Results 31 to 40 of about 32,538 (166)
PRESIMPLIFIABLE AND WEAKLY PRESIMPLIFIABLE RINGS
Barekeng, 2023 Let be a commutative ring with identity. Two elements and b in are called to be associates if and , or equivalently, if . The generalization of associate relation in R has given the idea for definitions of presimplifiable and weakly presimplifiable
Deby Anastasya, Sri Wahyuni
doaj +1 more source
Strongly Hopfian subrings of power series rings
Mathematics OpenThe main purpose of this paper is to study the transfer of the strongly Hopfian property to subrings of power series rings. Let A be a commutative ring with identity element and I an arbitrary ideal of A.
Abdelamir Dabbabi, Ali Benhissi
doaj +1 more source
The ~ 2400-year cycle in atmospheric radiocarbon concentration: bispectrum of 14C data over the last 8000 years [PDF]
Annales Geophysicae, 2002 We have carried out power spectrum, time-spectrum and bispectrum analyses of the long-term series of the radiocarbon concentrations deduced from measurements of the radiocarbon content in tree rings for the last 8000 years.
S. S. Vasiliev +3 more
doaj +1 more source
Results in Physics, 2023 A dual-band, polarization-insensitive, wide-angle metasurface array is presented in this article for electromagnetic (EM) energy harvesting in the UMTS-2100 band and Wi-Fi band.
Yiqing Wei +7 more
doaj +1 more source
Positivity in power series rings [PDF]
advg, 2009 Abstract We extend and generalize results of Scheiderer (2006) on the representation of polynomials nonnegative on two-dimensional basic closed semialgebraic sets. Our extension covers some situations where the defining polynomials do not satisfy the transversality condition.
Cimpri, Jaka +2 more
openaire +2 more sources
Nilpotent Elements in Skew Polynomial Rings [PDF]
Journal of Sciences, Islamic Republic of Iran, 2017 Letbe a ring with an endomorphism and an -derivationAntoine studied the structure of the set of nilpotent elements in Armendariz rings and introduced nil-Armendariz rings.
M. Azimi, A. Moussavi
doaj
Efficient D-π-π-A-Type Dye Sensitizer Based on a Benzothiadiazole Moiety: A Computational Study
Molecules, 2023 The design of highly efficient sensitizers is one of the most significant areas in dye-sensitized solar cell (DSSC) research. We studied a series of benzothiadiazole-based D-π-π-A organic dyes, putting emphasis on the influence of the donor moiety on the
Fatma M. Mustafa +3 more
doaj +1 more source
NILRADICALS OF SKEW POWER SERIES RINGS
Bulletin of the Korean Mathematical Society, 2004 Let \(R\) be an associative ring with identity and let \({\mathcal P}(R)\), \(N_r(R)\) and \({\mathcal N}(R)\) denote the prime radical, the upper nilradical and the set of all nilpotent elements of \(R\), respectively. \(R\) is \(2\)-primal if \({\mathcal P}(R)={\mathcal N}(R)\) and \(R\) is reduced if \({\mathcal N}(R)=0\).
Hong, Chan Yong +2 more
openaire +2 more sources
PS-Modules over Ore Extensions and Skew Generalized Power Series Rings
International Journal of Mathematics and Mathematical Sciences, 2015 A right R-module MR is called a PS-module if its socle, SocMR, is projective. We investigate PS-modules over Ore extension and skew generalized power series extension.
Refaat M. Salem +2 more
doaj +1 more source
Dimension theory in power series rings [PDF]
Pacific Journal of Mathematics, 1970 each ie ω0} and we define A R [[X]] to be the ideal of R [[X]] which is generated by A. Then A R [[X]] = {f(X): Af S B for some finitely generated ideal B of R with B £ A}. It is clear that A iϋ [[X]] S A [[X]]; equality holds if and only if each countably generated ideal of R contained in A is contained in a finitely generated ideal of R contained in ...
openaire +2 more sources