Sentence examples for problem is difficult to find from inspiring English sources

A computational solution for this problem is difficult to find [22].

Road safety standards also are poor; the accident rate is high; and, because of Nigeria's chronic economic problems, it is difficult to find spare parts to repair motor vehicles.

However, in multi objective problems, it is difficult to find a single solution which optimizes all objective functions, simultaneously.

The efficiency of the implicit method proposed by He (1999) depends on the parameter heavily; while it varies for individual problem, that is, different problem has different "suitable" parameter, which is difficult to find.

Since the optimization problem (20) is non-convex, it is difficult to find the analytical form of dist p (x S ) and thus the q-optimal spring potential.

The problem is, in part, linguistic, as it is difficult to find reasonably precise terms for that which is leisure and nonleisure.

The singleton attractor for N1 is difficult to find for this problem, because the control set must satisfy the inequality (2) (not damaging the normal cell substantially).

It is difficult to find an exact solution for problem (1) in our numerical experiment.

In general, it is difficult to find the optimal solution for Problem P11 directly.

However, the optimal search direction x∗ is difficult to find due to the nonconvex nature of the problem.

In general, it is difficult to find a closed-form solution to the constrained non-linear minimization problem in (22).