We investigate the global phase-portrait structure of a local version of th
e exact renormalization group (RG) equation for a fluctuating scalar field
of the order parameter. All the physical branches of the RG equation soluti
on for the fixed points belong to the attractor subspace to which the local
density of the Ginzburg-Landau-Wilson functional is attracted for largely
arbitrary initial configurations. The solution of the RG equation correspon
ding to the nontrivial fixed point determining the critical behavior under
the second-order phase transition is a fixed saddle point of this attractor
subspace separating the attraction domains of two stable solutions corresp
onding to the high- and low-temperature thermodynamic regimes.