In this paper, we study the invariant theory of Viberg's Theta-groups in classical cases. For a classical Theta-group naturally contained in a general linear group, we show the restriction map, from the ring of invariants of the Lie algebra of the general linear group to that of the Theta-representation defined by the Theta-group, is surjective. As a consequence, we obtain explicitly algebraically independent generators of the ring of invariants of the Theta-representation. We also give a description of the Weyl groups of the classical Theta-groups.
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