AUTOMORPHISMS OF 2-DIMENSIONAL LINEAR GROUPS OVER SEMI-LOCAL RINGS

Automorphisms of 2-dimensional linear groups over the skew-field (or field)have already been given by Hua Lnogeng and Wan Zhixian. Reiner, Landin, Dull et al. have made researches on the automorphisms of the 2-dimensional linear groups over some Euclidean rings and general integral domains. Not long ago, Wang Renfa worked out the automorphisms of 2-dimensional linear groups over local rings. On this basis, we tried to give the automor-