Clavis mathematicae
Clavis mathematicae (English: The Key of Mathematics) is a mathematics book written by William Oughtred, originally published in 1631 in Latin. It was an attempt to communicate the contemporary mathematical practices, and the European history of mathematics, into a concise and digestible form. The book contained an addition in its 1647 English edition, "Easy Way of Delineating Sun-Dials by Geometry", which had been written by Oughtred earlier in life. The original addition brought the autodidactic Oughtred acclaim amongst mathematicians, but the English republication brought him celebrity, especially amongst tradesman who made use of the arithmetic in their labors. The book is also notable for using the symbol "x" for multiplication, a method invented by Oughtred.[1][2]
References
- "Mathematical Treasure: William Oughtred's The Key of the Mathematicks | Mathematical Association of America". www.maa.org. Retrieved 2022-02-20.
- "Clavis Mathematicae | work by Oughtred | Britannica". www.britannica.com. Retrieved 2022-02-20.