1. Stefan Banach was a Polish mathematician. He was born on 30th March 1892 in Kraków.
Since childhood, showed uncommon mathematical ability. He was a lecturer and author of
many books, including textbooks for high school math. After the outbreak of World War I, he
worked as a supervisor in the construction of roads. He was not drafted into the army because
of left-handedness and eye diseases. After returning to Krakow for a living tutoring. Still
studying alone. His first work related to the Fourier series, the Maxwell equations. The
dissertation gave the first definition of space, named after his name as a Banach space. Finally
cemented base extremely important in modern applications of mathematics. He gave her the
fundamental theorem, introduced the terminology that mathematicians have accepted all over
the world. He was died on 31th August 1945