Jean Jacques Bret (25 September 1781 – 29 January 1819) was a French professor of mathematics at the University of Grenoble.
He worked on analytical geometry, polynomial roots, and the theory of conics and quadrics.
In 1811 he became a professor at the faculty of science at the University of Grenoble and received a doctorate in 1812.
[2] Bret suggested a rule for the superior limits of the roots of polynomial in 1815.
The rule has been stated as: "if we add to unity a series of fractions whose numerators are the successive negative coefficients, taken positively, and whose denominators are the sums of the positive coefficients, including that of the first term, the greatest of the resulting values will be a superior limit of the roots of the equation.