incompressible-fluid-equations
《incompressible-fluid-equations》 · 第 25 页 · Example 2.11「The Segre Maps」
Another fundamental family of maps are the Segre maps $\sigma:\mathbb P^n\times\mathbb P^m\to\mathbb P^{(n+1)(m+1)-1}$ defined by sending a pair $([X],[Y])$ to the point in $\mathbb P^{(n+1)(m+1)-1}$ whose coordinates are the pairwise products of the coordinates of $[X]$ and $[Y]$.