The coefficient functions of the hyperbolic equations considered are assumed to be piecewise constant.

我们假设在所考虑的微分方程中，系数函数为片段常函数。

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If the definition: "the plane's two fixed-point distance of the poor in absolute terms equal to the constant point of the track is hyperbolic."

如定义：“平面内到两个定点的距离的差的绝对值等于常数的点的轨迹是双曲线。”

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If the definition: "the plane's two fixed-point distance of the poor in absolute terms equal to the constant point of the track is hyperbolic."

如定义：“平面内到两个定点的距离的差的绝对值等于常数的点的轨迹是双曲线。”

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