First Fundamental Theorem of Invariant Theory for covariants of classical groups

D. A. Shmel'kin

Let $U(G)$ be a maximal unipotent subgroup of one of classical groups $G=GL(V),O(V),Sp(V)$. Let $W$ be a direct sum of copies of $V$ and its dual $V\ast$. For the natural action $U(G)…