3 papers
math.QA2025
New presentation of the twisted Yangian of type
Shuichi Harako, Mamoru Ueda
We construct a new presentation of the twisted Yangian of type with a finite number of generators. By using this presentation, we propose a new definition of the twisted affine…
math.AT2022
Almost Commutative Manifolds and Their Modular Classes
Shuichi Harako
An almost commutative algebra, or a -commutative algebra, is an algebra which is graded by an abelian group and whose commutativity is controlled by a function called a commutat…
math.AT2020
The second homology group of the commutative case of Kontsevich's symplectic derivation Lie algebra
Shuichi Harako
The symplectic derivation Lie algebras defined by Kontsevich are related to various geometric objects including moduli spaces of graphs and of Riemann surfaces, graph homologies, H…