It is very important to study the structure of solution set especially when the solution of the initial value problem of equations is not a single one.
特别当方程的初值问题的解不唯一时，研究解集的结构具有重要的意义。
It is very important to study the structure of solution set especially when the solution of the initial value problem of equations is not a single one.
特别当方程的初值问题的解不唯一时，研究解集的结构具有重要的意义。
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