Fred Rohrer
The behaviour under coarsening functors of simple, entire, or reduced graded rings, of free graded modules over principal graded rings, of superfluous monomorphisms and of homological dimensions of graded modules, as well as adjoints of degree restriction functors, are investigated.
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We investigate scalar restriction, scalar extension, and scalar coextension functors for graded modules, including their interplay with coarsening functors, graded tensor products, and graded Hom functors. This leads to several characterisations of epimorphisms of graded rings.
Let $A$ be a commutative augmented ring and $I$ be its augmentation ideal. This paper shows that the sequence $\{I^n/I^{n+1}\}$ becomes stationary up to isomorphism. The result yields stability in the associated graded ring of $A$ along $I$.
Let $G$ be a group with identity $e$. Let $R$ be a $G$-graded commutative ring, $M$ a graded $R$-module and $A\subseteq h(R)$ a multiplicatively closed subset of $R$. In this paper, we introduce the concept of graded $A$-2-absorbing submodules of $M$ as a generalization of graded 2-absorbing submodules and graded $A$-prime submodules of $M.$ We investigate some properties of this class of graded submodules.
The main goal of this article is to introduce the concept of $EM-G-$graded rings. This concept is an extension of the notion of $EM-$rings. Let $G$ be a group and $R$ be a $G-$graded commutative ring. The $G-$gradation of $R$ can be extended to $R[x]$ by taking the components $(R[x])_σ=R_σ[x]$. We define $R$ to be $EM-G-$graded ring if every homogeneous zero divisor polynomial has an annihilating content. We provide examples of $EM-G-$graded rings that are not $EM-$rings and we prove some interesting results regarding these rings.
On graded u-nil clean rings
该文定义并研究分次 U-nil 洁净环，作为分次 nil-good 环的推广，并讨论其在矩阵环、分次群环及平凡环扩张中的性质转移。
On graded NR-clean rings
本文把 NR-clean 概念推广到分次环理论，定义分次 NR-clean 环，研究其性质、例子及在矩阵环、群环和平凡环扩张上的表现。
On monoid graded semihereditary rings
研究分级左赫瑞德和左半赫瑞德环的模块性质，提供分级自由、投射、注入和平坦模块的分级版本，包括巴尔准则和拉兹洛定理。
Let $R$ be a commutative $G$-graded ring with a nonzero unity. In this article, we introduce the concept of graded radically principal ideals. A graded ideal $I$ of $R$ is said to be graded radically principal if $Grad(I)=Grad(\langle c\rangle)$ for some homogeneous $c\in R$, where $Grad(I)$ is the graded radical of $I$. The graded ring $R$ is said to be graded radically principal if every graded ideal of $R$ is graded radically principal. We study graded radically principal rings. We prove an analogue of the Cohen theorem, in the graded case, precisely, a graded ring is graded radically princ…
A characterization of monoid graded semihereditary rings
研究了格子左半赫瑞迪环的特征，证明了格子左合意性和所有平坦左模子模的平坦性是充要条件，从而给出了格子普鲁弗域的新特征。
Let R be a graded ring and n > 1 an integer. In this paper, We introduce the notions of Ding n-gr-injective and Ding n-gr-flat modules by using of special finitely presented graded modules . Then, some properties of Ding n-gr-injective and Ding n-gr-flat modules are obtained. On n-gr-coherent rings, we investigate the relationships among Ding n-gr-injective and Ding n-gr-flat modules and also, we prove that any graded module in R-gr (resp. gr-R) admits an Ding n-gr-injective (resp. Ding n-gr-flat) cover and preenvelope.
Let $R$ be a $G$-graded ring. In this article, we introduce two new concepts on graded rings, namely, weakly graded rings and invertible graded rings, and we discuss the relations between these concepts and several properties of graded rings. Also, we study the concept of weakly crossed products and study some properties defined on weakly crossed product and give the relationship between this new concept and several properties of graded rings. Moreover, in this article, we give a generalization for the concept of graded essential submodules, and introduce the concept of graded semi-uniform mod…
Graded differential polynomial rings
研究分次环上的微分多项式环何时具有相容分次，并建立其分次版本的简单性、素性和Noether性定理。
Let $G$ be a group with identity $e$. Let $R$ be a $G$-graded commutative ring and $M$ a graded $R$-module. In this paper, we introduce the concept of graded classical and graded strongly classical 2-absorbing second submodules of graded modules over a graded commutative rings. A number of results concerning these classes of graded submodules and their homogeneous components are given.
