A variable rate refining triangulation

A new variable rate refining subdivisionB4 for the solution of equations with piecewise linear homotopies and restart homotopies is described. The essential virtue of the subdivisionB4 is that it offers vast latitude to the user. In particular, the parameters ofB4 can be set so one restriction ofB4 is thatJ3 triangulation and another restriction is the octahedral subdivision. More generally, full flexibility is available in the placement of local focal points, and perhaps most importantly,B4 permits the new capability of refining coordinates at variable andindependent rates.