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931.
We investigate the links between Sobolev and Nash inequalities, capacity and hitting times estimates and ultracontractive semigroups, in a non-symmetric setting. 相似文献
932.
We estimate the concentration functions of n-fold convolutions of one-dimensional probability measures. The Kolmogorov–Rogozin inequality implies that for nondegenerate distributions these functions decrease at least as O(n
–1/2). On the other hand, Esseen(3) has shown that this rate is o(n
–1/2) iff the distribution has an infinite second moment. This statement was sharpened by Morozova.(9) Theorem 1 of this paper provides an improvement of Morozova's result. Moreover, we present more general estimates which imply the rates o(n
–1/2). 相似文献
933.
934.
In this paper cubature formulas based on bivariate C
1 local polynomial splines with a four directional mesh [4] are generated and studied. Some numerical results with comparison
with other methods are given. Moreover the method proposed is applied to the numerical evaluation of 2‐D singular integrals
defined in the Hadamard finite part sense. Computational features, convergence properties and error bounds are proved.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
935.
936.
L. P. Rapoport 《JETP Letters》1998,68(3):198-203
A new representation is found for the interaction of intense circularly polarized light with an atom. A stationary centrosymmetric
part, which depends on the field parameter a
0=F/ω2, is separated out from the atom-field interaction. The time-dependent part of the interaction is represented in the form
of a multipole expansion with a
0 taken into account. The application of this representation for calculating the nonlinear dynamic polarizability of a complicated
atom in the random-phase approximation with exchange is studied.
Pis’ma Zh. éksp. Teor. Fiz. 68, No. 3, 189–193 (10 August 1998) 相似文献
937.
E. P. Golubeva 《Journal of Mathematical Sciences》1998,89(1):955-957
It is proved that for an arbitrary positive integer k the equation n=x2+y2+z3+u3+v4+w14+t4k+1 has a positive integer solution for all sufficiently large n. Bibliography: 6 titles.
Translated fromZapiski Nauchnykh Seminarov POMI, Vol. 226, 1996, pp. 65–68. 相似文献
938.
We prove contour-solid theorems for holomorphic functions defined in finely open sets of the complex plane.
Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 50, No. 5, pp. 712–723, May, 1998. 相似文献
939.
940.
Limit theorems for the number of records in a sequence of independent nonidentically distributed random variables are obtained.
A generalization of the so-called Fα-scheme is given. Bibliography: 4 titles.
Translated fromZapiski Nauchnykh Seminarov POMI, Vol. 216, 1994, pp. 42–51.
Translated by A. Sudakov. 相似文献