Giovanni Ceva

In 1686, however, he was designated as the Professor of Mathematics at the University of Mantua and worked there for the rest of his life.

The theorem, already known to Yusuf Al-Mu'taman ibn Hűd in 11th century, states that if three line segments are drawn from the vertices of a triangle to the opposite sides, then the three line segments are concurrent if, and only if, the product of the ratios of the newly created line segments on each side of the triangle is equal to one.

Finally, Ceva wrote De Re Nummaria in 1711, which was one of the first books in mathematical economics.

Giovanni Ceva also studied applications of mechanics and statics to geometric systems.

At one point, however, he incorrectly resolved that the periods of oscillation of two pendulums were in the same ratio as their lengths, but he later realized and corrected the error.