English: Antonio Fais (Ploaghe, April 25th 1841 – Sassari, April 20th 1925) was an Italian mathematician and engineer. He was rector at the University of Cagliari from 1897 to 1898. [1][2]

As an engineer he worked for the Royal Sardinian Railways for the development of the rail line sector located next to the town of Oristano.[3]

In 1865 was appointed professor of infinitesimal calculus and algebra at the University of Cagliari.[4]

He moved at the Accademia di Bologna in 1876, where he taught infinitesimal calculus and algebra, and graphical static.[5]

His main scientific activity in the field of mathematics was focused on the study of the differential geometry of curves and surfaces and the differential equationss, on which he published several articles.[6]

Fais due to his scientific activity was awarded with the Benedictine medal by the Accademia di Bologna, in 1897, with the Cross Order of Saints Maurice and Lazarus in 1897 and was appointed Knight of the Order of the Crown of Italy in 1905.

During his life Fais could meet and work together prominent mathematicians of his time such as the Italians Felice Casorati, Antonio Pacinotti and Eugenio Beltrami, and the French J.L.Bertrand.[7]