A minimal integral of the Riemann $\Xi$-function
  In this paper we obtain an equilibrium sequence $\{\omega_n\}$ for which the following holds true: the areas (measures) of the figures corresponding to the positive and negative parts, respectively, of the graph of the function $\Xi(t),\ t\in[\omega_n,\omega_{n+1}]$ are equal. Dedicated to the 500th anniversary of rabbi L\"ow. 
Jan Moser
math.CA