Blsides his arithmetic Robert Recorde wrote an astronomy, a geomery, an algebra, a book in medicine. and prebably some other works now lost. The book on astronomy, printed in 1551, is called The Castle of Knowledgeand was one of the first works to introduce the Copernican system to English readers. Recorde's geometry, The pathewait to knowledge, was also printed in 1551 and contains an abridgment of Euclid's Elements. |
|
Of historical interest here is recorde's algebra. The Whestone of Witte, published in 1557, for it was in this book that our modern symbol for equality was used for the first time. Recorde justified his adoption of a pair of equal parallel line segments for the symbol of eqyality "bicause noe 2 thynges can be moare equalle."
 | |