Jean-Robert Argand was a Genevan amateur mathematician, born in Geneva on 18 July 1768 and dead on 13 August 1822. In 1806, while managing a bookstore in Paris, he privately published his Essay on a method of representing imaginary quantities in geometrical constructions, which set out the geometrical interpretation of complex numbers known as the Argand diagram, and he is known for the first rigorous proof of the fundamental theorem of algebra. The essay treated complex numbers by analytical geometry, interpreted the value i as a rotation of ninety degrees, and was the first to propose the modulus for the magnitude of vectors and complex numbers. It was republished in 1813 in the Annales de Mathématiques. His mathematics was self-taught and he belonged to no mathematical organisation.
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Jean-Robert Argand (UK: , US: , French: [ʒɑ̃ ʁɔbɛʁ aʁɡɑ̃]; July 18, 1768 – August 13, 1822) was a Genevan amateur mathematician.
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1. MacTutor History of Mathematics: Jean-Robert Argand biography
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Home Biographies History Topics Map Curves Search Jean Robert Argand Quick Info Born (possibly) 18 July 1768 Geneva, Switzerland Died (possibly) 13 August 1822 Paris, France Summary Jean-Robert Argand was an amateur Swiss mathematician best known as one
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Jean-Robert Argand (UK: , US: , French: [ʒɑ̃ ʁɔbɛʁ aʁɡɑ̃]; July 18, 1768, August 13, 1822) was a Genevan amateur mathematician.
In Branch: Geometry, Lead, field of work
In 1806, while managing a bookstore in Paris, he published the idea of the geometrical interpretation of complex numbers known as the Argand diagram and is known for the first rigorous proof of the fundamental theorem of algebra.
Principal Result: Fundamental Theorem of Algebra, Lead, principal result
In 1806, while managing a bookstore in Paris, he published the idea of the geometrical interpretation of complex numbers known as the Argand diagram and is known for the first rigorous proof of the fundamental theorem of algebra.
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