The Jewelry Repair Manual A mathematician who collaborated directly

A mathematician who collaborated directly with Erdos himself on a paper (there are 511 such individuals) has an Erdos number of 1

commentarii

An Appendix discusses certain aspects of Greek astronomy and the indebtedness of the Copernican system to Ptolemaic and Islamic methods

Mind Reading with Cards

The Jewelry Repair Manual A mathematician who collaborated directlyWritten for the jeweler who wishes to expand his jewelry repair department, this profusely illustrated manual will help both novices and experienced crafters. It provides clear, step by step instructions for cleaning and repairing jewelry and setting stones, as well as complete descriptions of the tools and equipment needed, and their proper use and care. Newcomers to the trade will find detailed explanations of such basic procedures as filing,