AUTOMORPHISMS OF THE LIE-ALGEBRA OF UPPER-TRIANGULAR MATRICES OVER A CONNECTED COMMUTATIVE RING

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.