Results 121 to 130 of about 9,956,543 (298)

Schoenberg's Problem on Positive Definite Functions

, 1992
If $n \ge 3$, $q>2$ and $β> 0$ then the function $\exp(-(|x_1|^q+|x_2|^q+\dots+|x_n|^q)^{β/q})$\ is not positive definite. This result gives an answer to a question posed by I.J.~Schoenberg in 1938. This text is an authorized English translation of the paper published in Russian in Algebra and Analysis 3(1991), \#3, p.78--85.
openaire   +3 more sources

Positive definite functions on a regular domain

IMA Journal of Numerical Analysis
Abstract We define positive and strictly positive definite functions on a domain and study these functions on a list of regular domains. The list includes the unit ball, conic surface, hyperbolic surface, solid hyperboloid and the simplex.
Martin D. Buhmann, Yuan Xu
openaire   +2 more sources

Sparse Coding on Symmetric Positive Definite Manifolds Using Bregman Divergences

, 2016
This paper introduces sparse coding and dictionary learning for symmetric positive definite (SPD) matrices, which are often used in machine learning, computer vision, and related areas. Unlike traditional sparse coding schemes that work in vector spaces,
Lovell, Brian, Sanderson, Conrad, Hartley, Richard, Harandi, Mehrtash T   +3 more
core   +1 more source

Distributed State Estimation for Mobile Robots in LiDAR Sensor Networks With Intermittent Inertial Measurements

Advanced Intelligent Systems, EarlyView.
A scalable distributed observer framework for LiDAR sensor networks is presented for robust tracking and pose estimation of mobile robots. By combining adaptable 3D detection, clustering‐based communication reduction, and intermittent inertial fusion, accurate and efficient estimation is achieved under occlusions and sensing constraints, with formally ...
Isabella Luppi, Ehsan Hashemi
wiley   +1 more source

Maximization of the two-parameter multivariate normal likelihood avoiding logarithm and differentiation

Research in Statistics
We consider the classical problem of maximizing the likelihood function of the mean vector and the dispersion matrix given a sample from the family of multivariate Normal distributions.
Suman Majumdar
doaj   +1 more source

Premium subsidy designs and crowding out of insurance demand

American Journal of Agricultural Economics, EarlyView.
Abstract Crop insurance is an important instrument to protect farmers against extreme weather events. Many countries provide subsidies for crop insurance products to make insurance more affordable for farmers. The Federal Crop Insurance Program in the United States and major European crop insurance programs such as in Spain, Italy, and France focus on ...
Tim Philippi
wiley   +1 more source

Quasianalyticity of Positive Definite Continuous Functions

Publications of the Research Institute for Mathematical Sciences, 2002
It is shown that for a positive definite continuous function f(x) on ℝ^n the followings are equivalent: Moreover, an analogue ...
openaire   +2 more sources

The EXPLAIN Study: Exploring Arthrogryposis Multiplex Congenita in Adults in Norway — A Description of Demographic, Medical, and Neurological Findings

American Journal of Medical Genetics Part C: Seminars in Medical Genetics, EarlyView.
ABSTRACT Arthrogryposis Multiplex Congenita (AMC) encompasses several hundred conditions with diverse genetic, pathophysiological, and clinical origins. The overarching EXPLAIN study explores underlying causes and implications of AMC and represents the largest clinical cohort of adults with AMC reported to date.
My Vuong Hermansen, Kristin Ørstavik, Unni Steen, Mathias Toft, Cathrine Brunborg, Lena Lande Wekre   +5 more
wiley   +1 more source

‘Turkeys Cannot Vote for Christmas’: Why Epistemic Disobedience in an Anti‐Black World Matters

Australian Journal of Social Issues, EarlyView.
ABSTRACT Never in the history of global coloniality has the idea of epistemic disobedience been as important as in the 21st century. This is not only because the struggle for decolonisation has shifted from physical confrontation between the coloniser and the colonised into a battle of ideas but also because the former has deployed the idea of ...
Morgan Ndlovu
wiley   +1 more source

Expectations and Reality: The Lived Experiences of Australians With Psychosocial Disability Within the NDIS

Australian Journal of Social Issues, EarlyView.
ABSTRACT While Australia's National Disability Insurance Scheme (NDIS) was founded on principles of choice and control, for people with significant mental health challenges (what the NDIS calls ‘psychosocial disability’) these ideals often remain elusive. Support systems continue to be fractured and in the context of ongoing policy reforms, it is vital
Joel Hollier, Jennifer Smith‐Merry
wiley   +1 more source