Charles Dupin

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Pierre Charles François Dupin
Born	(1784-10-06)6 October 1784 Varzy, France
Died	18 January 1873(1873-01-18) (aged 88) Paris, France
Known for	Choropleth map Dupin cyclide Dupin hypersurface Dupin indicatrix Dupin's theorem Malus-Dupin theorem
Scientific career
Fields	Mathematics Engineering Economics

Baron Pierre Charles François Dupin (French pronunciation: [pjɛʁ ʃaʁl fʁɑ̃swa dypɛ̃]; 6 October 1784, Varzy, Nièvre – 18 January 1873, Paris, France) was a French Catholic mathematician, engineer, economist^[1] and politician, particularly known for work in the field of mathematics, where the Dupin cyclide and Dupin indicatrix are named after him; and for his work in the field of statistical and thematic mapping.^[2] In 1826 he created the earliest known choropleth map.^[3]