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1·The function is continuously differentiable.

函数是连续可微分的。

2·The value function turns out to be continuous in the whole plane, and is even continuously differentiable in the interiors of both right and left half planes.

说明了值函数在整个平面上是连续的，在左右两个半平面的内部还是连续可微的。

3·The traditional bi-level model formulation of these problems is transformed into a single-level continuously differentiable problem using a marginal function approach.

并提出了一种基于路段变量的连续可导的边际函数和距离函数，从而把两层规划转化成单层规划问题。