It hasI have found thea statement (such that HarrisHarris "Algebraic Geometry" 269, p.269) said thatsaying that a hypersurface onin $\mathbb{P}^m\times\mathbb{P}^n$ can be written as a single equation. I couldn't find the proof. How can I prove it? Is there good reference for the statement.
How can I prove it? Is there a good reference for the statement?