共查询到20条相似文献,搜索用时 78 毫秒
1.
, Dv(.) , . 相似文献
2.
Б. В. КОНОПЛВ 《Analysis Mathematica》1981,7(4):239-256
The paper is devoted to the study of completeness problem of systems {
n
(x)}
n=0
inL
p
(a, b), where –a<b+,(x) is a weight function subject to mild assumptions, and(x) is a continuous function on (a,b), either bounded or unbounded in the neighbourhood of the end-points of (a,b). It turns out that this problem is connected with that of quasianalyticity of certain additive set of functions at a given point. As the most important application of the general results, the completeness problem is treated for systems of orthogonal polynomials. 相似文献
3.
Péter Komjáth 《Analysis Mathematica》1984,10(4):283-293
. , A
0,A
1,— - lim supA
j
- H,
. , - - . , , ; , , . - . - . 相似文献
4.
E. S. Belinskii 《Analysis Mathematica》1984,10(4):275-282
. f- ,S
n
(f)— . {n
k
}, n
k+1/n
k
>1+ck
–
,— , 0<1/2, f
0,
. 相似文献
5.
Christina Bauer 《Geometriae Dedicata》1998,72(3):309-324
This paper is concerned with an investigation to what extent a convex body is determined by projection functions. We introduce the notion of convex bodies that are almost determined by their brightness function and give a geometric characterization of these bodies. We further prove that, for i 2,...,d–2, a polytope is determined by its ith projection function, if all of its (i+1)-faces are parallelepipeds. Both results extend work by Gardner and Voli [4]. 相似文献
6.
R. Ž. Nurpeisov 《Analysis Mathematica》1989,15(2):127-143
H
(G), f(g)H
(G) , (, 1)- OHMC G. , OHMC, A. H. . , . , OHMC, lim supp
n=, , ,n .. . , 117 234 . . - 相似文献
7.
Lu(t)+(u,F)g(t)=f(t), tS. , ( F, g). .
The authors wish to thank Professor Yu. A. Rozanov for his help and discussions. 相似文献
The authors wish to thank Professor Yu. A. Rozanov for his help and discussions. 相似文献
8.
Summary In this paper we investigate the set of eigenvalues of a perturbed matrix {ie509-1} whereA is given and n × n, ||< is arbitrary. We determine a lower bound for thisspectral value set which is exact for normal matricesA with well separated eigenvalues. We also investigate the behaviour of the spectral value set under similarity transformations. The results are then applied tostability radii which measure the distance of a matrixA from the set of matrices having at least one eigenvalue in a given closed instability domain b. 相似文献
9.
Summary An alternating link
is canonically associated with every finite, connected, planar graph . The natural ideal polyhedral decomposition of the complement of
is investigated. Natural singular geometric structures exist onS
3–
, with respect to which the geometry of the cusp has a shape reflecting the combinatorics of the underlying link projection. For the class of balanced graphs, this induces a flat structure on peripheral tori modelled on the tessellation of the plane by equilateral triangles. Examples of links containing immersed, closed 1-injective surfaces in their complements are given. These surfaces persist after most surgeries on the link, the resulting closed 3-manifolds consequently being determined by their fundamental groups.Oblatum 20-V-1991 相似文献
10.
Let (x) denote the number of those integers n with (n) x, where denotes the Euler function. Improving on a well-known estimate of Bateman (1972), we show that (x)-Ax R(x), where A=(2)(3)/(6) and R(x) is essentially of the size of the best available estimate for the remainder term in the prime number theorem. 相似文献
11.
P. M. Robinson 《Probability Theory and Related Fields》1994,99(3):443-473
Summary For a realization of lengthn from a covariance stationary discrete time process with spectral density which behaves like 1–2H
as 0+ for 1/2<H<1 (apart from a slowly varying factor which may be of unknown form), we consider a discrete average of the periodogram across the frequencies 2j/n,j=1,..., m, wherem andm/n0 asn. We study the rate of convergence of an analogue of the mean squared error of smooth spectral density estimates, and deduce an optimal choice ofm. 相似文献
12.
A. I. Il'inskii 《Mathematical Notes》1977,21(5):400-405
In the framework of the theory of D. Kendall's delphic semigroups are considered problems of divisibility in the semigroup of convex characteristic functions on the semiaxis (0,). Letn ()={:1¦11 or 1=}, and Io()={: 1¦ 1 N()}. The following results are proved: 1) The semigroup is almost delphic in the sense of R. Davidson. 2) N() is a set of the type G which is dense in (in the topology of uniform convergence on compacta). 3) The class Io() contains only the function identically equal to one.Translated from Matematicheskie Zametki, Vol. 21, No. 5, pp. 717–725, May, 1977.The author thanks I. V. Ostrovskii for the formulation of the problem and valuable remarks. 相似文献
13.
