Z$_3$-graded differential geometry of quantum plane

Deformation theory via differential graded Lie algebras

It is a basic introduction to differential graded Lie algebras, Maurer-Cartan equation and associated deformation functors.

Homological Algebra for Superalgebras of Differentiable Functions

This is the second in a series of papers laying the foundations for a differential graded approach to derived differential geometry (and other geometries in characteristic zero). In this paper, we extend the classical notion of a dg-algebra to define, in particular, the notion of a differential graded algebra in the world of C-infinity rings. The opposite of the category of differential graded C-infinity algebras contains the category of differential graded manifolds as a full subcategory. More generally, this notion of differential graded algebra makes sense for algebras over any (super) Ferm…

On The Formality Theorem for the Differential Graded Lie Algebra of Drinfeld

We discuss the differential graded Lie algebra (DGLA) of Drinfeld modeled on the tensor algebra of the universal enveloping algebra of a Lie algebra g over any field K of characteristic zero. We explicitly analyze the first obstruction to the existence of the formality quasi-isomorphism for this DGLA. Our analysis implies the formality of the DGLA of Drinfeld associated to the two-dimensional Borel algebra b.

Noncommutative Galois Extension and Graded q-Differential Algebra

We show that a semi-commutative Galois extension of a unital associative algebra can be endowed with the structure of a graded q-differential algebra. We study the first and higher order noncommutative differential calculus of semi-commutative Galois extension induced by the graded q-differential algebra. As an example we consider the quaternions which can be viewed as the semi-commutative Galois extension of complex numbers.

The differential graded odd nilHecke algebra

We equip the odd nilHecke algebra and its associated thick calculus category with digrammatically local differentials. The resulting differential graded Grothendieck groups are isomorphic to two different forms of the positive part of quantum sl(2) at a fourth root of unity.

Differential Graded Lie Algebras and Deformations of Holomorphic Maps

We construct the deformation functor associated to a couple of morphisms of differential graded Lie algebras, and use it to study the infinitesimal deformations of a holomorphic map of compact complex manifolds. In particular, in the case of Kähler manifolds we describe a generalizzation of the semiregularity map.

Tensor product of N-complexes and generalization of graded differential algebras

It is known that the notion of graded differential algebra coincides with the notion of monoid in the monoidal category of complexes. By using the monoidal structure introduced by M. Kapranov for the category of $N$-complexes we define the corresponding generalization of graded differential algebras as the monoids of this category. It turns out that this generalization coincides with the notion of graded $q$-differential algebra which has been previously introduced and studied.

Left covariant differential calculi on $\widetilde{\rm GL}_q(2)$

In this work, we introduce the ${\mathbb Z}_3$-graded differential algebra, denoted by $Ω(\widetilde{\rm GL}_q(2))$, treated as the ${\mathbb Z}_3$-graded quantum de Rham complex of ${\mathbb Z}_3$-graded quantum group $\widetilde{\rm GL}_q(2)$. In this sense, we construct left-covariant differential calculi on the ${\mathbb Z}_3$-graded quantum group $\widetilde{\rm GL}_q(2)$.

全局Koszul对偶：微分格式余代数与弯曲李代数

Global Koszul Duality: Differential Graded Cocommutative Coalgebras and Curved Lie Algebras

本文构建了非锥积的微分格式余代数的组合模型结构，并为特征为0的代数闭域上的弯曲李代数赋予∞-范畴结构，扩展了Harrison和Chevally-Eilenberg函子并证明其构成∞-范畴的等价。

Lectures on graded differential algebras and noncommutative geometry

These notes contain a survey of some aspects of the theory of graded differential algebras and of noncommutative differential calculi as well as of some applications connected with physics. They also give a description of several new developments.

Curved differential graded algebras and corings

A relationship between curved differential algebras and corings is established and explored. In particular it is shown that the category of semi-free curved differential graded algebras is equivalent to the category of corings with surjective counits. Under this equivalence, comodules over a coring correspond to integrable connections or quasi-cohesive curved modules, while contramodules over a coring correspond to a specific class of curved modules introduced and termed Z-divergences in here.

