A geometrical approach to Gordan--Noether's and Franchetta's contributions to a question posed by Hesse
英文摘要：
Hesse claimed that an irreducible projective hypersurface in $\PP^n$ defined by an equation with vanishing hessian determinant is necessarily a cone. Gordan and Noether proved that this is true for $n\leq 3$ and constructed counterexamples for every $n\geq 4$. Gordan and Noether and Franchetta gave classification of hypersurfaces in $\PP^4$ with vanishing hessian and which are not cones. Here we translate in geometric terms Gordan and Noether approach, providing direct geometrical proofs of these results.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
