Results 41 to 50 of about 808,598 (165)
Multivariate transient price impact and matrix-valued positive definite functions
, 2015 We consider a model for linear transient price impact for multiple assets that takes cross-asset impact into account. Our main goal is to single out properties that need to be imposed on the decay kernel so that the model admits well-behaved optimal ...
Alfonsi, Aurélien +2 more
core +3 more sources
Sampled-Data Control of Singular Systems with Time Delays
Abstract and Applied Analysis, 2014 This paper is concerned with sampled-data controller design for singular systems with time delay. It is assumed that the sampling periods are arbitrarily varying but bounded.
Zheng Minjie +3 more
doaj +1 more source
Mass function and particle creation in Schwarzschild-de Sitter spacetime
, 2013 We construct a mass or energy function for the non-Nariai class Schwarzschild-de Sitter black hole spacetime in the region between the black hole and the cosmological event horizons. The mass function is local, positive definite, continuous and increases
Bhattacharya, Sourav, Lahiri, Amitabha
core +1 more source
Multidimensional negative definite functions on the product of commutative hypergroups
Kuwait Journal of Science, 2016 The main aim of this paper is to give the integral representations for the so called multidimensional negative definite functions defined on the product of commutative hypergroups.
Hossam A Ghany
doaj
Stahl's Theorem (aka BMV Conjecture): Insights and Intuition on its Proof
, 2017 The Bessis-Moussa-Villani conjecture states that the trace of $\exp(A-tB)$ is, as a function of the real variable $t$, the Laplace transform of a positive measure, where $A$ and $B$ are respectively a hermitian and positive semi-definite matrix. The long
Clivaz, Fabien
core +1 more source
Positive Definite Functions on Spheres
Duke Mathematical Journal, 1942 Not ...
openaire +3 more sources
Strictly Positive Definite Functions on Spheres [PDF]
Proceedings of the American Mathematical Society, 1992 A sufficient condition is given for the strict positive-definiteness of a real, continuous function on the m m -dimensional sphere.
Xu, Yuan, Cheney, E. W.
openaire +2 more sources
International Journal of Mathematics and Mathematical Sciences, 2002 We prove, for two free semicircularly distributed selfadjoint elements a and b in a type II1 von Neumann algebra with faithful trace τ, that the function t∈ℝ↦τ(exp(a+itb)) is positive definite.
Mark Fannes, Dénes Petz
doaj +1 more source
Non-positivity of the Wigner function and bounds on associated integrals
, 2003 The Wigner function shares several properties with classical distribution functions on phase space, but is not positive-definite. The integral of the Wigner function over a given region of phase space can therefore lie outside the interval [0,1].
Bracken, A. J., Ellinas, D., Wood, J. G.
core +1 more source
Pelvic Desmoid Tumor: A Rare Case with Difficult Diagnosis and Treatment
Case Reports in Obstetrics and Gynecology, 2022 Desmoid tumors are rare benign neoplasms, with locally aggressive characteristics. Ongoing or previous pregnancy, antecedent trauma, and familial adenomatous polyposis are known risk factors.
Mariana Ormonde +4 more
doaj +1 more source