  We find upper and lower bounds of the multiplicities of irreducible
admissible representations $\pi$ of a semisimple Lie group $G$ occurring in the
induced representations $Ind_H^G\tau$ from irreducible representations $\tau$
of a closed subgroup $H$.
  As corollaries, we establish geometric criteria for finiteness of the
dimension of $Hom_G(\pi,Ind_H^G \tau)$ (induction) and of $Hom_H(\pi|_H,\tau)$
(restriction) by means of the real flag variety $G/P$, and discover that
uniform boundedness property of these multiplicities is independent of real
forms and characterized by means of the complex flag variety.
