The Whetstone of Witte by Recorde

The Whetstone of Witte by Recorde

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Credit: ROYAL ASTRONOMICAL SOCIETY/SCIENCE PHOTO LIBRARY

Caption: Whetstone of Witte. This work is by the Welsh mathematician and physician Robert Recorde (1512-1558). It covers whole numbers, the extraction of roots and irrational numbers. It contains the first recorded use of the equals sign and the first use of the plus and minus signs in an English language book. This is the title page of the first edition, published in 1557 in London.

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Keywords: 1500s, 1557, 16th century, algebra, book, equals symbol, first use, frontispiece, historical, history, mathematical, mathematics, minus sign, notation, plus sign, robert recorde, symbols, text, the key to mathematics, title page, whetstone of witte, writing

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