Sentence examples for problem exist from inspiring English sources

IF criminal legal proceedings seem to turn out differently for people of different races, when does a constitutional problem exist?

Several variants of the transitive closure problem exist [8].

Several methods trying to tackle the phase noise problem exist.

Other, topological as opposed to measure-theoretic, approaches to this problem exist as well.

Different methods for solving the optimal control problem exist in the open literature.

Solutions to the problem exist if and only if the operator S has fixed points.

Clearly, a problem exists.

"Well, the problem exists".

A new problem exists.

A problem existed though.

Well, that problem exists no more.