Root-graded Lie algebras with compatible grading
Lie algebras graded by a finite irreducible reduced root system R will
be generalized to predivision
(R, G)-graded Lie algebras
for an abelian group G.
In this paper such algebras are classified,
up to central extensions, when
R =Al for l>2,
D or E, and G=Zn.
(To appear in Communications in Algebra)
Y. Yoshii <yyoshii@uottawa.ca>