New posts in Open Problems

Lower bounds (or less) for the period of sqrt(D) and related sequences

Birkhoff conjecture about integrable billiards

List of recently solved mathematical problems

Do there exist chess positions that require exponentially many moves to reach?

Does there exist a comprehensive compilation of Erdos's open problems?

Is Thompson's Group F amenable?

Ramsey multiplicity

Does pi contain 1000 consecutive zeroes (in base 10)?

If $2^x $and $3^x$ are integers, must $x$ be as well?

Does linearization of categories reflect isomorphism?