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排序方式: 共有2698条查询结果,搜索用时 15 毫秒
101.
André Adler 《Journal of Theoretical Probability》2002,15(4):939-949
Consider independent and identically distributed random variables {X,X
nj
, 1jn,n1} with density f(x)=px
–p–1
I(x1), where p>0. We show that there exist unusual generalized Laws of the Iterated Logarithm involving the larger order statistics from our array. 相似文献
102.
A classical result in the theory of uniform spaces is that any topological space with a base of clopen sets admits a uniformity with a transitive base and the uniform topology of such a space has a base of clopen sets. This paper presents a pointfree generalization of this, both to uniform and quasi-uniform frames, together with various properties concerning total boundedness, compactifications and completions. 相似文献
103.
The universal enveloping C
*-algebra A
of twisted canonical commutation relations is considered. It is shown that, for any (–1,1), the C
*-algebra A
is isomorphic to the C
*-algebra A
0 generated by partial isometries t
i
,t
i
*,i=1,¨,d satisfying the relations
t
i
*
t
j
=
ij
(1–
k<i
t
k
t
k
*), t
j
t
i
=0, ij
and it is proved that the Fock representation of A
is faithful. 相似文献
104.
Shunpu Zhang Rohana J. Karunamuni 《Annals of the Institute of Statistical Mathematics》2000,52(4):612-629
In this paper we consider the deconvolution problem in nonparametric density estimation. That is, one wishes to estimate the unknown density of a random variable X, say f
X
, based on the observed variables Y's, where Y = X + with being the error. Previous results on this problem have considered the estimation of f
X
at interior points. Here we study the deconvolution problem for boundary points. A kernel-type estimator is proposed, and its mean squared error properties, including the rates of convergence, are investigated for supersmooth and ordinary smooth error distributions. Results of a simulation study are also presented. 相似文献
105.
106.
V. T. Khudalov 《Mathematical Notes》2000,68(5-6):640-643
It is proved that the tensor product of two linear operators is a cone summing operator (respectively, order bounded operator) if and only if both operators are cone summing (respectively, order bounded). 相似文献
107.
Srdjan Petrovic 《Proceedings of the American Mathematical Society》1996,124(9):2807-2811
In this paper we study the Foias-Williams operator
where , and is a Hankel operator with symbol . We exhibit a relationship between the similarity of to a contraction and the rate of decay of , the absolute values of the Fourier coefficients of the symbol .
108.
109.
110.
Jeannette H. C. Woerner 《商业与工业应用随机模型》2005,21(1):27-44
In the framework of stochastic volatility models we examine estimators for the integrated volatility based on the pth power variation (i.e. the sum of pth absolute powers of the log‐returns). We derive consistency and distributional results for the estimators given high‐frequency data, especially taking into account what kind of process we may add to our model without affecting the estimate of the integrated volatility. This may on the one hand be interpreted as a possible flexibility in modelling, for example adding jumps or even leaving the framework of semimartingales by adding a fractional Brownian motion, or on the other hand as robustness against model misspecification. We will discuss possible choices of p under different model assumptions and irregularly spaced data. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献