Mathematician:Pierre Frédéric Sarrus

Mathematician
French mathematician who discovered a mnemonic rule for solving the determinant of a 3-by-3 matrix, named Sarrus' Scheme.

Demonstrated the Fundamental Lemma of the Calculus of Variations.

Discovered Fermat pseudoprimes to base $2$, now known as Sarrus numbers or Poulet numbers.

Nationality
French

History

 * Born: 10 March 1798, Saint-Affrique
 * Died: 20 November 1861

Theorems and Definitions

 * Sarrus Numbers
 * Sarrus' Scheme

Also known as
Usually known as Frédéric Sarrus.