搜索结果: 61-75 共查到“理学 rings”相关记录156条 . 查询时间(0.031 秒)
Construction of schemes over $F_1$, and over idempotent rings: towards tropical geometry
$F_1$ over idempotent rings towards tropical geometry
2010/11/26
In this paper, we give some categorical description of the general spectrum functor, defining it as an adjoint of a global section functor.The general spectrum functor includes that of F1 and of semir...
We give an affirmative answer to the following question by Jarden and Narkiewicz: Is it true that every number field has a finite extension L such that the ring of integers of L is generated by its un...
Cox rings and pseudoeffective cones of projectivized toric vector bundles
Cox rings projectivized toric vector bundles
2010/12/13
We study projectivizations of a special class of toric vector bundles that includes cotangent bundles, whose associated Klyachko filtrations are particularly simple.
Equivariant total ring of fractions and factoriality of rings generated by semiinvariants
Equivariant total ring of fractions and factoriality of rings generated by semiinvariants
2010/12/13
Let F be an affine flat group scheme over a commutative ring R,and S an F-algebra (an R-algebra on which F acts). We define an equivariant analogue QF (S) of the total ring of fractions Q(S) of S.It i...
Skew polynomial rings, Groebner bases and the letterplace embedding of the free associative algebra
Skew polynomial rings Free algebras Gr¨obner bases
2010/12/9
In this paper we introduce an algebra embedding : KhXi → S from the free associative algebra KhXi generated by a finite or countable set X into the skew monoid ring S = P ∗ defined by the co...
Depth of edge rings arising from finite graphs
edge ring toric ideal finite graph Gr¨obner basis initial ideal
2010/12/1
Let G be a finite graph and K[G] the edge ring of G. Based on the technique of Gr¨obner bases and initial ideals, it will be proved that, given integers f and d with 7 f d, there exists a finite g...
We study those group rings whose group of units is hyperbolic.Let (X, ) be a metric space with metric . For any a, b, c ∈ X, the Gromov product hb, cia of b and c with respect to a ∈ X is defined as...
Cox rings of rational complexity one T-varieties
Cox ring branched coverings torus actions
2010/11/29
Let X be a Mori dream space together with an effective torus action of complexity one. In this note, we construct a polyhedral divisor DCox on a suitable finite covering of P1 which corresponds to the...
On Generalized Weil Representations over Involutive Rings
Weil representation generalized classical groups involutive analogues of classical groups
2010/11/30
We construct via generators and relations, generalized Weil representations for analogues
of classical SL(2, k), k a field, over involutive base rings (A, ∗). This family of groups
covers diff...
Derivations, generic formal fibers and bad Noetherian rings
Derivations generic formal fibers bad Noetherian rings
2010/12/9
We consider a circle of ideas involving differential algebra, local Noetherian rings, and their generic formal fibers. Connecting these ideas gives rise to what we term a “twisted” subring R of a ring...
We introduce the Andr´e-Quillen cohomology of -rings and -rings, this is different to the -ring cohomology defined by Yau in 2005. We show that there is a natural transformation connecting th...
Idempotents in representation rings of quivers
Idempotents representation rings of quivers
2010/11/26
For an acyclic quiver Q, we solve the Clebsch-Gordan problem for the projective representations by computing the mul-tiplicity of a given indecomposable projective in the tensor product of two indecom...
DESCENDENT INTEGRALS AND TAUTOLOGICAL RINGS OF MODULI SPACES OF CURVES
DESCENDENT INTEGRALS TAUTOLOGICAL RINGS MODULI SPACES CURVES
2018/4/19
The main objective of this paper is to give a summary of our recent work on recursion formulae for intersection numbers on moduli spaces of curves and their applications.We also present a conjectural ...
Fuzzy Maximal Ideals of Gamma Near-Rings
(normal) fuzzy ideal fuzzy maximal ideal complete normal fuzzy ideal
2010/3/1
Fuzzy maximal ideals and complete normal fuzzy ideals in G-near-rings are considered, and related properties are investigated.
From Endangered Fish to Saturn's Rings: NASA Science Highlighted at American Geophysical Union Meeting
Endangered Fish Saturn's Rings American Geophysical Union Meeting
2009/12/18
NASA researchers are presenting a wide range of science results at the 2009 fall meeting of the American Geophysical Union. The meeting opens Dec. 14 and continues through Friday, Dec. 18, at the Mosc...