Sentence examples for been difficult to solve from inspiring English sources

This problem has been difficult to solve until the recent advances in sequencing technology.

The molecular phylogeny of NP has been difficult to solve because of population-level phenomena at the early evolution of the lineage.

The challenges we faced in our pilot project are difficult to solve.

Yet Ms. Romandetto told the parents that it was difficult to solve any one school's problem in a vacuum because she was looking at the districtwide picture.

It is difficult to solve in practice.

They are difficult to solve exactly.

The last problem seems to be difficult to solve analytically.

Hard to define problems are difficult to solve and verify.

However, it is difficult to solve the fractional differential equations.

The problem is difficult to solve for the traditional cryptography.

Note that it is difficult to solve (9) directly.