Rolle's theorem

[rohlz]
noun Mathematics.
  1. the theorem that a differentiable function having equal values at the endpoints of an interval has a derivative equal to zero at some point in the interval.

Origin of Rolle's theorem

1890–95; named after Michel Rolle (died 1719), French mathematician
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018