共查询到20条相似文献,搜索用时 31 毫秒
1.
Anthony Hayes 《Semigroup Forum》2004,68(2):218-232
We investigate E*-dense semi\-groups as analogues of E-densesemigroupsfor semigroups with zero. We give a characterisation theorem forE*-dense semigroups whose idempotents form a *-rectangularband. The construction methods of generalised Rees matrix semigroupsare employed to provide examples and illustrations. Our results areanalogous to those of Weipoltshammer for E-dense semigroups. 相似文献
2.
A convex d-polytope in ℝ
d
is called edge-antipodal if any two vertices that determine an edge of the polytope lie on distinct parallel supporting hyperplanes
of the polytope. We introduce a program for investigating such polytopes, and examine those that are simple.
相似文献
3.
A. S. Kondrat’ev 《Proceedings of the Steklov Institute of Mathematics》2015,289(1):139-145
It is proved that the groups E 7(2) and E 7(3) are recognizable by their prime graphs. As a corollary, this completes the proof of V.D. Mazurov’s conjecture that every finite simple group whose prime graph has at least three connected components is either recognizable by spectrum or isomorphic to A 6. 相似文献
4.
Akhlad Iqbal Shahid Ali I. Ahmad 《Journal of Optimization Theory and Applications》2012,155(1):239-251
In this paper, we introduce a new class of sets and a new class of functions called geodesic E-convex sets and geodesic E-convex functions on a Riemannian manifold. The concept of E-quasiconvex functions on R n is extended to geodesic E-quasiconvex functions on Riemannian manifold and some of its properties are investigated. Afterwards, we generalize the notion of epigraph called E-epigraph and discuss a characterization of geodesic E-convex functions in terms of its E-epigraph. Some properties of geodesic E-convex sets are also studied. 相似文献
5.
A. A. Buturlakin 《Siberian Mathematical Journal》2016,57(5):769-777
We describe the spectra of simple and universal groups of Lie type E7. 相似文献
6.
Given 1≤ p,q < ∞, let BLpLq be the class of all Banach lattices X such that X is isometrically lattice isomorphic to a band in some Lp(Lq)-Banach lattice. We show that the range of a positive contractive projection on any BLpLq-Banach lattice is itself in BLpLq. It is a consequence of this theorem and previous results that BLpLq is first-order axiomatizable in the language of Banach lattices. By studying the pavings of arbitrary BLpLq-Banach lattices by finite dimensional sublattices that are themselves in this class, we give an explicit set of axioms for
BLpLq. We also consider the class of all sublattices of Lp(Lq)-Banach lattices; for this class (when p/q is not an integer) we give a set of axioms that are similar to Krivine’s well-known axioms for the subspaces of Lp-Banach spaces (when p/2 is not an integer). We also extend this result to the limiting case q = ∞. 相似文献
7.
We give closed form evaluations for many families of integrals, whose integrands contain algebraic functions of the complete elliptic integrals K and E. Our methods exploit the rich structures connecting complete elliptic integrals, Jacobi theta functions, lattice sums, and Eisenstein series. Various examples are given, and along the way new (including 10-dimensional) lattice sum evaluations are produced. 相似文献
8.
The lattice vertex operator algebra VL associated to a positive definite even lattice L has an automorphism of order 2 lifted from –1-isometry of L. The fixed point set VL+ of VL for the automorphism is naturally a vertex operator algebra. We prove that any 0-graded weak VL+-module is completely reducible.Supported by JSPS Research Fellowships for Young Scientists. 相似文献
9.
Winfried K. Grassmann 《Methodology and Computing in Applied Probability》2011,13(4):873-886
In 1953, Smith (Proc Camb Philos Soc 49:449–461, 1953), and, following him, Syski (1960) suggested a method to find the waiting time distribution for one server queues with Erlang-n arrivals and Erlang-m service times by using characteristic roots. Syski shows that these roots can be determined from a very simple equation,
but an equation of degree n + m. Syski also shows that almost all of the characteristic roots are complex. In this paper, we derive a set of equations, one
for each complex root, which can be solved by Newton’s method using real arithmetic. This method simplifies the programming
logic because it avoids deflation and the subsequent polishing of the roots. Using the waiting time distribution, Syski then
derived the distribution of the number in the system after a departure. E
n
/E
m
/1 queues can also formulated as quasi birth-death (QBD) processes, and in this case, the characteristic roots discussed by
Syski are closely related to the eigenvalues of the QBD process. The QBD process provides information about the number in
system at random times, but they are much more difficult to formulate and solve. 相似文献
10.
V. L. Smith 《The Journal of the Operational Research Society》1985,36(4):327-332
Approximation formulae are suggested for the mean and variance of customers in M/E n /s queues. It is shown that the distributions can be approximated by using the mean and variance to fit Gamma functions. A brief comment on the more general E m /E n /s case is given. 相似文献
11.
Michael Joachim 《Mathematische Annalen》2003,327(4):641-670
We define K-homology groups K
*
() for small C
*
-categories in terms of Hilbert modules over the C
*
-category . We also define a functor A
f
from the category of small C
*
-categories into the category of C
*
-algebras and show that there is a natural isomorphism
. In addition, we give an easy construction of a functor
from the category of C
*
-algebras into the category of symmetric spectra which represents K-homology, i.e. we show that the functor
comes with a natural isomorphism
for C
*
-algebras A. It then follows that the composition
A
f
provides a functor that can be used in the Davis-Lück approach for constructing the Baum-Connes map. 相似文献
12.
