14,328 research outputs found
Generalized Steinberg representations of split reductive linear algebraic groups
We generalize results of P. Schneider and U. Stuhler for GL_l+1 to a
reductive algebraic group G defined and split over a non-archimedean local
field K. Following their lines, we prove that the generalized Steinberg
representations of G with coefficients in any abelian group are cyclic. When G
is semi-simple of adjoint type, we give an expression of these representations,
whenever it is possible and in particular for those that are of maximal degree,
in terms of the parahoric subgroups of G.Comment: 17 page
Closed-Form Likelihood Expansions for Multivariate Diffusions
This paper provides closed-form expansions for the transition density and likelihood function of arbitrary multivariate diffusions. The expansions are based on a Hermite series, whose coefficients are calculated explicitly by exploiting the special structure afforded by the diffusion hypothesis. Because the transition function for most diffusion models is not known explicitly, the expansions of this paper can help make maximum-likelihood a practical estimation method for discretely sampled multivariate diffusions. Examples of interest in financial econometrics are included.
Fisher's Information for Discretely Sampled Levy Processes
This paper studies the asymptotic behavior of the Fisher information for a
Levy process discretely sampled at an increasing frequency. We show that it is
possible to distinguish not only the continuous part of the process from its
jumps part, but also different types of jumps, and derive the rates of
convergence of efficient estimators.Comment: 17 novembre 200
Torus knots that cannot be untied by twisting
We give a necessary condition for a torus knot to be untied by a single
twisting. By using this result, we give infinitely many torus knots that cannot
be untied by a single twisting.Comment: LaTeX, 12 pages, to appear in Revista Matem\'{a}tica Complutens
Providing Delay Guarantees in Bluetooth
Bluetooth polling, also referred to as Bluetooth MAC scheduling or intra-piconet scheduling, is the mechanism that schedules the traffic between the participants in a Bluetooth network. Hence, this mechanism is highly determining with respect to the delay packets experience in a Bluetooth network. In this paper we present a polling mechanism that provides delay guarantees in an efficient manner and we evaluate this polling mechanism by means of simulation. It is shown that this polling mechanism is able to provide delay guarantees while saving as much as possible resources, which can be used for transmission of best effort traffic or for retransmission
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