Deformation of infinite dimensional differential graded Lie algebras

We introduce a notion of elliptic differential graded Lie algebra. The class of elliptic algebras contains such examples as the algebra of differential forms with values in endomorphisms of a flat vector bundle over a compact manifold, etc. For elliptic differential graded algebra we construct a complete set of deformations. We show that for several deformation problems the existence of a formal power series solution guarantees the existence of an analytic solution.

微分分次顶点算子代数及其 Poisson 代数

Differential graded vertex operator algebras and their Poisson algebras

该研究定义微分分次顶点算子代数及其 Zhu 代数、$C_2$-代数结构，并建立相应模概念以刻画不同模范畴的关系。

On some $p$-differential graded link homologies

We show that the triply graded Khovanov-Rozansky homology of knots and links over a field of positive odd characteristic $p$ descends to an invariant in the homotopy category finite-dimensional $p$-complexes. A $p$-extended differential on the triply graded homology discovered by Cautis is compatible with the $p$-DG structure. As a consequence we get a categorification of the Jones polynomial evaluated at an odd prime root of unity

A differential graded Lie algebra approach to non abelian extensions of associative algebras

In this paper we show that non abelian extensions of an associative algebra $\mathcal{B}$ by an associative algebra $\mathcal{A}$ can be viewed as Maurer-Cartan elements of a suitable differential graded Lie algebra $L$. In particular we show that $\mathcal{MC}(L)$, the Deligne groupoid of $L$, is in 1-1 correspondence with the non-abelian cohomology $H^2_{nab}(\mathcal{B},\mathcal{A})$.

Differential equations and logarithmic intertwining operators for strongly graded vertex algebras

We derive certain systems of differential equations for matrix elements of products and iterates of logarithmic intertwining operators among strongly graded generalized modules for a strongly graded conformal vertex algebra under suitable assumptions. Using these systems of differential equations, we verify the convergence and extension property needed in the logarithmic tensor category theory for such strongly graded generalized modules developed by Huang, Lepowsky and Zhang.

Noncommutative Geometry in the Framework of Differential Graded Categories

In this survey article we discuss a framework of noncommutative geometry with differential graded categories as models for spaces. We outline a construction of the category of noncommutative spaces and also include a discussion on noncommutative motives. We propose a motivic measure with values in a motivic ring. This enables us to introduce certain zeta functions of noncommutative spaces.

非交换几何中两种微分格代数的比较

Comparison between two differential graded algebras in Noncommutative Geometry

本文比较了非交换几何中Connes和Fröhlich等人定义的两种微分格代数，发现Connes的dga在信息性上更具优势。

微分分次胞腔2-表示

Differential graded cell 2-representations

该研究针对微分分次2-范畴建立胞腔组合与胞腔2-表示理论，引入强弱两类预序并分析其性质，构造对应极大理想谱与微分分次胞腔2-表示，证明强弱胞腔的包含关系及谱的双射性，最终完成投射双模dg 2-范畴的胞腔2-表示分类。

Quantum projective planes as certain graded twisted tensor products

Let $\mathbb{k}$ be an algebraically closed field. Building upon previous work, we classify, up to isomorphism of graded algebras, quadratic graded twisted tensor products of $\mathbb{k}[x,y]$ and $\mathbb{k}[z]$. When such an algebra is Artin-Schelter regular, we identify its point scheme and type. We also describe which three-dimensional Sklyanin algebras contain a subalgebra isomorphic to a quantum $\mathbb{P}^1$, and we show that every algebra in this family is a graded twisted tensor product of $\mathbb{k}_{-1}[x,y]$ and $\mathbb{k}[z]$.

