Franciszek Leja (27 January 1885 in Grodzisko Górne near Leżajsk – 11 October 1979 in Kraków, Poland) was a Polish mathematician.
After international protest by prominent Italians including Benito Mussolini and the Vatican, 101 professors who were older than 40 were released from Sachsenhausen on February 8, 1940.
The homeless couple with no income decided to move to Grodzisko Górne where they have a small house and garden.
In Grodzisko Leja wrote the book on the calculus Rachunek różniczkowy i całkowy ze wstępem do równań różniczkowych.
[3] His main scientific interests concentrated on analytic functions, in particular the method of extremal points and transfinite diameters.