It seems to me that [Weisstein's] encyclopedia inaugurates a new era for two reasons: one, as the author says, this book lives and breathes hand-in-hand with the Internet. This book's ease of reference, despite a lack of index due to size limitation, and interactive features place it squarely and successfully in this new age. The second reason why the book is a "first" in the technology age is that CAS are used extensively by the author, and Mathematica codes are included in this new edition. SIAM Review, Vol. 46 Praise for the first edition: " This extraordinary volume beautifully captures many of the discoveries in mathematics in a readable and authoritative fashion.What is truly exceptional is that this encyclopedia is the product of a single dedicated and talented author.This book is an excellent resource for both teaching and research libraries." --Journal of Mathematical Psychology " I cannot praise the work too highly: Its vast scope and readability make the encyclopedia a great success.

" -- Robert Dickau "Impressive.I found it very interesting and spent time reading about a variety of topics for which I had very little background or knowledge.A valuable source of information." -- W.E. Schiesser, Lehigh University "Users will actually look forward to picking it up. one of the more important tools that will help college students actually grasp important mathematical concepts, written in such a way as to invite students to return to it time and again to discover that they really can understand mathematics and apply its concepts to derive solutions to practical problems.".