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Charles Dupin, 1849. Dit le savant: - On prétend qu'il sait tout excepté pourtant mettre sa cravate. (Called the Wise. One assumes that he knows everything, apart from how to tie his cravat). Baron Pierre Charles François Dupin (1784-1873) was a French Catholic mathematician, engineer, economist 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.