Bifurcations of Wavefronts on an r-corner

Abstract

We introduce the notion of reticular Legendrian unfoldings in order to investigate stabilities of bifurcations of wavefronts generated by a hypersurface germ with a boundary, a corner, or an r-corner in a smooth n dimensional manifold. We define several stabilities of reticular Legendrian unfoldings and prove that they and the stabilities of corresponding generating families are all equivalent and give the classification of generic bifurcations of wavefronts in the cases r=0,n<=5 and r=1,n<= 3respectively.