| 释义 |
Prohessian Math.|prəʊˈhɛsɪən|
[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–8 degree which we shall call the Pro-Hessian. Ibid. xv. 426. 1864 Cayley Coll. Math. Papers V. 267 The function PU, which for the developable replaces as it were the Hessian HU, is termed the Prohessian; and (since if r be the order of U the order of HU is 4r–8) we have 3r–8 for the order of the Prohessian. |