 
Summary: \
1820 VIDAL COMMUNICATIONS IN ALGEBRA, 22(5), 18211832 (1994)
[LL] T. Y. LAM and A. LEROY. Vandermonde and Wronskian
Matrices over Division Rings, J. of Algebra 119 (1988),
308336.
GENERATORS AND RELATIONS OF INVARIANTS
Received: December 1992
OF 2 X 2 MATRICES
Revised: August 1993
Helmer Aslaksen, EngChye Tan and Chenbo Zhu
Department of Mathematics
National University of Singapore
Singapore 0511
Republic of Singapore
mathelmr(mattanec,matzhucb)~nusunix.nus.sg
1 Introduction'
Let G be a classical group of matrices of order n x n over F, where F is IR or
C. Let G act on mtuples of n x n matrices by simultaneous conjugation. In
[3,9, 11J systems of generators of the polynomial invariants were given. These
sets, however, contain infinitely many generators. When n = 2, it is possible
