Dz. Dokovic, AUTOMORPHISMS OF THE LIE-ALGEBRA OF UPPER-TRIANGULAR MATRICES OVER A CONNECTED COMMUTATIVE RING, Journal of algebra, 170(1), 1994, pp. 101-110
Let R be a non-trivial commutative ring having no idempotents except 0
and 1. Denote by t the Lie algebra over R consisting of all upper tri
angular n by n matrices over R. We give an explicit description of the
automorphism group of this Lie algebra. (C) 1994 Academic Press, Inc.