# The Key to Mathematics by Oughtred

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**Credit:** ROYAL ASTRONOMICAL SOCIETY/SCIENCE PHOTO LIBRARY

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**Keywords:**
1600s,
1647,
17th century,
algebra,
book,
clavis mathematicae,
england,
english,
historical,
history,
mathematical,
mathematics,
multiplication symbol,
notation,
page,
symbols,
text,
the key of the mathematics,
the key to mathematics,
william oughtred,
writing

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