微分格拉斯曼代数的形性与复拉格朗日子流形

Formality of differential graded algebras and complex Lagrangian submanifolds

本文通过变形量子化证明了复拉格朗日子流形的端射影微分格拉斯曼代数的形性，并推广到拉格朗日子流形对的情况，同时研究了形性在A∞模块族中的行为。

Differential graded Lie algebras controlling infinitesimal deformations of coherent sheaves

We use the Thom-Whitney construction to show that infinitesimal deformations of a coherent sheaf F are controlled by the differential graded Lie algebra of global sections of an acyclic resolution of the sheaf End(E), where E is any locally free resolution of F. In particular, one recovers the well known fact that the tangent space to deformations of F is Ext^1(F,F), and obstructions are contained in Ext^2(F,F). The main tool is the identification of the deformation functor associated with the Thom-Whitney DGLA of a semicosimplicial DGLA whose cohomology is concentrated in nonnegative degrees …

Semi-Commutative Galois Extension and Reduced Quantum Plane

In this paper we show that a semi-commutative Galois extension of associative unital algebra by means of an element, whose Nth power is equal to the identity element of an algebra, where N is an integer greater or equal to two, induces a structure of graded q-differential algebra, where q is a primitive Nth root of unity. A graded q-differential algebra with differential d, whose Nth power is equal to zero, can be viewed as a generalization of graded differential algebra. The subalgebra of elements of degree zero and the subspace of elements of degree one of a graded q-differential algebra tog…

关于若干$p$-微分分次链环同调 II

On some $p$-differential graded link homologies II

本研究拓展了链环同调的范畴化工作，提出一族将Cautis微分特化为N=kp+2形式的链环同调，证明k为偶数时它们均范畴化2p次单位根处的琼斯多项式且互不同构，丰富了相关不变量体系。

Differential graded algebra over quotients of skew polynomial rings by normal elements

Differential graded algebra techniques have played a crucial role in the development of homological algebra, especially in the study of homological properties of commutative rings carried out by Serre, Tate, Gulliksen, Avramov, and others. In this article, we extend the construction of the Koszul complex and acyclic closure to a more general setting. As an application of our constructions, we shine some light on the structure of the Ext algebra of quotients of skew polynomial rings by ideals generated by normal elements. As a consequence, we give a presentation of the Ext algebra when the elem…

Differential Calculi over Quantum Groups and Twisted Cyclic Cocycles

We study some aspects of the theory of non-commutative differential calculi over complex algebras, especially over the Hopf algebras associated to compact quantum groups in the sense of S.L. Woronowicz. Our principal emphasis is on the theory of twisted graded traces and their associated twisted cyclic cocycles. One of our principal results is a new method of constructing differential calculi, using twisted graded traces.

微分格架范畴在全纯辛几何中的应用

Differential graded categories in holomorphic symplectic geometry

本文研究全纯辛流形的微分格架范畴及其变形量子化，探讨其形式性条件及Kaledin类对形式性的阻碍作用。

Disconnected rational homotopy theory

We construct two algebraic versions of homotopy theory of rational disconnected topological spaces, one based on differential graded commutative associative algebras and the other one on complete differential graded Lie algebras. As an application of the developed technology we obtain results on the structure of Maurer-Cartan spaces of complete differential graded Lie algebras.

右协变微分学 on ${\cal F}({\mathbb C}_q^{2|1})

Right-covariant differential calculus on ${\cal F}({\mathbb C}_q^{2|1})$

本文定义了一个新的${\mathbb Z}_2$-graded量子(2+1)空间，并展示其多项式代数是一个${\mathbb Z}_2$-graded Hopf代数，构建了右协变微分学，并讨论了相关的代数性质。

Some topics on the $Z_3$-graded exterior algebras

A $Z_3$-graded Hopf algebra structure of exterior algebra with two generators is introduced. Two covariant differential calculus on the $Z_3$-graded exterior algebra are presented. Using the generators and their partial derivatives a Grassmann-Heisenberg algebra is constructed. An R-matrix which satisfies graded Yang-Baxter equations is obtained. A $Z_3$-graded universal enveloping algebra $U_q(\widetilde{gl}(2))$ is constructed with the quadratic elements of the Grassmann-Weyl algebra.

