The Riemann zeta function, in the complex plane. The real part \displaystyle{ \operatorname{Re}(s) } of the number is drawn horizontally, the imaginary part \displaystyle{ \operatorname{Im}(s) } vertically. White dots show the zeros where \displaystyle{ \operatorname{Re}(s)=\tfrac{1}{2} }. Click to get a full view.

The Riemann hypothesis is a mathematical question (conjecture). Finding a proof of the hypothesis is one of the hardest and most important unsolved problems of pure mathematics. Pure mathematics is a type of mathematics that is about thinking about mathematics. This is different from trying to put mathematics into the real world. The answer to the Riemann hypothesis is "yes" or "no".