Results 51 to 60 of about 63,706 (205)
On characterizing potential friends of 20
Annals of the West University of Timisoara: Mathematics and Computer ScienceDoes 20 have a friend? Or is it a solitary number? A folklore conjecture asserts that 20 has no friends, i.e., it is a solitary number. In this article, we prove that a friend N of 20 is of the form N = 2 · 52a ·m2, with (3;m) = (7;m) = 1 and it has at ...
Chatterjee Tapas +2 more
doaj +1 more source
The volume of an isolated singularity
, 2011 We introduce a notion of volume of a normal isolated singularity that generalizes Wahl's characteristic number of surface singularities to arbitrary dimensions. We prove a basic monotonicity property of this volume under finite morphisms. We draw several
Boucksom, Sebastien +2 more
core +3 more sources
, 2010 Using the language of polyhedral divisors and divisorial fans we describe invariant divisors on normal varieties X which admit an effective codimension one torus action.
A. Liendo +9 more
core +1 more source
Time‐resolved XPCS analysis across broad time‐scales using multi‐tau two‐time correlations
Journal of Synchrotron Radiation, EarlyView.A scalable multi‐tau two‐time correlation framework enables efficient, time‐resolved XPCS analysis of long duration high‐frame‐rate modern synchrotron data while preserving sensitivity to non‐stationary dynamics.We present a multi‐tau two‐time correlation (MT‐2TC) analysis for X‐ray photon correlation spectroscopy that enables efficient analysis of ...
Fabio Brugnara +13 more
wiley +1 more source
Prime divisors of some shifted products
International Journal of Mathematics and Mathematical Sciences, 2005 We study prime divisors of various sequences of positive integers A(n)+1, n=1,…,N, such that the ratios a(n)=A(n)/A(n−1) have some number-theoretic or combinatorial meaning.
Eric Levieil +2 more
doaj +1 more source
On contractible curves on normal surfaces
, 1999 We characterize contractible curves on proper normal algebraic surfaces in terms of complementary Weil divisors. Using this we generalize the classical criteria of Castelnuovo and Artin. As application we derive a finiteness result on homogeneous spectra
Schroeer, Stefan
core +2 more sources
Predictors of reduced length of stay in minimally invasive colectomy, a 20‐year study
Surgical Practice, EarlyView.Abstract Purpose Minimally invasive colorectal resection is a common surgical procedure indicated for a variety of malignant and benign conditions. Length of stay (los) is an important metric in the evaluation of surgical care quality and healthcare expenditure.
Elisa Tran +4 more
wiley +1 more source
A characterization of the algebra of holomorphic functions on a simply connected domain
International Journal of Mathematics and Mathematical Sciences, 1989 Let A be a singly-generated ℱ-algebra. It is shown that A isomorphic to H(Ω) where Ω is a simply connected domain in ℂ if and only if A has no topological divisors of zero.
Derming Wang, Saleem Watson
doaj +1 more source
Normal crossing properties of complex hypersurfaces via logarithmic residues
, 2014 We introduce a dual logarithmic residue map for hypersurface singularities and use it to answer a question of Kyoji Saito. Our result extends a theorem of L\^e and Saito by an algebraic characterization of hypersurfaces that are normal crossing in ...
Aleksandrov +13 more
core +1 more source
A fast metaheuristic approach for the planar multiple obnoxious facility location problem
International Transactions in Operational Research, EarlyView.Abstract The multiple obnoxious facility location problem is one of the most studied problems in the literature of the obnoxious facility location problems family. In this work, we propose an alternative algorithmic approach for this problem, based on an efficient metaheuristic procedure over a discretization of the plane based on Voronoi diagrams ...
Sergio Salazar +2 more
wiley +1 more source