THIS is the fourth edition of a book which has been received with warm approval by English and Continental geometers. The first eight sections present no notable changes from the corresponding ...

Robert Kelly is managing director of XTS Energy LLC, and has more than three decades of experience as a business executive. He is a professor of economics and has raised more than $4.5 billion in ...

Our new podcasts helps you learn English with real conversations at an easy level. Listen to the trailer to find out more. Hello! I'm Neil and I want to tell you about our new podcast to help you ...