  Riemann function $\xi(s)=u+iv, s=\beta+1/2+it$ has the important symmetry:
$v=0$ if $\beta=0$. For $\beta>0$ we prove $|u|>0$ inside any root-interval
$I_j=[t_j,t_{j+1}]$ and $v$ has opposite signs at two end-points of $I_j$. They
imply local peak-valley structure and $||\xi||=|u|+|v/\beta|>0$ in $I_j$.
Because each $t$ must lie in some $I_j$, then $||\xi||>0$ is valid for any $t$.
By the equivalence $Re(\frac{\xi'}{\xi})>0$ of Lagarias(1999), we show that RH
implies the peak-valley structure,which may be the geometric model expected by
Bombieri(2000).