Ideals whose associated graded rings are isomorphic to the base rings
设$k$为字段。确定了一个生成的分次$k$ -代数$A$中的理想$I$，其伴随的分次环同构于$A$ .计算了Rees环$A[I t]$的分次局部上同调，并给出了$A[I t]$是广义Cohen-Macaulay环的条件.
This paper deals with the graded commutative rings in which every homogeneous prime ideal is contained in a unique homogeneous maximal ideal called Gelfand graded ring. The purpose is to establish some topological and algebraic characterizations of these rings, one of which is the algebraic analogue of the Urysohn's lemma. Finally we look at a special class of those graded rings called pm$^+$ graded rings which can be viewed as graded ring with a Gelfand strong property.
Let $G$ be a group with identity $e$. Let $R$ be a $G$-graded commutative ring and $M$ a graded $R$-module. In this paper, we introduce the concept of graded primary-like submodules as a new generalization of graded primary ideals and give some basic results about graded primary-like submodules of graded modules. Special attention has been paid, when graded submodules satisfies the gr-primeful property, to find extra properties of these graded submodules.
Regular $\mathbb{Z}$-graded local rings and Graded Isolated Singularities
本文研究正则Z-分次局部环的刻画，并用非交换射影概形的整体维数刻画分次孤立奇点，得到其与光滑性及凝聚层范畴有限整体维数的等价条件。
Comparing generalized Gorenstein properties in semi-standard graded rings
本文研究半标准分次环这一标准分次环的推广对象，比较其中的广义Gorenstein性质，分析两类分次环的共通性并揭示半标准分次环独有的特性。
Almost Gorenstein standard graded rings and their localizations
本文证明了域上Cohen-Macaulay标准分次整环为几乎Gorenstein分次环，等价于其在分次极大理想处局部化的完备化为几乎Gorenstein局部环。
Hyperplane sections of non-standard graded rings
本文提出了一种将标准分级环上的伯特尼型定理推广到非标准分级环的方法。
The article proved the upper bound of leading coefficient of characteristic polynomial of graded ideal in a ring of generalized polynomials.
Let $R$ be a $G$-graded ring and M be a $G$-graded $R$-module. We define the graded primary spectrum of $M$, denoted by $\mathcal{PS}_G(M)$, to be the set of all graded primary submodules $Q$ of M such that $(Gr_M(Q):_R M)=Gr((Q:_R M))$. In this paper, we define a topology on $\mathcal{PS}_G(M)$ having the Zariski topology on the graded prime spectrum $Spec_G(M)$ as a subspace topology, and investigate several topological properties of this topological space.
In this paper, we study the structure of the graded ring associated to a limit key polynomial $Q_n$ in terms of the key polynomials that define $Q_n$. In order to do that, we use direct limits. In general, we describe the direct limit of a family of graded rings associated to a totally ordered set of valuations. As an example, we describe the graded ring associated to a valuation-algebraic valuation as a direct limit of graded rings associated to residue-transcendental valuations.
In this paper, we will consider derived equivalences for differential graded endomorphism algebras by Keller's approaches. First we construct derived equivalences of differential graded algebras which are endomorphism algebras of the objects from a triangle in the homotopy category of differential graded algebras. We also obtain derived equivalences of differential graded endomorphism algebras from a standard derived equivalence of finite dimensional algebras. Moreover, under some conditions, the cohomology rings of these differential graded endomorphism algebras are also derived equivalent. T…
Matijevic-Roberts type theorems, Rees rings and associated graded rings
本文研究交换代数中提升问题、沿相伴分次环的上升/下降问题与Matijevic-Roberts型问题这三个显著问题之间的相互关联结构。
We prove necessary and sufficient conditions for the existence of homogeneous prime elements in normal N-graded rings of dimension two, in terms of rational coefficient Weil divisors on projective curves.
In this article, we show that the depths of the associated graded ring and fiber cone of a lex-segment ideal in $K[x,y]$ are equal.
