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Adrien-Marie Legendre, French mathematician and theorist (died 1833)

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Adrien-Marie Legendre
French mathematician (1752–1833)
Adrien-Marie Legendre was a French mathematician who made numerous contributions to mathematics. Well-known and important concepts such as the Legendre polynomials and Legendre transformation are named after him. He is also known for his contributions to the method of least…Source: Wikipedia (CC BY-SA)
September 18
Day of the year
September 18 is the 261st day of the year in the Gregorian calendar; 104 days remain until the end of the year.Source: Wikipedia (CC BY-SA)