Conical Refraction and Higher Microlocalization

The main topic of the book is higher analyticmicrolocalization and its application to problems ofpropagation of singularities. The part on highermicrolocalization could serve as an introduction to thesubject. The results on propagation refer to solutions oflinear partial differentialoperators with characteristicsof variable multiplicity and are of conical refraction type.The relation and interplay between these results and resultsor constructions from geometrical optics in crystal theoryis discu