The existence of such an example was an open problem for many years.

It is common in graduate schools to point out open problems to students.

However, there has been no progress on the name issue which remains an open problem.

Open problems in the study of these maps still remain.

Though they have been studied for more than a hundred years, many open problems remain.

It is an open problem as to whether such constructions are possible.

There, he was the first put forth the question of what shapes are possible as an open problem.

If this is an optimal construction remains an open problem.

In fact, each of the following is an open problem:

There are still many open problems in this area.

The exact value of the sofa constant is an open problem.

A viable general solution to such predictions remains an open problem.

Finding all such fields is a major open problem, particularly in the quadratic case.

For a while, it remained an open problem how many elements an essential component must have.

For most mathematical systems this remains an open problem.

The existence of a local data structure for this problem is an open problem.

The generation of excess energy by controlled fusion is still an open problem.

Soap film regularity of her solution remains an open problem.

In mathematics, the theory of Latin squares is an active research area with many open problems.

Envy-free division for 4 or more players was a difficult open problem of the twentieth century.

It is conjectured that on the word growth exist, but even this remains a major open problem.

It is an open problem to bridge this gap.

Miller made numerous contributions in the area of special functions and addressed several significant open problems.

Here are some open problems in the area.

Determining the capacity of the deletion channel is an open problem.