descent n. 1.下降,降下。 2.下坡,傾斜。 3.家世,門第,血統(tǒng)。 4.【法律】繼承,世襲。 5.一代;〔古語〕子孫,后裔。 6.突然襲擊。 7.屈尊,降格。 be of France descent 祖籍是法國。 be of good descent 出身好。 descent of man 人類由來。 make a descent upon 襲擊,侵入。
In mathematics, the method of steepest descent or stationary phase method or saddle-point method is an extension of Laplace's method for approximating an integral, where one deforms a contour integral in the complex plane to pass near a stationary point (saddle point), in roughly the direction of steepest descent or stationary phase. The saddle-point approximation is used with integrals in the complex plane, whereas Laplace’s method is used with real integrals.