Rolle's theorem

noun

ˈrȯlz- 

ˈrōlz-

: a theorem in mathematics: if a curve is continuous, crosses the x-axis at two points, and has a tangent at every point between the two intercepts, its tangent is parallel to the x-axis at some point between the intercepts

Word History

Etymology

Michel Rolle †1719 French mathematician

First Known Use

1858, in the meaning defined above