Jacques Touchard
Mathematician, Deceased Person
1885 – 1968
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Who was Jacques Touchard?
Jacques Touchard was a French mathematician. In 1953, he proved that an odd perfect number must be of the form 12k + 1 or 36k + 9. In combinatorics and probability theory, he introduced the Touchard polynomials. He is also known for his solution to the ménage problem of counting seating arrangements in which men and women alternate and are not seated next to their spouses.
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