Results 11 to 20 of about 816 (251)
A generalization of projective covers
Journal of Algebra, 2008 The authors generalize the notion of a projective cover of a module to the projective \(I\)-cover of a module for an ideal \(I\) of a ring \(R\). They prove that a ring \(R\) is \(I\)-semiregular if and only if every cyclically presented \(R\)-module has a projective \(I\)-cover.
Alkan, Mustafa +2 more
openaire +4 more sources
Krull–Schmidt categories and projective covers
Expositiones Mathematicae, 2015 Krull-Schmidt categories are additive categories such that each object decomposes into a finite direct sum of indecomposable objects having local endomorphism rings. We provide a self-contained introduction which is based on the concept of a projective cover.
Henning Krause
openaire +4 more sources
Covering Rational Surfaces with Rational Parametrization Images
Mathematics, 2021 Let S be a rational projective surface given by means of a projective rational parametrization whose base locus satisfies a mild assumption. In this paper we present an algorithm that provides three rational maps f,g,h:A2⇢S⊂Pn such that the union of the ...
Jorge Caravantes +3 more
doaj +1 more source
Geometric correction for satellite image of Mosul city using 3D methods
Journal of Kufa-Physics, 2020 The important preprocessing techniques for remote sensing data and geometrical alteration is the geometric correction. In this paper ,it covers two models which are used in to three dimensions the physical model and the projective Transformation for ...
Israa Hussein, Nawal K.Ghazal
doaj +1 more source
Semihollow-Lifting Modules and Projectivity
مجلة بغداد للعلوم, 2022 Throughout this paper, T is a ring with identity and F is a unitary left module over T. This paper study the relation between semihollow-lifting modules and semiprojective covers. proposition 5 shows that If T is semihollow-lifting, then every semilocal
Anfal Hasan Dheyab +2 more
doaj +1 more source
Modern Technologies and Scientific and Technological Progress, 2020 The actual problems, being of world importance: environmental protection, planet pollution, charity are considered.
Alena Boycova, Nadezhda Grin
openaire +2 more sources
Assessing uncertainties in land cover projections [PDF]
Global Change Biology, 2016 AbstractUnderstanding uncertainties in land cover projections is critical to investigating land‐based climate mitigation policies, assessing the potential of climate adaptation strategies and quantifying the impacts of land cover change on the climate system.
Alexander, Peter +37 more
openaire +8 more sources
Bright, dark, periodic and kink solitary wave solutions of evolutionary Zoomeron equation
Results in Physics, 2022 The modified auxiliary equation (MAE) approach and the generalized projective Riccati equation (GPRE) method are used for the first time to solve Zoomeron problem which provided different types of exact traveling wave solutions, including some new ...
Shao-Wen Yao +5 more
doaj +1 more source
Epimorphisms and maximal covers in categories of compact spaces
Applied General Topology, 2013 The category C is "projective complete"if each object has a projective cover (which is then a maximal cover). This property inherits from C to an epireflective full subcategory R provided the epimorphisms in R are also epi in C. When this condition fails,
B. Banaschewski, A.W. Hager
doaj +1 more source
δss-supplemented modules and rings
Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2020 In this paper, we introduce the concept of δss-supplemented modules and provide the various properties of these modules. In particular, we prove that a ring R is δss-supplemented as a left module if and only if RSoc(RR){R \over {Soc\left( {_RR} \right)}}
Türkmen Burcu Nişancı +1 more
doaj +1 more source