共查询到20条相似文献,搜索用时 31 毫秒
1.
Dražen Adamović 《Algebras and Representation Theory》2004,7(4):457-469
Let
be the affine Lie algebra associated to the simple finite-dimensional Lie algebra
. We consider the tensor product of the loop
-module
associated to the irreducible finite-dimensional
-module V() and the irreducible highest weight
-module L
k,. Then L
k, can be viewed as an irreducible module for the vertex operator algebra M
k,0. Let A(L
k,) be the corresponding
-bimodule. We prove that if the
-module
is zero, then the
-module
is irreducible. As an example, we apply this result on integrable representations for affine Lie algebras. 相似文献
2.
G. A. Kalyabin 《Functional Analysis and Its Applications》2004,38(3):184-191
We solve Tikhomirov's problem on the explicit computation of sharp constants in the Kolmogorov type inequalities
Specifically, we prove that
for all and k{0,...,n-1}. We establish symmetry and regularity properties of the numbers A
n,k
and study their asymptotic behavior as n for the cases k=O(n
2/3) and k/n(0,1).Similar problems were previously studied by Gabushin and Taikov. 相似文献
3.
In this paper we consider the weakly coupled elliptic system with critical growth
where a, b, c, d are C
1-functions defined in a bounded regular domain of
N
. Here we construct families of solutions which blow-up and concentrate at some points in as the positive parameter goes to zero.*The authors are supported by M.I.U.R., project Metodi variazionali e topologici nello studio di fenomeni non lineari. 相似文献
4.
Andrzej Nowik 《Czechoslovak Mathematical Journal》2000,50(4):865-877
We prove the following theorems:1. There exists an -covering with the property s
0.2. Under cov
there exists X such that
is not an -covering orX \ B is not an -covering].3. Also we characterize the property of being an -covering. 相似文献
5.
M. S. Lyapina 《Journal of Mathematical Sciences》2004,120(2):1109-1116
A bi-Lipschitz continuous mapping of a space X is a bijection
such that
, where
. We write
if f is a Lipschitz (bi-Lipschitz) mapping of X into itself and denote by
the set of all bi-Lipschitz mappings of X that are not isometry. Thus,
if
and blip
. For X we consider a standard Cantor set K on the real line (with standard metric). The main result of this paper is formulated as follows:
where
Bibliography: 2 titles. 相似文献
6.
Sufficient conditions for the nth order linear differential equation
, to have Property A or Property B are established in both the delayed and the advanced cases. These conditions essentially improve many known results not only for differential equations with deviating arguments but for ordinary differential equations as well. 相似文献
7.
Bruno Kahn 《K-Theory》2002,25(2):99-139
Let A be a commutative semi-local ring containing 1/2. We construct natural isomor-phisms
if A is nonexceptional. We deduce that, for a nonexceptional scheme X quasi-projective or regular over Z[1/2], the groups K
n(X,Z/2) and
are finite for n dim(X)-1. When X is a variety over F
p or Q
p with p odd, we also obtain finiteness results for K
*(X) and
. Finally, using higher Chern classes with values in truncated étale cohomology, we show that, for X over Z[1/2], of Krull dimension d, quasi-projective over an affine base (resp. smooth over a field or a discrete valua-tion ring), K
n(X,Z/2) is isomorphic for n 3 (resp. for n 2) to
, up to controlled torsion depending only on n and d (not on ). Here, is the projection from the étale site of X to its Zariski site and denotes truncation in the derived category. 相似文献
8.
Adhemar Bultheel Pablo González-Vera Erik Hendriksen Olav Njåstad 《Acta Appl Math》2000,61(1-3):101-118
From the Erds–Turán theorem, it is known that if f is a continuous function on
and L
n
(f, z) denotes the unique Laurent polynomial interpolating f at the (2 n + 1)th roots of unity, then
Several years later, Walsh and Sharma produced similar result but taking into consideration a function analytic in
and continuous on
and making use of algebraic interpolating polynomials in the roots of unity.In this paper, the above results will be generalized in two directions. On the one hand, more general rational functions than polynomials or Laurent polynomials will be used as interpolants and, on the other hand, the interpolation points will be zeros of certain para-orthogonal functions with respect to a given measure on
. 相似文献
9.
