14 lines
1022 B
Markdown
14 lines
1022 B
Markdown
---
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title: "Clavis mathematicae"
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chunk: 1/1
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source: "https://en.wikipedia.org/wiki/Clavis_mathematicae"
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category: "reference"
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tags: "science, encyclopedia"
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date_saved: "2026-05-05T08:43:47.337039+00:00"
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instance: "kb-cron"
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---
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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.
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== References == |