He was trained by an engineer- architect Pier Francesco Clementi and worked as an engineer-architect until died on 1573 without much recognition until hundred years later by the math society as a great Italian mathematician.

Bombelli followed Clementi into the profession and acquired a patron, Alessandro Rufini. The major engineering project on which Bombelli was employed was the reclamation of the marshes of the Val du Chiana. It was at a time when the reclamation work had been suspended that he wrote his treatise on algebra in the peaceful atmosphere of his patron’s villa in Rome.

Rafael Bombelli was the first to propose the idea of complex numbers. Bombelli wrote about imaginary numbers in his very influential book

*Algebra*which was published in 1572. In his book, Bombelli solved equations, using the method of del Ferro/Tartaglia, he introduced +i and -i and described how they both worked in

*Algebra*.

**Rafael Bombelli – Italian mathematician**