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.
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。
Well, let's look at the differential — — of this constraint quantity.
来看一下这个约束量的微分。
In the second part, we discuss the time-optimal control problem for an ordinary differential system with a pointwise state-constraint. We give the explicit solution.
第二部分讨论一个带有逐点状态约束的四阶常微分系统的时间最优控制问题，给出了显式解。
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