# Clavis mathematicae

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{{Short description|Mathematics book written by William Oughtred}}{{Infobox book
| image             = Clavis mathematicae (book cover).jpg
| author            = William Oughtred
| language          = Latin
| pub_date          = 1631
}}
'''''Clavis mathematicae''''' (English: '''''The Key of Mathematics''''') is a [mathematics](/source/mathematics) book written by [William Oughtred](/source/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.<ref>{{Cite web|title=Mathematical Treasure: William Oughtred's The Key of the Mathematicks {{!}} Mathematical Association of America|url=https://www.maa.org/press/periodicals/convergence/mathematical-treasure-william-oughtred-s-the-key-of-the-mathematicks|access-date=2022-02-20|website=www.maa.org}}</ref><ref>{{Cite web|title=Clavis Mathematicae {{!}} work by Oughtred {{!}} Britannica|url=https://www.britannica.com/topic/Clavis-Mathematicae|access-date=2022-02-20|website=www.britannica.com|language=en}}</ref>

==References==
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Category:1631 books
Category:Mathematics books

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Adapted from the Wikipedia article [Clavis mathematicae](https://en.wikipedia.org/wiki/Clavis_mathematicae) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Clavis_mathematicae?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.