Let $G$ be a group with identity $e$. Let $R$ be a $G$-graded commutative ring with identity and $M$ a graded $R$-module. In this paper, we introduce the concept of graded $I_{e}$-prime submodule as a generalization of a graded prime submodule for $I=\oplus_{g\in G}I_{g}$ a fixed graded ideal of $R$. We give a number of results concerning of these classes of graded submodules and their homogeneous components. A proper graded submodule $N$ of $M$ is said to be a graded $I_{e}$-prime submodule of $M$ if whenever $% r_{g}\in h(R)$ and $m_{h}\in h(M)$ with $r_{g}m_{h}\in N-I_{e}N,$ then either $r_…
We give suffcient conditions for a standard graded Cohen-Macaulay ring, or equivalently, an arithmetically Cohen-Macaulay projective variety, to be Cohen-Macaulay wild in the sense of representation theory. In particular, these conditions are applied to hypersurfaces and complete intersections.
In this article, we give the explicit minimal free resolution of the associated graded ring of certain affine monomial curves in affine 4-space based on the standard basis theory. As a result, we give the minimal graded free resolution and compute the Hilbert function of the tangent cone of these families.
Lance Bryant noticed in his thesis that there was a flaw in our paper "Associated graded rings of one-dimensional analytically irreducible rings", J. Algebra 304 (2006), 349-358. It can be fixed by adding a condition, called the BF condition. We discuss some equivalent conditions, and show that they are fulfilled for some classes of rings, in particular for our motivating example of semigroup rings. Furthermore we discuss the connection to a similar result, stated in more generality, by Cortadella-Zarzuela. Finally we use our result to conclude when a semigroup ring in embedding dimension at m…
Graded perfectoid rings
本文提出分级完美环的概念，建立了其与分级完美棱镜的范畴等价性，并证明了分级版本的André平坦性引理，为分级完美环理论奠定了基础。
The Koszul Property for Truncations of Nonstandard Graded Polynomial Rings
本文证明非标准分次多项式环的截断是Herzog-Iyengar意义下的非标准Koszul模，从而将标准分次情形下截断具有线性消解的结论推广到非标准分次框架。
In this paper, we give the necessary and sufficient conditions for the Cohen-Macaulayness of the associated graded ring of a simplicial affine semigroups using Gröbner basis. We generalize the concept of homogeneous numerical semigroup for the simplicial affine semigroup and show that the Betti numbers of the corresponding semigroup ring matches with the Betti numbers of the associated graded ring. We also define the nice extension for simplicial affine semigroups, motivated by the notion of a nice extension of the numerical semigroups.
$\mathbb{Z}^r$-graded rings and their canonical modules
本研究将分次典范模的定义推广到多分次环，证明其局部化性质，发展多分次环与模的基础理论，并给出仿射正规幺半群环典范模相关定理的除子式证明。
Cox rings of normal varieties are factorially graded, i.e. homogeneous elements allow a unique decomposition into homogeneous factors. We study this property from an algebraic point of view and give a criterion which in a sense reduces it to factoriality. This will allow us to detect and construct Cox rings in a purely algebraic manner.
Depth of associated graded rings via Hilbert coefficients of ideals
给定一个局部Cohen-Macaulay环$(R, {\mathfrak m})$，我们研究了${\mathfrak m}$ -准$R$ -理想$I$的积分闭性--甚至正规性--与$I$的Hilbert系数的条件之间的相互作用.我们将这些性质与$I$的相关分次环的深度联系起来。
Bounds on the Castelnuovo-Mumford regularity of the associated graded modules of k-Buchsbaum modules M are given in terms of k and some other invariants of M.
We define what it means for a Cohen-Macaulay ring to to be super-stretched and show that Cohen-Macaulay rings of graded countable Cohen-Macaulay type are super-stretched. We use this result to show that rings of graded countable Cohen-Macaulay type, and positive dimension, have possible h-vectors (1), (1,n), or (1,n,1). Further, one dimensional standard graded Gorenstein rings of graded countable type are shown to be hypersurfaces; this result is not known in higher dimensions. In the non-Gorenstein case, rings of graded countable Cohen-Macaulay type of dimension larger than 2 are shown to be …
In this paper we show a partial answer the a question of C. Huneke and G. Leuschke (2003): Let R be a standard graded Cohen-Macaulay ring of graded countable Cohen-Macaulay representation type, and assume that R has an isolated singularity. Is R then necessarily of graded finite Cohen-Macaulay representation type? In particular, this question has an affirmative answer for standard graded non-Gorenstein rings as well as for standard graded Gorenstein rings of minimal multiplicity. Along the way, we obtain a partial classification of graded Cohen-Macaulay rings of graded countable Cohen-Macaulay…
In 2012, Ananthnarayan, Avramov and Moore gave a new construction of Gorenstein rings from two Gorenstein local rings, called their connected sum. In this article, we investigate conditions on the associated graded ring of a Gorenstein Artin local ring Q, which force it to be a connected sum over its residue field. In particular, we recover some results regarding short, and stretched, Gorenstein Artin rings. Finally, using these decompositions, we obtain results about the rationality of the Poincare series of Q.
