The Riemann Conjecture, a topic that Master Grandfather hadn't wanted to touch before. This probably explains its difficulty, but at the same time, it's quite interesting.
Of course, neither Director Tian nor Master Grandfather across the table was actually that strict.
At least they didn't require him to prove the Riemann Conjecture within a certain time frame.
But then again, even to address those preliminary propositions is not that simple.
Otherwise, it wouldn't have become a series of conjectures. Oh right, Director Tian also mentioned needing a new perspective.
Actually, when wanting to study prime numbers, Qiao Yu had already roughly understood the Riemann Conjecture. Of course, this also includes the Twin Prime Conjecture.
Undoubtedly, this belongs to the realm of traditional number theory research. Current research methods are mainly focused on techniques like the Prime Number Theorem and sieve methods.