,他引:2
研究形如div A(x,u(x))=0的A-调和方程,证明了其弱解满足局部Aλr双权Caccioppoli型不等式.其中算子A:Ω×Rn→Rn满足如下条件:对于正常数0相似文献
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本文研究了与微分形式中一类非齐次的Dirac-调和方程解相关的不等式问题.利用非齐次的Dirac-调和方程的条件和Dirac-调和算子D的运算法则,获得了Poincare不等式,Caccioppoli不等式和弱逆H?lder不等式.作为相关不等式的应用,证明了Poincare不等式赋特殊权和在Ls(μ)平均域上的形式.本文的研究将齐次Dirac-调和方程解的相关不等式推广到了对应该方程非齐次的情形. 相似文献
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指出了微分算子方法的缺陷,结果表明:它不能真正解决不定积分的快捷计算问题,有时甚至不如经典算法方便. 相似文献
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利用微分算子级数法 ,将若干类广义积分及变上限函数的积分问题化为微分运算 ,介绍它们转换的条件、公式及实例 . 相似文献
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选择Laplace-Beltrami算子△和Green算子G的复合算子△◇G为研究对象,首先证明了有界域的局部圆域上作用于齐次A-调和方程解的复合算子△◇G的带Radon测度的积分不等式,然后在此基础上得到有界域上全局的Radon积分不等式. 相似文献
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Let Pn be the class of polynomials of degree at most nRather and Shah [15]proved that if P∈Pnand P(z)≠0 in|z| 1, then for every R 0 and 0≤q ∞,|B[ P( Rz)]|q ≤|RnB[zn] + λ0 |q|1 + zn|q|P(z)|q,where B is a Bn-operator.In this paper, we prove some generalization of this result which in particular yields some known polynomial inequalities as specialWe also consider an operator Dαwhich maps a polynomial P(z) into DαP(z) := n P(z) +(α-z) P′(z) and obtain extensions and generalizations of a number of well-known Lq inequalities 相似文献
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In this article, we refine certain earlier existing bounds for Berezin number of operator matrices. We also prove some new Berezin number inequalities for general n × n operator matrices.Further, we establish several upper bounds for Berezin number and generalized Euclidean Berezin number for off-diagonal operator matrices. Finally, some interesting examples are discussed. 相似文献
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Operator h-preinvex functions are introduced and a refinement of HermiteHadamard type inequalities for such functions is established. Results proved in this paper are more general and some known results are special cases. 相似文献
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Mojtaba Bakherad 《Czechoslovak Mathematical Journal》2018,68(4):997-1009
The Berezin symbol à of an operator A acting on the reproducing kernel Hilbert space H = H(Ω) over some (nonempty) set is defined by \(\tilde A(\lambda ) = \left\langle {A\hat k_\lambda ,\hat k_\lambda } \right\rangle \), λ ∈ Ω, where \(\hat k_\lambda = k_\lambda /\left\| {k_\lambda } \right\|\) is the normalized reproducing kernel of H. The Berezin number of the operator A is defined by \(ber(A) = \mathop {\sup }\limits_{\lambda \in \Omega } \left| {\tilde A(\lambda )} \right| = \mathop {\sup }\limits_{\lambda \in \Omega } \left| {\left\langle {A\hat k_\lambda ,\hat k_\lambda } \right\rangle } \right|\). Moreover, ber(A) ? w(A) (numerical radius). We present some Berezin number inequalities. Among other inequalities, it is shown that if \(T = \left[ {\begin{array}{*{20}c} A & B \\ C & D \\ \end{array} } \right] \in \mathbb{B}(\mathcal{H}(\Omega _1 ) \oplus \mathcal{H}(\Omega _2 ))\), then
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$$ber(T) \leqslant \frac{1}{2}(ber(A) + ber(D)) + \frac{1}{2}\sqrt {(ber(A) - ber(D))^2 + \left( {\left\| B \right\| + \left\| C \right\|} \right)^2 } .$$
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定义受限Salagean算于的一般化族M(φ,n,b),这里φ(z)为正买部函数.完整的给出了当:i)b∈C,μ∈C;ii)b>0,μ∈R;(3)b∈C,μ∈R3种不同情况下关于Fekete-Szego函数A(f)=|a_3-μa_22}的最好界,这里.f∈M(φ,n,b).主要结果覆盖了一些相关的重要子族. 相似文献
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In this paper.a characterizationis,obtained for those pairs of weight funetions on(0=∞) for which the Hardy operator Pf(x)=f(t)dt is bounded from (μ) to ,0
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Let w(x), u(x) and (x) be weight functions. In this paper, underappropriate conditions on Young's functions 1, 2 we characterizethe inequality
for the Hardy-typeoperator T defined in [1] and the inequality
for the fractional maximal operator M, ; definedin [8], as well as the corresponding weak-type inequalities. 相似文献
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该文给出了单位圆上解析函数中φ(z),|φ(z)<1,对于 Hilbert空间 H上任一真压缩算子 A,算子φ(A)的范数估计,得出 sup b~2(φ)=2, sup b~2(φ)=1. b(φ)=sup(||φ(A)||(1-||A||~2) ||φ(A)||~2)~(1/2),b(φ)=sup{||φ(A)||(1-||A||~2) inf ||φ(A)x||~2}~(1/2),这里A取遍H上一切真压缩算子,并且若φ(z)=sum from σ=0 to n(0/σ),|φ(z)|,|φ(z)|<1,则||φ(A)|| ||φ(A)||≤2n,其中φ(z)=z~nφ(z~(-1)),且2是与n,φ(z)及A无关常数中的最小者. 相似文献