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Emin Özçag 《Proceedings Mathematical Sciences》1998,108(1):41-49
The existence of the neutrix convolution product of distributionx ? r Inx ? andx + ?3 is proved and some convolution products are evaluated. 相似文献
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François Apéry 《Comptes Rendus Mathematique》2010,348(9-10):479-482
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A contraction of the sphere , considered as the homogeneous space , to the Heisenberg group is defined. The infinite dimensional irreducible unitary representations of Heisenberg group are then shown to be the limits of the irreducible representations of which are class-1 with respect to . Our results generalise the earlier results of Fulvio Ricci.
(Received 1 July 1998; in revised form 3 November 1998) 相似文献
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We study Gorenstein right derived functors of ? ? ?with respect to semidualizing modules. As applications, some new criteria for a semidualizing module to be dualizing are given provided that R is a ring with a dualizing complex. 相似文献
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In this paper we prove that the equation (2
n
– 1)(6
n
– 1) = x
2 has no solutions in positive integers n and x. Furthermore, the equation (a
n
– 1) (a
kn
– 1) = x
2 in positive integers a > 1, n, k > 1 (kn > 2) and x is also considered. We show that this equation has the only solutions (a,n,k,x) = (2,3,2,21), (3,1,5,22) and (7,1,4,120). 相似文献
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In this work we introduce the concept of n
–1-isomorphism between Steiner systems (this coincides with the concept of isomorphism whenever n=1).Precisely two Steiner systems S1
and S2
are said to be n–1-isomorphic if there exist n partial systems S
i
(1)
,...,S
i
(n)
contained in Si, i.{1,2},such that S
1
(k)
and S
2
(k)
are isomorphic for each k{1,..., n}.The n–1-isomorphisms are also used to study nets replacements, see Ostrom [8], and to study the transformation methods of designs and other incidence structures introduced in [9] and generalized in [1] and [10].Work done under the auspicies of G.N.S.A.G.A. supported by 40% grants of M.U.R.S.T. 相似文献
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The conditions for the existence of a unique solution of the matrix equation AXB−CXD=E are proved to be that (i) the pencils A - λC and D - λB are regular, and (ii) the spectra of the pencils have an empty intersection. A numerical algorithm for solving the equation is proposed. The possibility of a least-squares-type solution is briefly discussed. The set of equations (YA−DZ,YC−BZ)=(E,F) is proved to be equivalent to the aforementioned equation, and its solution is also investigated. A numerical algorithm is proposed. 相似文献
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In this study, we determine when the Diophantine equation x 2?kxy+y 2?2 n = 0 has an infinite number of positive integer solutions x and y for 0 ? n ? 10. Moreover, we give all positive integer solutions of the same equation for 0 ? n ? 10 in terms of generalized Fibonacci sequence. Lastly, we formulate a conjecture related to the Diophantine equation x 2 ? kxy + y 2 ? 2 n = 0. 相似文献
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We discuss the representability almost everywhere (a.e.) in C of an irreducible algebraic function as the Cauchy transform of a signed measure supported on a finite number of compact semi-analytic curves and a finite number of isolated points. This brings us to the study of trajectories of the particular family of quadratic differentials A(z ? a)(z ? b)×(z ? c)?2 dz2. More precisely, we give a necessary and sufficient condition on the complex numbers a and b for these quadratic differentials to have finite critical trajectories. We also discuss all possible configurations of critical graphs. 相似文献
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