Results 61 to 70 of about 9,956,543 (298)

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
Xu, Yuan, Cheney, E. W.
openaire   +2 more sources

Semigroups with positive definite structure

, 1973
Let G G be a semigroup with the identity 1 and an involution x → x ∗ x \to {x^ \ast } . One can define a complex-valued and an
Parfeny P. Saworotnow
core   +1 more source

Risk of Retinopathy Associated with Long‐Term Use of Hydroxychloroquine in Patients with Rheumatic Diseases: A Systematic Review and Meta‐Analysis

Arthritis Care &Research, EarlyView.
Objective We aimed to estimate the prevalence and cumulative incidence of hydroxychloroquine retinopathy (HCQ‐R) and its risk factors among patients receiving long‐term HCQ with rheumatic diseases through a systematic review and meta‐analysis of observational studies that used spectral‐domain optical coherence tomography (SD‐OCT) for screening ...
Narsis Daftarian, Chloe Yue, Steve D Levasseur, Hui Xie, J. Antonio Avina‐Zubieta   +4 more
wiley   +1 more source

A dichotomy for a class of positive definite functions [PDF]

Pacific Journal of Mathematics, 1982
We study under which conditions certain positive definite functions on discrete free groups, are weakly associated with the left regular ...
Alesina, Alberto, De Michele, Leonede
openaire   +4 more sources

Triangular Index Ratio as an Alternative Method to the Alpha Angle for Defining the Presence of Cam Morphology: A Prospective Cohort Study

Arthritis Care &Research, EarlyView.
Objective Cam morphology, which is a significant risk factor for hip osteoarthritis, is commonly quantified by the alpha angle (AA). This study aims to explore the potential of the triangular index ratio (TIR) to quantify cam morphology on anteroposterior radiographs by assessing the association between TIR‐defined cam morphology and the development of
Jinchi Tang, Fleur Boel, Michiel M. A. van Buuren, Noortje S. Riedstra, Myrthe A. van den Berg, Jos Runhaar, Sita Bierma‐Zeinstra, Rintje Agricola   +7 more
wiley   +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, Despoina Argyropoulou, Cândida Lourenço, João Bastos, Ana Quintas   +4 more
doaj   +1 more source

From Adult to Adolescent: Alignment in Clinical Trials and Outcomes in Axial Spondyloarthritis

Arthritis Care &Research, EarlyView.
Spondyloarthritis (SpA) is a group of chronic inflammatory diseases encompassing axial and peripheral forms, with up to 20% of patients developing symptoms before age 16. Despite this substantial pediatric burden, treatment options for juvenile‐onset SpA (JSpA), particularly those with axial disease (axJSpA), remain limited.
Pamela F. Weiss, Judith A. Smith, Robert A. Colbert, Erin Treemarcki, Michael H. Weisman, Walter P. Maksymowych, Hermine I. Brunner, for the Childhood Arthritis and Rheumatology Research Alliance, Spondyloarthritis Research and Treatment Network, and Pediatric Rheumatology Collaborative Study Group Advisory Council   +9 more
wiley   +1 more source

Fourth-Order Four-Point Boundary Value Problem: A Solutions Funnel Approach

International Journal of Mathematics and Mathematical Sciences, 2012
We investigate the existence of positive or a negative solution of several classes of four-point boundary-value problems for fourth-order ordinary differential equations.
Panos K. Palamides, Alex P. Palamides
doaj   +1 more source

Microvascular damage is associated with carotid wall structural changes in Systemic Sclerosis: a capillaroscopy and ultrasound‐based observational study

Arthritis Care &Research, Accepted Article.
Introduction Systemic sclerosis (SSc) is characterized by cardiovascular risk excess not fully explained by traditional factors. Whether the severity of microvascular damage correlates with structural subclinical atherosclerosis remains unclear. We investigated the relationship between nailfold videocapillaroscopy (NVC) abnormalities and carotid ...
Eugenio Capparelli, Luca Clerici, Francesco Lapia, Giusy C. Moltisanti, Eleonora Zaccara, Greta Pellegrino, Daniela Bompane, Francesca Capelli, Letizia Ferrami, Laura Castelnovo, Antonio Tamburello, Maria Sole Chimenti, Paola Faggioli, Antonino Mazzone   +13 more
wiley   +1 more source

Function extraction via Chebyshev interpolation of quantum integral estimates

Physical Review Research
We present an algorithm for extracting a smooth, positive-definite function ψ(x) encoded in a quantum state vector of size 2^{n}, while avoiding exponentially suppressed subnormalization of a naive extraction step. The method addresses a known limitation
Gumaro Rendón
doaj   +1 more source