**Meet the editor**

The book editor Dr. Paul Bracken is a professor in the Department of Mathematics at the University of Texas located in Edinburg, TX. He has a BSc degree from the University of Toronto and PhD degree from the University of Waterloo in Canada. His research interests include applications of differential geometry and partial differential equations to problems in mathematical physics such

as gravity as well as problems in quantum theory and quantum field theory. He has published well over 100 papers in journals and books and given talks at various meetings and conferences and different levels. This is the third volume he has contributed to and published with InTech publisher.
