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Information about Girard Desargues



Gérard Desargues (February 21 or March 2, 1591-October 1661) was a French mathematician and engineer, who is considered one of the founders of projective geometry. He is the eponym of Desargues' theorem and of the crater Desargues on the Moon.

Born in Lyon, Desargues came from a family devoted to service to the French crown. His father was a royal notary, an investigating commissioner of the Seneschal's court in Lyon (1574), the collector of the tithes on ecclesiastical revenues for the city of Lyon (1583) and for the diocese of Lyon.

Gérard Desargues worked as an architect from 1645. Prior to that, he had worked as a tutor and may have served as an engineer and technical consultant in the entourage of Richelieu.

As an architect, Desargues planned several private and public buildings in Paris and Lyon. As an engineer, he designed a system for raising water that he installed near Paris. It was based on the use of the at the time unrecognized principle of the epicycloidal wheel.

His work was rediscovered and republished in 1864. His works were subsequently collected in L'oeuvre mathématique de Desarques (ed. by René Taton; Paris, 1951).

See also Desarguesian plane.

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mathematician is a person whose primary area of study and research is the field of mathematics.

Problems in mathematics

Some people incorrectly believe that mathematics has been fully understood, but the publication of new discoveries in mathematics continues at an immense
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Projective geometry is a non-metrical form of geometry. First developed by Desargues in the 17th century, it did not achieve prominence as a field of mathematics until the early 19th century through the work of Poncelet and others.
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eponym is the name of a person, whether real or fictitious, who has (or is thought to have) given rise to the name of a particular place, tribe, era, discovery, or other item. An eponymous person is the person referred to by the eponym.
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In projective geometry, Desargues' theorem, named in honor of Gérard Desargues, states:

In a projective space, two triangles are in perspective axially if and only if they are in perspective centrally.

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Desargues is an ancient lunar crater that is located near the northern limb of the Moon, on the western hemisphere. It lies nearly due south of Pascal crater, and southeast of the Brianchon crater.
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The Moon as seen by an observer on Earth
Orbital characteristics
Periapsis: 363,104 km
0.0024 AU
Apoapsis: 405,696 km
0.0027 AU
Semi-major axis: 384,399 km
0.
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Ville de Lyon

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Civil law notaries are trained jurists who often receive the same training as advocating jurists — those with a legal education who become litigators such as barristers in England and Wales and Northern Ireland or avocats in France and in Quebec.
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A seneschal was an officer in the houses of important nobles in the Middle Ages. In the French administrative system of the Middle Ages, the term sénéchal was also a royal officer in charge of justice and control of the administration in southern provinces, equivalent to the
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A tithe (from Old English teogoþa "tenth") is a one-tenth part of something, paid as a (usually) voluntary contribution or as a tax or levy, usually to support a Jewish or Christian religious organization.
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The Roman Catholic Metropolitan Archdiocese of Lyon is a Roman Catholic ecclesiastical territory in France. It incorporates the ancient Archdiocese of Vienne. The current Cardinal-Archbishop is Philippe Cardinal Barbarin.
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Architecture is the art and science of designing buildings and structures. A wider definition often includes the design of the total built environment: from the macrolevel of town planning, urban design, and landscape architecture to the microlevel of construction details and,
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Armand Cardinal de Richelieu

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epicycle — which rolls without slipping around a fixed circle. It is a particular kind of roulette.

If the smaller circle has radius r, and the larger circle has radius R = kr, then the parametric equations for the curve can be given by:

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Year 1951 (MCMLI
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In finite geometry a Desarguesian plane, named after Gérard Desargues, is a plane in which Desargues' theorem holds. The ordinary real projective plane is of course a Desarguesian plane. But there are examples of finite geometries where the theorem does not hold.
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The MacTutor History of Mathematics archive is an award-winning website maintained by John J. O'Connor and Edmund F. Robertson and hosted by the University of St Andrews in Scotland.
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