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

设G无,G存在正规初等交换子,则G不可分辨.

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.

利用系矩阵和极大项，证明了这类李半单李且没有二维交换子。