problem on obstacle

• 障碍问题

problem on obstacle的用法和样例：

例句

1. Moreover, when the matrix involved in the two-sided obstacle problem is a symmetric and nondegenerate matrix, the sequence converges to a solution of the problem.
   并且，当矩阵为非退化对称矩阵时，该序列收敛到双边障碍问题的解。