Adrien-Marie Legendre
A quiet mathematical architect whose polynomials and transformations became essential tools for physicists and engineers navigating curved spaces.
1752–1833 (age 81)·French mathematician·Birthday: September 18
Biography
Born into a wealthy Parisian family in 1752, Adrien-Marie Legendre’s comfortable background allowed him to pursue mathematics with singular focus, independent of academic posts for much of his life. His career unfolded during the tumultuous years of the French Revolution, a period he navigated by contributing to the committee standardizing weights and measures, which led to the metric system. Legendre’s true legacy is etched in the fundamental tools he developed. His work on elliptic integrals paved the way for future exploration, while the Legendre polynomials became indispensable for solving problems in physics, particularly in celestial mechanics and potential theory. A modest but persistent figure, he famously, and perhaps frustratingly, saw credit for the method of least squares initially awarded to the younger Carl Friedrich Gauss, though Legendre’s publication was first. He worked into old age, his textbooks shaping generations, a foundational but often overshadowed pillar of 19th-century mathematics.
#1 When Adrien-Marie Was Born
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Adrien-Marie's Life & Times
The world at every milestone
1752Born
1757Started school
1765Became a teenager
1768Could drive
1770Could vote
1773Turned 21
1782Turned 30
1792Turned 40
1802Turned 50
1812Turned 60
1822Turned 70
1832Turned 80
1833Died at 81
Key Achievements
- Developed the Legendre polynomials, crucial functions for solving Laplace's equation in spherical coordinates.
- Was the first to publish the method of least squares in 1805, a cornerstone of regression analysis and data fitting.
- Made significant advances in number theory, including a proof of the law of quadratic reciprocity.
- Authored the highly influential textbook 'Éléments de géométrie', which dominated geometry teaching for decades.
Did You Know?
The asteroid 26950 Legendre is named in his honor.
He lost his family fortune during the French Revolution and was forced to work on government projects.
His portrait is based on a sketch of a French politician also named Legendre, as no verified image of the mathematician is known to exist.
“However sublime are the researches on the heavenly bodies, they must not make us forget the usefulness of those works whose aim is at social happiness.”