Conditions are found upon satisfaction of which the differential equation
相似文献
10.
Klaus Reuter 《Order》1989,6(3):277-293
It is known that for incidence structures
and
, max
, wheref dim stands for Ferrers relation. We shall show that under additional assumptions on
and
, both bounds can be improved. Especially it will be shown that the square of a three-dimensional ordered set is at least four-dimensional. 相似文献
11.
A Littlewood-Paley type
inequality 总被引:2,自引:0,他引:2
In this note we prove the following theorem: Let u be a
harmonic function in the unit ball
and
. Then there is a
constant C =
C(p,
n) such that
12.
Let
be i.i.d. random variables and let, for each
and
. It is shown that
a.s. whenever the sequence of self-normalized sums S
n
/V
n is stochastically bounded, and that this limsup is a.s. positive if, in addition, X is in the Feller class. It is also shown that, for X in the Feller class, the sequence of self-normalized sums is stochastically bounded if and only if
相似文献
13.
In this paper, we consider several constructions which from a given B-product *
B
lead to another one
We shall be interested in finding what algebraic properties of the ring
are shared also by the ring
. In particular, for some constructions the rings R
B and
will be isomorphic and therefore have the same algebraic properties. 相似文献
14.
A formula of a radial derivative
is obtained with the aid of derivatives with respect to and to of the functions closely connected with the spherical Poisson integral
and the boundary values are determined for
. The boundary values are also found for partial derivatives with respect to the Cartesian coordinates
. 相似文献
15.
H. P. A. Künzi S. Romaguera M. A. Sánchez-Granero 《Czechoslovak Mathematical Journal》2004,54(1):215-228
We characterize those Tychonoff quasi-uniform spaces
for which the Hausdorff-Bourbaki quasi-uniformity is uniformly locally compact on the family
of nonempty compact subsets of X. We deduce, among other results, that the Hausdorff-Bourbaki quasi-uniformity of the locally finite quasi-uniformity of a Tychonoff space Xis uniformly locally compact on
if and only if Xis paracompact and locally compact. We also introduce the notion of a co-uniformly locally compact quasi-uniform space and show that a Hausdorff topological space is -compact if and only if its (lower) semi-continuous quasi-uniformity is co-uniformly locally compact. A characterization of those Hausdorff quasi-uniform spaces
for which the Hausdorff-Bourbaki quasi-uniformity is co-uniformly locally compact on
is obtained. 相似文献
16.
We consider a random instance I of k-SAT with n variables and m clauses, where k=k(n) satisfies k—log2
n. Let m
0=2
k
nln2 and let =(n)>0 be such that n. We prove that
17.
We show that the linear discrepancy of a totally
unimodular m×n matrix A is at most
18.
Efficient Estimation in a Semiparametric Autoregressive Model 总被引:3,自引:0,他引:3
Anton Schick 《Statistical Inference for Stochastic Processes》1999,2(1):69-98
This paper constructs efficient estimates of the parameter in the semiparametric auto-regression model
,with a smooth function and independent and identically distributed innovations
t
with zero means and finite variances. This will be done under the assumptions that
and that the errors have a density with finite Fisher information for location. The former condition guarantees that the process can be chosen to be stationary and ergodic. 相似文献
19.
Let P
k be a path on k vertices. In an earlier paper we have proved that each polyhedral map G on any compact 2-manifold
with Euler characteristic
contains a path P
k such that each vertex of this path has, in G, degree
. Moreover, this bound is attained for k = 1 or k 2, k even. In this paper we prove that for each odd
, this bound is the best possible on infinitely many compact 2-manifolds, but on infinitely many other compact 2-manifolds the upper bound can be lowered to
. 相似文献
20.
T. S. Kopaliani 《Czechoslovak Mathematical Journal》2004,54(3):791-805
In this paper the notions of uniformly upper and uniformly lower -estimates for Banach function spaces are introduced. Further, the pair (X, Y) of Banach function spaces is characterized, where X and Y satisfy uniformly a lower -estimate and uniformly an upper -estimate, respectively. The integral operator from X into Y of the form
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