  Let $\mathbb{K}=\mathbb{R}$ or $\mathbb{C}$, and $T_n(\mathbb{K})$ be the set
of $n\times n$ lower triangular matrices with entries in $\mathbb{K}$. We show
that $T_n(\mathbb{K})$ has dense subsemigroups that are generated by $n+1$
matrices.
