Charles Dupin

Charles Dupin

Pierre Charles François Dupin (October 6, 1784 in Varzy, Nièvre – January 18, 1873 in Paris, France) was a French Catholic mathematician. He studied geometry with Monge at the École Polytechnique and then became a naval engineer. 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 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.

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

References

• Entry in New Catholic Dictionary (1910)
• Entry in Catholic Encyclopedia
• Entry in MacTutor History of Mathematics

See also

• Dupin cyclide

Persondata
Name	Dupin, Charles
Alternative names
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Date of birth	October 6, 1784
Place of birth
Date of death	January 18, 1873
Place of death