Sentence examples for an open problems from inspiring English sources

An open problems are also given at the end for further investigation.

It is an open problem.

The reverse implication is an open problem.

However, this is still an open problem.

We consider this as an open problem.

Finally, an open problem for future research.

We leave it as an open problem.

However, the general flexible case is still an open problem.

Robust mobile robot navigation is an open problem.

The criterion also allows an open problem by K.-H.

Silvey identified finding such an inverse as an open problem.