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**simplependulum** Riemann Hypothesis is really hard to understand , even for undergraduates .

You may say what so difficult ? The real part of all the zeros of zeta function in $\displaystyle (0,1) $ is $\displaystyle \frac{1}{2} $ , which is what mathematicians need to prove , but do you really understand the actual meaning behind this ? Why is that important to prove the zeros all lying on the critical line ? What can it be applied in various aspects ? It is hard to understand ...