单词 Prohessian 释义 Prohessian Math.|prhsn|[f. pro-1 4 + Hessian n.2](See quots.)1862Salmon Geom. Three Dimensions xii. 338 The Hessian of any surface being of the degree 4n–8, that of a developable consists of the surface itself, and a surface of 3n–...