Graded rings associated with contracted ideals
通过定义，二维正则局部环$(R, \m)$中的$\m$ -准素理想$I$是收缩的，如果对于某个$x \in \m \setminus \m^2$，$I=R \cap IR[\m/x]$.收缩理想是由Zenki引入的，并用于证明完备（即整闭）理想的唯一因子分解定理。任何完全的理想都是收缩的，但不是相反。虽然与完备理想相关的分次环总是Cohen-Macaulay，但对于收缩理想却不是这样。我们的目标是研究齐次收缩理想的分次环的深度、Hilbert函数和定义方程。我们表明，通过使用二次变换，深度的相关分次环的收缩理想$I$是由深度的相关分次环的某个家庭的单项理想（实际上lex-segments），这是自然附着到$I$。对于某些类的压缩理想，我们证明了相关的分次环是Cohen-Macaulay或至少有正深度。
We introduce a notion of degenerations of graded modules. In relation to it, we also introduce several partial orders as graded analogies of the hom order, the degeneration order and the extension order. We prove that these orders are identical on the graded Cohen-Macaulay modules if a graded ring is of graded finite representation type and representation directed.
Let $(A,\mathfrak{m})$ be a Noetherian local ring of dimension $d>0$ and $I$ an $\mathcal{I}$-primary ideal of $A$. In this paper, we discuss a sufficient condition, for the Buchsbaumness of the local ring $A$ to be passed onto the associated graded ring of filtration. Let $\mathcal{I}$ denote an $I$-good filtration. We prove that if $A$ is Buchsbaum and the I-invariant, $I(A)$ and $I(G(\mathcal{I}))$, coincide then the associated graded ring $G(\mathcal{I})$ is Buchsbaum. As an application of our result, we indicate an alternative proof of a conjecture, of Corso on certain boundary conditions…
Sally modules and associated graded rings
利用附加在理想I上的数值数据，研究了m-准素理想I的伴随分次环的深度性质。利用I的Sally模S_J（I）关于I的极小约化J，我们还找到了I的Hilbert系数的界。
Normal ideals of graded rings
对于任意域$k$上的分次域$R=k[X_0,...,X_m]/J$，证明了由度元素$\geq mA$生成的理想是正规理想，其中$A$是$X_i$的权的最小公倍数.
On the computation of graded components of Laurent polynomial rings
本文给出了Laurent多项式环分次分支的几个算法。更精确地说，令$S$为特征为0的Laurent多项式环$k[x_1,...,x_{r},x_{r+1}^{\pm 1},..., x_n^{\pm 1}]$，$k$代数闭域。我们定义了$S$的多重分次是由一个任意的生成阿贝尔群$A$生成的.我们构造了一组与多重分次相容的扇形，并使用这些扇形来计算$S$的分次分量。我们给出了一个算法来检验$S$的分次分支是否是有限维的。无论维度如何，我们确定每个分次分量的生成元的有限集作为次数为0的齐次多项式的分量上的模块。
Let (R, m) be the semigroup ring associated to a numerical semigroup S. In this paper we study the property of its associated graded ring G(m) to be Complete Intersection. In particular, we introduce and characterise beta-rectangular and gamma-rectangular Apéry sets, which will be the fundamental concepts of the paper and will provide, respectively, a sufficient condition and a characterisation for G(m) to be Complete Intersection. Then we use these notions to give four equivalent conditions for G(m) in order to be Complete Intersection.
