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Banach spaces are named after the Polish mathematician Stefan Banach who introduced them in 1920 – 1922 along with Hans Hahn and Eduard Helly .< ref >

In mathematics, especially functional analysis, a Banach algebra, named after Stefan Banach, is an associative algebra A over the real or complex numbers which at the same time is also a Banach space.

Later on, Stefan Banach amplified the concept, defining Banach spaces.

Hadamard also founded the modern school of linear functional analysis further developed by Riesz and the group of Polish mathematicians around Stefan Banach.

It is named for Hans Hahn and Stefan Banach who proved this theorem independently in the late 1920s, although a special case was proved earlier ( in 1912 ) by Eduard Helly, and a general extension theorem from which the Hahn – Banach theorem can be derived was proved in 1923 by Marcel Riesz.

This is due to Stefan Banach.

Stefan Banach (; March 30, 1892 – August 31, 1945 ) was a Polish mathematician.

Stefan Banach was born on 30 March 1892 at St. Lazarus General Hospital in Kraków, then part of Austro-Hungarian Empire.

Banach's parents were Stefan Greczek and Katarzyna Banach, both natives of the Podhale region.

* Page devoted to Stefan Banach

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