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Robert Recorde (c. 1510 – 1558) was a Welsh physician and mathematician. He introduced the "equals" sign (=) in 1557. 1510 was a common year starting on Saturday (see link for calendar) of the Gregorian calendar. ...
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The equal sign, equals sign, or = is a mathematical symbol used to indicate equality. ...
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A member of a respectable family of Tenby, Wales, he entered the University of Oxford in about 1525, and was elected a fellow of All Souls College in 1531. Having adopted medicine as a profession, he went to the University of Cambridge to take the degree of M.D. in 1545. He afterwards returned to Oxford, where he publicly taught mathematics, as he had done prior to going to Cambridge. It appears that he afterwards went to London, and acted as physician to King Edward VI and to Queen Mary, to whom some of his books are dedicated. He was also controller of the Royal Mint. After being sued for defamation by a political enemy, he was arrested for debt and died in the King's Bench prison, Southwark, in 1558. Harbour of Tenby in Nov, 2001 Tenby (Welsh: Dinbych-y-Pysgod, fortlet of the fishes) is a town in Pembrokeshire, west Wales, lying on Carmarthen Bay. ...
The University of Oxford (often called Oxford University), located in the city of Oxford, England, is the oldest university in the English-speaking world. ...
All Souls College (in full: The College of All Souls of the Faithful Departed, of Oxford) is one of the constituent colleges of the University of Oxford in the United Kingdom. ...
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Edward VI (12 October 1537 – 6 July 1553) became King of England and Ireland on 28 January 1547, at just nine years of age. ...
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Recorde published several works upon mathematical subjects, chiefly in the form of dialogue between master and scholar, such as the following:
- The Grounde of Artes, teachings the Worke and Practise, of Arithmeticke, both in whole numbers and fractions (c. 1540)
- The Pathway to Knowledge, containing the First Principles of Geometry ... bothe for the use of Instrumentes Geometricall and Astronomicall, and also for Projection of Plattes (London, 1551)
- The Castle of Knowledge, containing the Explication of the Sphere both Celestiall and Materiall, etc. (London, 1556)
- The Whetstone of Witte, which is the second part of Arithmetike, containing the Extraction of Rootes, the Cossike Practice, with the Rules of Equation, and the Woorkes of Surde Numbers (London, 1557). This was the book in which the equals sign was introduced, and the first English book on algebra.
- a medical work, The Urinal of Physic (1548), frequently reprinted.
Sherburne states that Recorde also published Cosmographiae isagoge, and that he wrote a book De Arte faciendi Horologium and another De Usu Globorum et de Statu temporum. Recorde's chief contributions to the progress of algebra were in the way of systematizing its notation. Robert Recordes Arithmetic: or, The Ground of Arts was one of the first printed English textbooks on arithmetic and the most popular of its time. ...
The equal sign, equals sign, or = is a mathematical symbol used to indicate equality. ...
The name Algebra (from Arabic: الجبر, al-jabr) is derived from the treatise written by the Persian mathematician titled Al-Kitab al-Jabr wa-l-Muqabala (meaning The Compendious Book on Calculation by Completion and Balancing), which provided symbolic operations for the systematic solution of linear and quadratic equations. ...
See also
In mathematics, two mathematical objects are considered equal if they are precisely the same in every way. ...
Zenzizenzizenzic is the eighth power or exponent of a number. ...
Numerous mathematicians who have made contributions to the history of mathematics have hailed from the country of Wales. ...
St. ...
References - This article incorporates text from the Encyclopædia Britannica Eleventh Edition, a publication now in the public domain.
Encyclopædia Britannica, the 11th edition The Encyclopædia Britannica Eleventh Edition (1910–1911) is perhaps the most famous edition of the Encyclopædia Britannica. ...
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