  An absorbing weighted Fermat-Torricelli tree of degree four is a weighted
Fermat-Torricelli tree of degree four which is derived as a limiting tree
structure from a generalized Gauss tree of degree three (weighted full Steiner
tree) of the same boundary convex quadrilateral in R^2: By letting the four
variable positive weights which correspond to the fixed vertices of the
quadrilateral and satisfy the dynamic plasticity equations of the weighted
quadrilateral, we obtain a family of limiting tree structures of generalized
Gauss trees which concentrate to the same weighted Fermat-Torricelli tree of
degree four (universal absorbing Fermat-Torricelli tree). The values of the
residual absorbing rates for each derived weighted Fermat-Torricelli tree of
degree four of the universal Fermat-Torricelli tree form a universal absorbing
set. The minimum of the universal absorbing Fermat-Torricelli set is
responsible for the creation of a generalized Gauss tree of degree three for a
boundary convex quadrilateral derived by a weighted Fermat-Torricelli tree of a
boundary triangle (Angiogenesis of degree three). Each value from the universal
absorbing set contains an evolutionary process of a generalized Gauss tree of
degree three.
