Rational Bézier surface is a widely used surface fitting tool in CAD. When all the weights of a rational Bézier surface go to infinity in the form of
Mather gave the necessary and sufficient conditions for the finite determinacy s-mooth function germs with no more than codimension 4.The theorem is very effect
In this paper,we study the dierentiability of solutions on the boundary for equations of type Lλu=θ2uθx2+jxj2λθ2uθy2=f(x;y),where r is an arbitrary positi