Results 41 to 50 of about 60,182 (167)

Toric mirror symmetry revisited

Comptes Rendus. Mathématique, 2022
The Cox construction presents a toric variety as a quotient of affine space by a torus. The category of coherent sheaves on the corresponding stack thus has an evident description as invariants in a quotient of the category of modules over a polynomial ...
Shende, Vivek
doaj   +1 more source

On weakly clean rings

Communications in Algebra, 2016
ABSTRACTA ring is called clean if every element is a sum of a unit and an idempotent, while a ring is said to be weakly clean if every element is either a sum or a difference of a unit and an idempotent. Commutative weakly clean rings were first discussed by Anderson and Camillo [2] and were extensively investigated by Ahn and Anderson [1], motivated ...
Kosan, Tamer, Sahinkaya, Serap, Zhou, Yiqiang   +2 more
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Different mechanisms of phosphorus transformation in calcareous and acid soils affected by ammonium polyphosphate

Geoderma
The effects of ammonium polyphosphate (APP, (NH4)n+2PnO3n+1, n 
Yang Luo, Yaoli Su, Minghui Huang, Yang Li, Dehua Xu, Zhengjuan Yan, Xinlong Wang   +6 more
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m-rnc rings [PDF]

BIO Web of Conferences
In this article, an element w of an associative ring R is called m-regular nil clean or m-rnc if expressed as w = am + b where am is m-regular element and b is a nilpotent element. R is named m-regular nil clean ring or m-rnc ring. If all the elements of
Mahmood Ali Sh., Mohammed Ibraheem Zubaida   +1 more
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Pembuatan alat pemurni air laut skala besar untuk memenuhi kebutuhan air bersih di SMA Negeri 1 Rupat daerah pesisir Provinsi Riau

Riau Journal of Empowerment, 2022
Rupat Island located at a coastal area of Riau Province, generally coastal areas are identical with the availability of clean water. The low availability of clean water has a negative impact on all sectors.
Ernidawati Ernidawati, Azizahwati Azizahwati, Defni Satria, Annisa Jannata Firdausi, Maria Desfina Sitorus, Aldi Syahrul Khunaivi, Anisa Siti Nurhasanah, Elvira Elvira, Raihan Syadza Suratman, Yuniati Efalingga, Yupika Yupika, Sry Khayrani br. Sinaga, Widari Cania   +12 more
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On graded nil clean rings [PDF]

Communications in Algebra, 2018
In this paper we introduce and study the notion of a graded (strongly) nil clean ring which is group graded. We also deal with extensions of graded (strongly) nil clean rings to graded matrix rings and to graded group rings. The question of when nil cleanness of the component, which corresponds to the neutral element of a group, implies graded nil ...
Ilic-Georgijevic, Emil, Sahinkaya, Serap
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⁎-Clean rings; some clean and almost clean Baer ⁎-rings and von Neumann algebras

Journal of Algebra, 2010
A ring is clean (resp. almost clean) if each of its elements is the sum of a unit (resp. regular element) and an idempotent. In this paper we define the analogous notion for *-rings: a *-ring is *-clean (resp. almost *-clean) if its every element is the sum of a unit (resp. regular element) and a projection.
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Rings in Which Element is a Sum of the Transformation Elements of Idempotents and Special Elements

Journal of Mathematics
In this article, further generalizations are made for the nil clean ring and the ur-clean ring, obtained as extensions of the clean ring. Firstly, consider rings where each element can be expressed as n idempotents plus one nilpotent, any two commute ...
Xinsong Yang, Jiaxin Liu
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Efficient synthesis of ethyl 2-(oxazolin-2-yl)alkanoates via ethoxycarbonylketene-induced electrophilic ring expansion of aziridines

Beilstein Journal of Organic Chemistry, 2022
Alkyl 2-diazo-3-oxoalkanoates generate alkoxycarbonylketenes, which undergo an electrophilic ring expansion with aziridines to afford alkyl 2-(oxazolin-2-yl)alkanoates in good to excellent yields under microwave heating.
Yelong Lei, Jiaxi Xu
doaj   +1 more source

Classes of Commutative Clean Rings [PDF]

Annales de la Faculté des sciences de Toulouse : Mathématiques, 2010
Let A be a commutative ring with identity and I an ideal of A. A is said to be I-clean if for every element a∈A there is an idempotent e=e 2 ∈A such that a-e is a unit and ae belongs to I. A filter of ideals, say ℱ, of A is Noetherian if for each I∈ℱ there is a finitely generated ideal J∈ℱ such that J⊆I.
Iberkleid, Wolf, McGovern, Warren William   +1 more
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