We describe Mùi invariants in terms of Milnor operations and
give a simple proof for Mùi's theorem
on rings of invariants of polynomial tensor exterior algebras
with respect to the action of finite
general linear groups. Moreover, we compute some rings of
invariants of Weyl groups of maximal non-toral elementary
abelian p–subgroups of exceptional Lie groups.
Keywords
invariant theory, Steenrod algebra,
cohomology, classifying space, Lie group