Sentence examples for this problem has from inspiring English sources

This problem has been pondered before.

This problem has no right answer.

This problem has perplexed physicists for decades.

Rectifying this problem has proved impossible.

This problem has many dimensions.

This problem has parallels internationally.

This problem has been reported to SGI.

This problem has long been recognised.

This problem has been thoroughly solved.

This problem has not been previously addressed.

This problem has wide applications in practice.