Sentence examples for solution was very difficult from inspiring English sources
Attempt has been made to use higher concentrations of rice, 16 g, but the resulting solution was very difficult of dissolve and therefore the experiment was discarded.
Analytical trajectories are therefore useful aids in a preliminary phase of mission design, even though exact solution are very difficult to obtain.
However, the respective differential equations are often stiff, complicated by non-linear equilibrium relations, and their numerical solution is very difficult.
In general, we note that the existence of Birkhoff type periodic solution is very difficult to prove, see, for example, Bernstein and Katok work [21].
In general, we note that the existence of Birkhoff type periodic solution is very difficult to prove, see, for example, Bernstein and Katok's work [3].
In multi-objective particle swarm optimization (MOPSO) algorithms, finding the global optimal particle (gBest) for each particle of the swarm from a set of non-dominated solutions is very difficult yet an important problem for attaining convergence and diversity of solutions.
But it was very difficult to come up with a better solution.
"The interrogation was very difficult.
"Our life was very difficult.
