Charles Dupin

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Pierre Charles François Dupin (born October 6, 1784 in Varzy, France; died 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 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.

[edit] References

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

[edit] See also

• Dupin cyclide