#include <MFImplicitMF.h>
An MFImplicitMF represents a manifold which is described as the inverse image of zero. That's just a fancy way of saying that points "u" on the manifold satisfy an equation F(u)=0.
MFImplicitMF is a base class, so constructors for particular types of IMF's have to be called. These register routines that perform the operations that MFImplicitMF requires.