What's That Number? Counting To 100! Av John Allan

<P><STRONG><EM>Combinatorics and Number Theory of Counting Sequences</EM></STRONG> is an introduction to the theory of finite set partitions and to the enumeration of cycle decompositions of permutations.</P><br/><br/><P>The...

Join the mechanics for a tour of the fastest flying machines. From spitfires to scramjets, uncover the secrets behind some of the speediest planes. Discover... - The world's fastest jet plane- The ultra-fast planes of the future- The wingsuits that...