Let G be an infinite group. If G has a normal elementary abelian subgroup, then G is irrecognizable.

设G是无限群,若G存在正规初等交换子群,则G是不.

Using the notion of coefficient matrix and maximal element.We prove that the Lie algebra is semi-simple and it has no abelian two dimensional subalgebra.

数矩阵和极大项，证明了这类李代数是半单李代数且没有二维交换子代数。