N. Riahi 《Zeitschrift für Angewandte Mathematik und Physik (ZAMP)》1980,31(2):261-266
Summary For the Prandtl numberP in the rangeP 1/3 1 ( is the ratio between the thermal conductivities of the boundary and of the fluid) two-dimensional rolls are preferred in contrast to square-pattern convection that represents the preferred stable convection in the rangeP 1/3.
Zussammenfasung Für PrandtlzahlenP, die der RelationP 1/3 1 genügen (\ ist das Verhältnis zwischen den thermischen Leitfähigkeiten der Wand und des Fluid), sind zweidimensionale Rollen bevorzugt im Gegensatz zur quadratartigen Konvektion, welche die bevorzugte stabile Konvektionsform im BereichP 1/3 darstellt.相似文献
14.
Let k be a commutative ring, GG finite affine algebraic k-groups, and HH the dual Hopfalgebras of the affine algebras of G resp. G. The main results of this paper are: (I) If k is semilocal (e.g. k a field) there is an H-linear, HH-colinear, unitary, augmented isomorphism HHH H, where HH is the coalgebra belonging to G/G. (II) If the k-submodule of the fixelements of (HH)* is isomorphic to k (e.g. k principal or semilocal), then HH is a Frobeniusextension of the second kind. 相似文献
15.
I. Szalay 《Analysis Mathematica》1990,16(1):65-80
[4] , [C,(, )];- (, 0 1) s, [C,(+,+)]- s , 0 0< , (i) , ; > > 1
, (ii) ,>0; >=1 ,>1-1/, [C,(,)- [C,(+,+)]- .
This work was done while the author was a visiting researcher at the Steklov Mathematical Institute, Moscow, U.S.S.R. 相似文献
This work was done while the author was a visiting researcher at the Steklov Mathematical Institute, Moscow, U.S.S.R. 相似文献
16.
Fausto Segala 《Annali di Matematica Pura ed Applicata》1985,140(1):285-299
Sunto Si costruisce una parametrice per il problema di Dirichlet relativo ad operatori P del tipo (1/i(/t))2 + tx, nella regione t0. Tenuto conto che per tali operatori è nota la parametrice del problema di Cauchy nella regione t 0, ciò consente di costruire una soluzione (modO
) dell'equazione Pu=f , t (–T, T), T>0. 相似文献
17.
Ben Salem Nejib 《Journal of Theoretical Probability》1994,7(2):417-436
We consider hypergroups associated with Jacobi functions
()
(x), (–1/2). We prove the existence of a dual convolution structure on [0,+[i(]0,s
0]{{) =++1,s
0=min(,–+1). Next we establish a Lévy-Khintchine type formula which permits to characterize the semigroup and the infinitely divisible probabilities associated with this dual convolution, finally we prove a central limit theorem. 相似文献
18.
Let
, the parameter space, be an open subset ofR
k
,k1. For each
, let the r.v.'sX
n
,n=1, 2,... be defined on the probability space (X, P
) and take values in (S,S,L) whereS is a Borel subset of a Euclidean space andL is the -field of Borel subsets ofS. ForhR
k
and a sequence of p.d. normalizing matrices
n
=
n
k × k
(0 set
n
*
= * = 0 +
n
h, where 0 is the true value of , such that *,
. Let
n
(*, *)( be the log-likelihood ratio of the probability measure
with respect to the probability measure
, whereP
n
is the restriction ofP
over
n
= (X
1,X
2,...,X
n
. In this paper we, under a very general dependence setup obtain a rate of convergence of the normalized log-likelihood ratio statistic to Standard Normal Variable. Two examples are taken into account. 相似文献
19.
Roeland P. van der Marel 《BIT Numerical Mathematics》1990,30(3):516-528
This paper deals with polynomial approximations(x) to the exponential function exp(x) related to numerical procedures for solving initial value problems. Motivated by stability requirements, we present a numerical study of the largest diskD()={z C: |z+|} that is contained in the stability regionS()={z C: |(z)|1}. The radius of this largest disk is denoted byr(), the stability radius. On the basis of our numerical study, several conjectures are made concerningr
m,p=sup {r():
m,p}. Here
m, p (1pm; p, m integers) is the class of all polynomials(x) with real coefficients and degree m for which(x)=exp(x)+O(x
p+1) (forx 0). 相似文献
20.
Klaus-Jürgen Eckardt 《manuscripta mathematica》1976,18(1):43-55
The problem of existence of wave operators for the Klein-Gordon equation (
t
2
–+2+iV1t+V2)u(x,t)=0 (x R
n,t R, n3, >0) is studied where V1 and V2 are symmetric operators in L2(R
n) and it is shown that conditions similar to those of Veseli-Weidmann (Journal Functional Analysis 17, 61–77 (1974)) for a different class of operators are also sufficient for the Klein-Gordon equation. 相似文献