2 papers
math.RT2016
Multiplicity free gradings on semisimple Lie and Jordan algebras and skew root
Gang Han, Kang Lu, Yucheng Liu
A -grading on an algebra is called multiplicity free if each homogeneous component of the grading is 1-dimensional, where is an abelian group. We introduce skew root systems…
math.GR2014
Fine gradings of complex simple Lie algebras and Finite Root Systems
Gang Han, Kang Lu, Jun Yu
A -grading on a complex semisimple Lie algebra , where is a finite abelian group, is called quasi-good if each homogeneous component is 1-dimensional and 0 is not in the…