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Albert Girard

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  1. Albert Girard was a French-born mathematician. He studied at the University of Leiden. He "had early thoughts on the fundamental theorem of algebra" and gave the inductive definition for the Fibonacci numbers. He was the first to use the abbreviations 'sin', 'cos' and 'tan' for the trigonometric functions in a treatise. Girard was the first to state, in 1632, that each prime of the form 1 mod 4 was the sum of two squares. It was said that he was quiet-natured and, unlike most mathematicians, did not keep a journal for his personal life.
  2. Albert Girard was a Progressive Conservative party member of the Canadian House of Commons. His background was in business.
    • born on (66 years ago)
    • nationality: Canada

Printed dictionaries and other books with definitions for Albert Girard

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Google previewHistorical Encyclopedia of Natural and Mathematical Sciences (2009)

by Ari Ben-Menahem

Albert Girard (1629) conjectured that an equation of degree n always has n solutions in the domain of complex numbers. Attempts to prove this were made by Descartes, d'Alembert and others, but it was only Gauss (1799) who succeeded in ...

Google previewThe British encyclopedia, or, Dictionary of arts and sciences (1809)

by William Nicholson

Vieta first used the bar or line over the quantities, for a vinculum, thus n -f- h ; and Albert Girard the parenthesis, thus (a -\- b) ; the former way being now chiefly used by the English, and the latter by most other Europeans. Thus a -f- b x c, or ( a ...

Google previewCompanion Encyclopedia of the History and Philosophy of the Mathematical Sciences (2003)

by I. Grattan-Guinness

Albert Girard (1634) and Thomas Simpson (1753). The explicit expression ...

Google previewA New Mathematical and Philosophical Dictionary (1814)

Comprising an Explanation of Terms and Principles of Pure and Mixed Mathematics, and Such Branches of Natural Philosophy as are Susceptible of Mathematical Investigation. With Historical Sketches of the Rise, Progress and Present State of the Several Departments of These Sciences, and an Account of the Discoveries and Writings of the Most Celebrated Authors, Both Ancient and Modern by Peter Barlow

Albert Girard, an ingenious Flemish mathematician, died about the year 1633. The work which entitles ...

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