Construction of a Class of Sharp Löwner Majorants for a Set of Symmetric Matrices

Figure 4

(a) Parameter region for and ; (b) zoomed region around marked with the black rectangle in (a); (c) isolines of the quadratic forms and in the (1,2)-plane for all normalized for the marked black points of (a); (d) evaluation of the quadratic forms in the (2,3)-plane.

(a)

(b)

(c)

(d)