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Let p={pv} be a fixed sequence of complex numbers. Define \(p_n : = \mathop \Sigma \limits_{\nu = o}^n p_\nu \) and suppose that \(p_{m_k } \ne o\) for a subsequence M={mk} of nonnegative integers. The matrix A=(αkv) with the elements $$\alpha _{k\nu } = p_\nu /p_{m_k } if o \leqslant \nu \leqslant m_k ,\alpha _{k\nu } = oif \nu > m_k $$ generates a summability method (R,p,M) which is a refinement of the well known Riesz methods. The (R,p,M) methods have been introduced in [4]. In the present paper we are concerned with the summability of the geometric series \(\mathop \Sigma \limits_{\nu = o}^n z^\nu \) by (R,p,M) methods. We prove the following theorem. Suppose G is a simply connected domain with \(\{ z:|z|< 1\} \subset G,1 \varepsilon | G \) . Then there exists a universal, regular (R,p,M) method having the following properties: (1) \(\mathop \Sigma \limits_{\nu = o}^\infty z^\nu \) is compactly summable (R,p,M) to \(\tfrac{1}{{1 - z}}\) on G. (2) For every compact set B?¯Gc which has a connected complement and for every function f which is continuous on B and analytic in its interior there exists a subsequence M(B,f) of M such that \(\mathop \Sigma \limits_{\nu = o}^\infty z^\nu \) is uniformly summable (R,p,M(B,f)) to f(z) on B. (3) For every open set U?Gc which has simply connected components in ? and for every function f which is analytic on U there exists a subsequence M(U,f) of M such that \(\mathop \Sigma \limits_{\nu = o}^\infty z^\nu \) is compactly summable (R,p,M(U,f)) to f(z) on U.  相似文献   

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Ohne ZusammenfassungDiese Arbeit entstand in Kooperation der Geometer der TU Budapest und der Universität Potsdam.Unterstützt von der Ungarischen Wissenschaftlichen Forschungsstiftung (OTKA) No. T. 7351 (1993).  相似文献   

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Ohne ZusammenfassungHerrnFriedrich Karl Schmidt zum 60. Geburtstag am 22.9.1961 gewidmet  相似文献   

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Let (V,K,Q) be a finite dimensional metric vector space, and let C(Q) be the corresponding Clifford algebra. In this paper, representations of the classical groups On(V,Q) and POn(V,Q) by C(Q) are given for the case of arbitrary rank and arbitrary characteristic. For example, the following is proved: If R is the domain of regularity of C(Q) with center ZR then — apart from three exceptions — R/ZR is isomorphic to On(V,Q), and ancorresponding result is obtained for POn (V,Q).  相似文献   

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Ohne ZusammenfassungMit 11 lithograph. Tafelm.  相似文献   

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Ohne ZusammenfassungMit 8 lithograph. Tafeln.  相似文献   

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