共查询到20条相似文献,搜索用时 31 毫秒
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Siberian Mathematical Journal - We study the $ p $ -reducibility of numberings which was introduced and first studied by Degtev. $ p $ -Reducibility is an effectively bounded version of the $ e $... 相似文献
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Siberian Mathematical Journal - Let $ {\mathcal{A}} $ be a unital $ \ast $ -algebra containing a nontrivial projection. Under some mild conditions on $ {\mathcal{A}} $ ,... 相似文献
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Siberian Mathematical Journal - The notion of $ P $ -stability is a particular case of the generalized stability of complete theories. This paper discusses some problems that are related to the $ P... 相似文献
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Siberian Mathematical Journal - Studying the properties of almost $ \omega $ -categorical weakly $ o $ -minimal theories of convexity rank 1, we prove the orthogonality of every family of... 相似文献
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A finite group whose irreducible complex characters are rational is called a
-group. In this paper we will find the structure of Frobenius
-groups.Received: 14 April 2003 相似文献
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Siberian Mathematical Journal - Continuing the study of weak $ o $ -minimality, we prove a theorem on the behavior of a definable unary function on the set of realizations of a nonalgebraic 1-type... 相似文献
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Siberian Mathematical Journal - We prove that $ G $ is a finite $ \sigma $ -soluble group with transitive $ \sigma $ -permutability if and only if the following hold: (i) $ G $ possesses... 相似文献
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Siberian Mathematical Journal - As a common generalization of Rickart $ \ast $ -rings and generalized Baer $ \ast $ -rings, we say that a ring $ R $ with an involution ... 相似文献
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The Yamabe invariant of a smooth compact manifold is by definition the supremum of the scalar curvatures of unit-volume Yamabe metrics on the
manifold. For an explicit infinite class of 4-manifolds, we show that this invariant is positive but strictly less than that
of the 4-sphere. This is done by using Dirac operators to control the lowest eigenvalue of a perturbation of the Yamabe Laplacian. These results dovetail perfectly
with those derived from the perturbed Seiberg–Witten equations [Le3], but the present method is much more elementary in spirit.
Submitted: October 1997 相似文献
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Siberian Mathematical Journal - We study some conditions for a group to be $ \sigma $ -solvable or meta- $ \sigma $ -nilpotent. 相似文献
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Siberian Mathematical Journal - We give an example of a series of finite $ D_{\pi} $ -groups where for each group $ G $ in the series and its $ \pi $ -Hall subgroup $ H $ , the inequality $ H\cap... 相似文献
15.
We locally classify the 3-dimensional generalized ($\kappa,\mu$)-contact
metric manifolds, which satisfy the condition $\Vert grad\kappa \Vert =$const.
($\not=0$). This class of manifolds is determined by two arbitrary functions of one
variable. 相似文献
16.
Summary. We study here in detail the location of the real and complex zeros of the partial sums of and , which extends results of Szeg? (1924) and Kappert (1996).
Received November 9, 2000 / Published online August 17, 2001 相似文献
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In this note we define the property (ω′), a variant of Weyl’s theorem, and establish for a bounded linear operator defined on a Hilbert space the necessary and sufficient conditions for which property (ω′) holds by means of the variant of the essential approximate point spectrum σ1(·) and the spectrum defined in view of the property of consistency in Fredholm and index. In addition, the perturbation of property (ω′) is discussed. 相似文献
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In the note,we establish for a bounded linear operator defined on a Hilbert space the necessary and sufficient conditions for the stability of property(ω) by means of the variant of the essential approximate point spectrum and the induced spectrum of consistency in Fredholm and index.In addition,the stability of property(ω) for H(P) operators is considered. 相似文献
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In this note we study the property (ω), a variant of Weyl's theorem introduced by Rakocevic, by means of the new spectrum. We establish for a bounded linear operator defined on a Banach space a necessary and sufficient condition for which both property (ω) and approximate Weyl's theorem hold. As a consequence of the main result, we study the property (ω) and approximate Weyl's theorem for a class of operators which we call the λ-weak-H(p) operators. 相似文献