Author:Robert Recorde

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Robert Recorde
(c. 1512/1510 – 1558)

Welsh physician and mathematician, who invented the "equals" sign (=) and also introduced the pre-existing "plus" sign (+) to English speakers in 1557.

Robert Recorde


  • The Grounde of Artes, teachings the Worke and Practise, of Arithmeticke, both in whole numbers and fractions (1543)
  • The Urinal of Physick (1548) Google book
  • The Pathewaie to Knowledge, containing the First Principles of Geometry … bothe for the use of Instrumentes Geometricall and Astronomicall, and also for Projection of Plattes (1551)
  • Castle of Knowledge (1556) external link
  • The Whetstone of Witte (1557) (transcription project)

Works about Recorde


Some or all works by this author were published before January 1, 1929, and are in the public domain worldwide because the author died at least 100 years ago. Translations or editions published later may be copyrighted. Posthumous works may be copyrighted based on how long they have been published in certain countries and areas.

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