研究具有二阶可降阶微分约束的力学系统的形式不变性。
A form invariance for mechanical systems with second_order reducible differential constraints is studied.
证明了通过施加适当的微分约束，K p方程族的格拉姆行列式的解很自然的约化为BK p方程族的解。
It is shown that, by imposing proper differential constraint, the Grammian determinant type solutions of the KP hierarchy are naturally led to the PfafRan solutions of the BKP hierarchy.
来看一下这个约束量的微分。
Well, let's look at the differential — — of this constraint quantity.
应用推荐