We compute the monoid V(L
K
(E)) of isomorphism classes of finitely generated projective modules over certain graph algebras L
K
(E), and we show that this monoid satisfies the refinement property and separative cancellation. We also show that there is
a natural isomorphism between the lattice of graded ideals of L
K
(E) and the lattice of order-ideals of V(L
K
(E)). When K is the field of complex numbers, the algebra is a dense subalgebra of the graph C
*-algebra C
*(E), and we show that the inclusion map induces an isomorphism between the corresponding monoids. As a consequence, the graph
C*-algebra of any row-finite graph turns out to satisfy the stable weak cancellation property.
The first author was partially supported by the DGI and European Regional Development Fund, jointly, through Project BFM2002-01390,
the second and the third by the DGI and European Regional Development Fund, jointly, through Project MTM2004-00149 and by
PAI III grant FQM-298 of the Junta de Andalucía. Also, the first and third authors are partially supported by the Comissionat
per Universitats i Recerca de la Generalitat de Catalunya. 相似文献
13.
A subgroup H of a finite group G is said to be c*-supplemented in G if there exists a subgroup K such that G = HK and H ⋂ K is permutable in G. It is proved that a finite group G that is S
4-free is p-nilpotent if N
G
(P) is p-nilpotent and, for all x ∈ G\N
G
(P), every minimal subgroup of
is c*-supplemented in P and (if p = 2) one of the following conditions is satisfied: (a) every cyclic subgroup of
of order 4 is c*-supplemented in P, (b)
, (c) P is quaternion-free, where P a Sylow p-subgroup of G and
is the p-nilpotent residual of G. This extends and improves some known results.
Published in Ukrains’kyi Matematychnyi Zhurnal, Vol. 59, No. 8, pp. 1011–1019, August, 2007. 相似文献
14.
The paper extends the two notions of the dual mixed volumes and L
p
-intersection body to q-dual mixed volumes and L
p
-mixed intersection body, respectively. Inequalities for the star dual of L
p
-mixed intersection bodies are established. 相似文献
15.
For a newform f for Γ0(N) of even weight k supersingular at a prime p ≥ 5, by using infinite dimensional p-adic analysis, we prove that the p-adic L-function L
p
(f,α; χ) has finite order of vanishing at any character of the form [(c)\tilde] s ( x ) = xs\tilde \chi _s \left( x \right) = x^s. In particular, under the natural embedding of ℤ
p
in the group of ℂ*
p
-valued continuous characters of ℤ*
p
, the order of vanishing at any point is finite. 相似文献
16.
Let k be a field and E(n) be the 2
n+1-dimensional pointed Hopf algebra over k constructed by Beattie, Dăscălescu and Grünenfelder [J. Algebra, 2000, 225: 743–770]. E(n) is a triangular Hopf algebra with a family of triangular structures R
M
parameterized by symmetric matrices M in M
n
(k). In this paper, we study the Azumaya algebras in the braided monoidal category $
E_{(n)} \mathcal{M}^{R_M }
$
E_{(n)} \mathcal{M}^{R_M }
and obtain the structure theorems for Azumaya algebras in the category $
E_{(n)} \mathcal{M}^{R_M }
$
E_{(n)} \mathcal{M}^{R_M }
, where M is any symmetric n×n matrix over k. 相似文献
17.
A new functor from <Emphasis Type="Italic">D</Emphasis><Subscript>5</Subscript>-Mod to <Emphasis Type="Italic">E</Emphasis><Subscript>6</Subscript>-Mod 下载免费PDF全文
Xiao Ping Xu 《数学学报(英文版)》2016,32(8):867-892
We find a new representation of the simple Lie algebra of type E 6 on the polynomial algebra in 16 variables, which gives a fractional representation of the corresponding Lie group on 16-dimensional space. Using this representation and Shen’s idea of mixed product, we construct a new functor from D 5-Mod to E 6-Mod. A condition for the functor to map a finite-dimensional irreducible D 5-module to an infinite-dimensional irreducible E 6-module is obtained. Our results yield explicit constructions of certain infinite-dimensional irreducible weight E6-modules with finite-dimensional weight subspaces. In our approach, the idea of Kostant’s characteristic identities plays a key role. 相似文献
18.
Let D be an infinite division ring. A famous result due to Herstein says that every non-central element of D has infinitely many conjugates and so, if D
* is an FC-group, then D is a field. Let M be a maximal subgroup of GL
n
(D), where n ≥ 1. In this paper, we prove that if M is an FC-group, then it is the multiplicative group of some maximal subfield of M
n
(D). Moreover, if M is algebraic over Z(D), then [D : Z(D)] < ∞. 相似文献
19.
In this paper, we give a class of C*-algebras with non-stable K
1-group property which include the example non-simple tracial topological rank zero and stable rank two C*-algebra given by Lin and Osaka. 相似文献
20.
Novikov superalgebras are related to quadratic conformal superalgebras which correspond to the Hamiltonian pairs and play
a fundamental role in completely integrable systems. In this note we show that the Novikov superalgebras with A
0 = A
1
A
1 and dim A
1 = 2 are of type N and give a class of Novikov superalgebras of type S with A
0 = A
1
A
1. 相似文献