open problem

1. A problem that has been posed in a field of study such as mathematics or theoretical computer science, but whose answer is not yet known.

1. Tom was open about his problems.

   CC BY · Tatoeba · Source_VOA · A2Open on TatoebaReport a problem

2. Mary was open about her problems.

   CC BY · Tatoeba · CF · A2Open on TatoebaReport a problem

3. He was open about his problems.

   CC BY · Tatoeba · CH · A1Open on TatoebaReport a problem

4. She was open about her problems.

   CC BY · Tatoeba · CH · A1Open on TatoebaReport a problem

regular