Differential Graded Cohomology and Lie algebras of Holomorphic Vector Fields

The Dolbeault resolution of the sheaf of holomorphic vector fields $Lie$ on a complex manifold $M$ relates $Lie$ to a sheaf of differential graded Lie algebras, known as the Frölicher-Nijenhuis algebra $g$. We establish - following B. L. Feigin - an isomorphism between the differential graded cohomology of the space of global sections of $g$ and the hypercohomology of the sheaf of continuous cochain complexes of $Lie$. We calculate this cohomology up to the singular cohomology of some mapping space. We use and generalize results of N. Kawazumi on complex Gelfand-Fuks cohomology. Applications a…

Noncommutative epsilon-graded connections

We introduce the new notion of epsilon-graded associative algebras which takes its root into the notion of commutation factors introduced in the context of Lie algebras. We define and study the associated notion of epsilon-derivation-based differential calculus, which generalizes the derivation-based differential calculus on associative algebras. A corresponding notion of noncommutative connection is also defined. We illustrate these considerations with various examples of epsilon-graded algebras, in particular some graded matrix algebras and the Moyal algebra. This last example permits also t…

Locally finite infinity-modules and weak Loday-Pirashvili modules over differential graded Lie algebras

Motivated by recent developments of $\infty$-categorical theories related to differential graded (dg for short) Lie algebras, we develop a general framework for locally finite $\infty$-$\mathfrak{g}$-modules over a dg Lie algebra $\mathfrak{g}$. We show that the category of such locally finite $\infty$-$\mathfrak{g}$-modules is almost a model category in the sense of Vallette. As a homotopy theoretical generalization of Loday and Pirashvili's Lie algebra objects in the tensor category of linear maps, we further study weak Loday-Pirashvili modules consisting of $\infty$-morphisms from locally f…

Koszul duality and homotopy theory of curved Lie algebras

This paper introduces the category of marked curved Lie algebras with curved morphisms, equipping it with a closed model category structure. This model structure is---when working over an algebraically closed field of characteristic zero---Quillen equivalent to a model category of pseudo-compact unital commutative differential graded algebras; this extends known results regarding the Koszul duality of unital commutative differential graded algebras and differential graded Lie algebras. As an application of the theory developed within this paper, algebraic deformation theory is extended to func…

微分分次Verlinde公式与Deligne猜想

The differential graded Verlinde Formula and the Deligne Conjecture

本文研究模范畴产生的微分分次模函子，证明环面映射类群中特定元素$S$的作用可将微分分次Verlinde代数转化为Deligne猜想提供的$E_2$结构，并在半单与非半单情形下分别归结为Verlinde公式及其非半单推广。

微分分次顶点李代数

Differential graded vertex Lie algebras

本文将顶点李代数定义推广到微分分次（dg）框架，构造dg顶点李代数到dg顶点代数范畴的左伴随函子，提供大量实例并为顶点代数范畴同伦理论构建奠定基础。

Quadratic differential algebras generated by Euclidean spaces

We define a class of quadratic differential algebras which are generated as differential graded algebras by the elements of an Euclidean space. Such a differential algebra is a differential calculus over the quadratic algebra of its elements of differential degree zero. This generalizes for arbitrary quadratic algebras the differential graded algebra of exterior polynomial differential forms for the algebra of polynomial functions on $\mathbb R^n$. We investigate the structure of these differential algebras and their connection with the Koszul complexes of quadratic algebras.

Non-commutative Courant algebroids and Quiver algebras

In this paper, we develop a differential-graded symplectic (Batalin-Vilkovisky) version of the framework of Crawley-Boevey, Etingof and Ginzburg on noncommutative differential geometry based on double derivations to construct non-commutative analogues of the Courant algebroids introduced by Liu, Weinstein and Xu. Adapting geometric constructions of Ševera and Roytenberg for (commutative) graded symplectic supermanifolds, we express the BRST charge, given in our framework by a `homological double derivation', in terms of Van den Bergh's double Poisson algebras for graded bi-symplectic non-commu…