Arithmetica
Arithmetica, an ancient Greek text on mathematics written by the mathematician Diophantus in the 2nd century CE is a collection of 130 algebra problems giving numerical solutions of determinate equations (those with a unique solution), and indeterminate equations.
Equations in the book are called Diophantine equations. The method for solving these equations is known as Diophantine analysis. Most of the Arithmetica problems lead to quadratic equations. It was these equations which inspired Pierre de Fermat to propose his conjecture that for the equation where x, y, and z are integers, n cannot be an integer greater than 2. (See also:Fermat's last theorem).