1 problem

Let $\repM_1,\repM_2,\dots,\repM_m$ be families of modules over $\eptl_N(\beta)$, with $m\geqslant 2$, and let $\widehat N_i=\sum_{k=1}^iN_k$. For vectors $u_i\in\repM_i(N_i)$, wri…