Bibinur Duisengalieva, Ualbai Umirbaev
An example of a non-triangulable locally nilpotent derivation and an example of a wild exponential automorphism of the free Novikov algebra $N\left\langle x,y,z\right\rangle$ in three variables $x,y,z$ over a field of characteristic zero are constructed.
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We show that the right ideal of a Novikov algebra generated by the square of a right nilpotent subalgebra is nilpotent. We also prove that a $G$-graded Novikov algebra $N$ over a field $K$ with solvable $0$-component $N_0$ is solvable, where $G$ is a finite additive abelean group and the characteristic of $K$ does not divide the order of the group $G$. We also show that any Novikov algebra $N$ with a finite solvable group of automorphisms $G$ is solvable if the algebra of invariants $N^G$ is solvable.
An Anick type wild automorphism of free Poisson algebras
本文在 3 生成自由 Poisson 代数中构造 Anick 型野生自同构 $δ$，证明其在多项式代数上诱导驯顺自同构且本身稳定驯顺。
It is proved that the tame automorphism group of a differential polynomial algebra $k\{x,y\}$ over a field $k$ of characteristic $0$ in two variables $x,y$ with $m$ commuting derivations $δ_1, \ldots, δ_m$ is a free product with amalgamation. An example of a wild automorphism of the algebra $k\{x,y\}$ in the case of $m\geq 2$ derivations is constructed.
In 2004 Shestakov and Umirbaev proved that the Nagata automorphism of the polynomial algebra in three variables is wild. We fix a Z-grading on this algebra and consider graded-wild automorphisms, i.e. such automorphisms that can not be decomposed onto elementary automorphisms respecting the grading. We describe all gradings allowing graded-wild automorphisms.
Erroneous proofs of the wildness of some automorphisms of free metabelian Lie algebras
本文指出 Bahturin–Nabiyev 与 Özcurt–Ekici 关于自由亚阿贝尔李代数野性自同构的证明存在不可修正错误，强调秩 n≥4 情形的驯顺/野性问题仍未解决。
Transposed Poisson structure on the Witt-type algebra $\mathcal{W}(a,-1)$: Derivations, Automorphisms, and Rota--Baxter operators
分类了Witt型代数W(a,-1)上的导子、自同构和Rota-Baxter算子，证明了非平凡δ-导子仅存在于δ=1和1/2，并建立了刚性结果。
We study automorphisms of the free associative algebra K<x,y,z> over a field K which fix z and such that the images of x, y are linear with respect to x, y. We prove that some of these automorphisms are wild in the class of all automorphisms fixing z, including the well known automorphism discovered by Anick, and show how to recognize the wild ones. This class of automorphisms induces tame automorphisms of the polynomial algebra K[x,y,z]. For n>2 the automorphisms of K<x_1,...,x_n,z> which fix z and are linear in the x's are tame.
Algebras with the polynomial identity (x,y,z)=(x,z,y), where (x,y,z)=x(yz)-(xy)z is the associator, are called right-symmetric. Novikov algebras are right-symmetric algebras satisfying additionally the polynomial identity x(yz)=y(xz). We consider the d-generated free right-symmetric algebra F(R) and the free Novikov algebra F(N) over a filed K of characteristic 0. The general linear group GL(K,d) with its canonical action on the d-dimensional vector space with basis the generators of F(R) and F(N) acts on F(R) and F(N) as a group of linear automorphisms. For a subgroup G of GL(K,d) we study th…
Tangent Lie Algebras of Automorphism Groups of Free Algebras
本文为自由代数自同构群引入切李代数，证明其包含于常散度导子李代数，并利用该工具证明几乎所有已知野生自同构（除Nagata和Anick外）均为绝对野生，包括Bergman自同构及多数多项式幂零李代数簇中的自由代数。
Recently Umirbaev has proved the long-standing Anick conjecture, that is, there exist wild automorphisms of the free associative algebra K<x,y,z> over a field K of characteristic 0. In particular, the well-known Anick automorphism is wild. In this article we obtain a stronger result (the Strong Anick Conjecture that implies the Anick Conjecture). Namely, we prove that there exist wild coordinates of K<x,y,z>. In particular, the two nontrivial coordinates in the Anick automorphism are both wild. We establish a similar result for several large classes of automorphisms of K<x,y,z>. We also find a…
We construct an analogue of the Nagata automorphism of free nonassociative algebras and free commutative algebras of rank two over a Euclidean domain and prove that it is wild.
Chein Automorphisms of Free Metabelian Anticommutative Algebras
本文研究了自由双交换交换代数中只移动一个变量的Chein自同构，证明了当秩为2时自同构是线性的，并指出度数为3的Chein自同构在n≥3时具有绝对野性。
We prove that the group of tame automorphisms of a free Lie algebra (as well as of a free anticommutative algebra) rank 3 over an arbitrary integral domain has the structure of an amalgamated free product. We construct an example of a wild automorphism of a free Lie algebra (as well as of a free anticommutative algebra) of rank 3 over an arbitrary Euclidean ring analogous to the Anick automorphism for free associative algebras.
We prove that the well-known Anick automorphism of the free associative algebra F<x,y,z> over an arbitrary field F of characteristic 0 is wild.
Lie subalgebras of vector fields on curves
研究光滑仿射曲线上Krichever-Novikov代数的子代数结构，证明每个无限维子代数同构于另一个Krichever-Novikov代数的有限余维子代数，并给出通用包络代数非诺特性、Dixmier性质及Witt代数无限维子代数分类等应用。
A differential analogue of the wild automorphism conjecture
建立了代数动力学中Reichstein-Rogalski-Zhang猜想的微分类比：若射影簇X上存在整体代数向量场v使得(X,v)无真不变子簇，则X为阿贝尔簇；同时研究了阿贝尔簇上具有该性质的向量场。
We introduce the notion of a projectively simple ring, which is an infinite-dimensional graded k-algebra A such that every 2-sided ideal has finite codimension in A (over the base field k). Under some (relatively mild) additional assumptions on A, we reduce the problem of classifying such rings (in the sense explained in the paper) to the following geometric question, which we believe to be of independent interest. Let X is a smooth irreducible projective variety. An automorphism f: X -> X is called wild if it X has no proper f-invariant subvarieties. We conjecture that if X admits a wild auto…
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