Ihsan Oktay Anar's 1996 novella, The Book of Devices, is a skeleton key to the ever-inventive author's fictional world set in the Ottoman times. Here are the wonderful histories of the triumphs and tribulations of three Ottoman inventors, as reported by the narrators of events and relators of traditions. By turns humorous and touching, these interlinked stories are nutshells of vividly imagined past. While we follow Yafes Chelebi and his two successors in their search for the secret of the perpetual motion,

Learning Abstract mathematics is a slow and complex process. This is partly because a student of mathematics must not only try to grasp the ideas and master the techniques of approaching mathematical problems, but she must also learn the language of mathematics. This is often a cause of unease for many students in their first serious mathematics course. The present text intends to help such students. It is designed to be used as a textbook in introductory abstract mathematics courses that are usually taken