双曲型微分方程 meaning in English

hyperbolic differential equation

The cauchy problem for a hyperbolic equation of second order
关于一类二阶双曲型微分方程的柯西问题
Necessary and sufficient conditions for oscillation of solutions of delay hyperbolic differential equation
时滞双曲型微分方程解的振动充要条件
The cauchy problem for a hyperbolic equation of second order equation with data on the parabolic line
取值在抛物线上的双曲型微分方程的柯西问题