Homogeneity of zero-divisors, units and idempotents in a graded ring
本文受Kaplansky猜想启发，证明了分级环（尤其是monoid-rings）的若干重要结果，将群环 $K[G]$ 的Kaplansky零因子猜想推广至无挠群 $G$ 的 $G$-分级环情形。
Steenrod problem and some graded Stanley-Reisner rings
本文针对Steenrod提出的环的空间奇异上同调表示问题，研究分次Stanley-Reisner环的可实现性，在一定假设下给出了其可实现的充要条件。
We give bounds on the Castelnuovo-Mumford regularity of the associated graded module of an arbitrary good filtration and of its fiber cone. These bounds extend previous results of Rossi-Trung-Valla and Linh.
Let $\Bbb Z_2:=\Bbb Z/2\Bbb Z$ be the additive group with two elements. In this article, we focus only on $\Bbb Z_2$-graded commutative ring i.e commutative ring $R$ such that $R=R_0\oplus R_1$ as Abelian group and $R_iR_j\subseteq R_{i+j}$ for all $i,j\in \Bbb Z_2$. Our main goals is to establish a strong relation between $\Bbb Z_2$-graded prime ( maximal ) ideals of $R$ and prime ( maximal) ideals of $R_0$, for instance, it is showed that, the $\Bbb Z_2$-graded spectrum of $R$ is homeomorphic to the spectrum of $R_0$ with respect to the Zariski topologies.
Mixed Multiplicities of Multi-Graded Algebras Over Noetherian Local Rings
设S是Noether局部局部环A上的标准分次代数.本文首先用Hilbert-Samuel重数来表示S的混合重数，将S的混合重数解释为S的商模的Hilbert-Samuel重数。作为应用，我们得到了理想的混合重数的公式，涵盖了Trung-Verma 2007 [TV]的主要结果。
Let $R$ be a $G$ graded commutative ring and $M$ be a $G$-graded $R$-module. The set of all graded second submodules of $M$ is denoted by $Spec_G^s(M)$ and it is called the graded second spectrum of $M$. In this paper, we discuss graded rings with Noetherian graded prime spectrum and obtain some conclusions. In addition, we introduce the notion of the graded Zariski socle of graded submodules and explore their properties. Using these conclusions and properties, we also investigate $Spec_G^s(M)$ with the Zariski topology from the viewpoint of being a Noetherian space and give some related outco…
On Frobenius Betti numbers of graded rings of finite Cohen-Macaulay type
针对环的Frobenius Betti数显式计算场景极少的问题，本文聚焦于有限Cohen-Macaulay型Cohen-Macaulay分次环，开展其Frobenius Betti数的显式计算研究，拓展该奇异性不变量的计算范围。
Hilbert functions of graded algebras over Artinian rings
本文给出了Artin等特征局部环上标准代数的Hilbert函数和多项式的一个有效刻画，并研究了这类代数的上同调性质.我们描述的算法来检查一个给定的函数或多项式作为希尔伯特函数或多项式的容许性，并产生一个标准的代数与给定的希尔伯特函数。
We initiate the theory of graded commutative 2-rings, a categorification of graded commutative rings. The goal is to provide a systematic generalization of Paul Balmer's comparison maps between the spectrum of tensor-triangulated categories and the Zariski spectra of their central rings. By applying our constructions, we compute the spectrum of the derived category of perfect complexes over any graded commutative ring, and we associate to every scheme with an ample family of line bundles an embedding into the spectrum of an associated graded commutative 2-ring.
It is known that graded cyclic modules over $S=K[x,y]$ have the Weak Lefschetz Property (WLP). This is not true for non-cyclic modules over $S$. The purpose of this note is to study which conditions on $S$-modules ensure the WLP. We give an algorithm to test the WLP for graded modules with fixed Hilbert function. In particular, we prove that indecomposable graded modules over $S$ with the Hilbert function $(h_0,h_1)$ have the WLP.
Conditions of multiplicity and applications for almost Gorenstein graded rings
本文证明了在重数和Cohen-Macaulay型条件下，几乎Gorenstein性质可推出Gorenstein性质，并应用于张量积及仿射半群环类。
Betti numbers for connected sums of graded Gorenstein artinian algebras
本文确定了分次阿廷Gorenstein代数连通和的分次Betti数，并证明加倍代数的连通和等价于纤维积环的加倍，从而将连通和构造与加倍构造联系起来。
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