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 contains 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 edition brought the autodidactic Oughtred acclaim amongst mathematicians, but the English-language reissue 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
  1. "Mathematical Treasure: William Oughtred's The Key of the Mathematicks | Mathematical Association of America". www.maa.org. Retrieved 2022-02-20.
  2. "Clavis Mathematicae | work by Oughtred | Britannica". www.britannica.com. Retrieved 2022-02-20.
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