为什么这么多的作家当中只有屈指可数的几位在法国之外为人所知？

And why are so few of these authors known outside France?

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在积分常数为零的条件下，证明了该方程存在光滑孤立波解、不可数无穷多光滑周期波解、扭结波和反扭结波解。

When the integral constant is zero, the existence of smooth solitary wave solutions, uncountably infinite, many smooth periodic wave solutions, and kink and anti-kink wave solutions are proved.

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