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[[File:Charles Dupin.jpg|thumb|Charles Dupin. Lithograph (1820) by Julien-Léopold Boilly.]]Baron '''Pierre Charles François Dupin''' (6 October 1784, Varzy, Nièvre – 18 January 1873, Paris, France) was a French Catholic mathematician, engineer, economist, and politician.  He is particularly known for his work in mathematics, where the Dupin cyclide and Dupin indicatrix are named after him; and for his work in the field of statistical and thematic mapping (he created the earliest known choropleth map).

Dupin was born in Varzy in France, the son of Charles Andre Dupin, a lawyer, and Catherine Agnes Dupin.

He studied geometry with Monge at the École Polytechnique and then became a naval engineer (ENSTA). From 1807 he was responsible for the restoration of the damaged port and arsenal at Corfu. In 1813 he founded the Toulon Maritime Museum.

In 1819 he was appointed professor at the Conservatoire des Arts et Métiers; he kept this post until 1854. In 1822, he was elected a foreign member of the Royal Swedish Academy of Sciences.

In 1808, he participated in the Greek science revival by teaching mathematics and mechanics lessons in Corfu. One of his students was [[Giovanni Carandino (nonfiction)|Giovanni Carandino]], who would go on to be the founder of the Greek Mathematics School in the 1820s.

In 1818, Dupin was elected to the body of the French Academy of Sciences, one of the Institut de France's five Academies.

His mathematical work was in descriptive and differential geometry. He was the discoverer of conjugate tangents to a point on a surface and of the Dupin indicatrix.

In 1826 he published a thematic map showing the distribution of illiteracy in France, using shadings (from black to white), the first known instance of what is called a choropleth map today. Duplin had been inspired by the work of the German statisticians [[Georg Hassel (nonfiction)|Georg Hassel]] and [[August Friedrich Wilhelm Crome (nonfiction)|August Friedrich Wilhelm Crome]].

Dupin was named rapporteur for the central jury of the Exposition des produits de l'industrie française en 1834. For each branch of industry he noted the quantities and value of French exports and imports, with comparative figures for 1823, 1827 and 1834.

In addition, he had a political career and was appointed to the Senate in 1852.

== In the News ==

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== Fiction cross-reference ==

* [[Crimes against mathematical constants]]
* [[Gnomon algorithm]]
* [[Mathematics]]

== Nonfiction cross-reference ==

* [[Mathematician (nonfiction)]]

External links:

* [https://en.wikipedia.org/wiki/Charles_Dupin Charles Dupin] @ Wikipedia

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