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 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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Stefan Zweig (; November 28, 1881 – February 22, 1942 ) was an Austrian novelist, playwright, journalist and biographer.

Stefan Vladislav (; died after 1264 ) was the King of Serbia from 1233 / 4 to 1243.

Vladislav, sometimes numbered Vladislav II or Stefan Vladislav II (; 1270-1325 ) was the King of Syrmia from 1316 to 1325, and claimant to the Serbian Kingdom.

Stefan Uroš I (; 1223 – May 1, 1277 ), known as Uroš the Great was the King of Serbia from 1243 to 1276, succeeding his brother Stefan Vladislav.

Sveti Stefan,, now Aman Sveti Stefan including the Villa Miločer (; formerly Sveti Stefan Hotel ) (" Saint Stephen "; Serbian: Sveti Stefan / Свети Стефан, Sušćepan, ) is a small islet and hotel resort in Montenegro, approximately southeast of Budva.

Marek Stefan Borowski (; born January 4, 1946 in Warsaw, Poland ) is a Polish left-wing politician.

Count Jan Stefan Krukowiecki (; 1772 – 1850 ) was a Polish general and chairman of the Polish National Government ( prezes Rządu Narodowego ) during the November Uprising and general during Napoleonic Wars fighting in the troops of Napoleon.

Ivan Stefan (; in English also John Stephen ) ( c. 1300 / 1301 – 1373 (?

Stefan Lichański (; b. September 2, 1914 in Warsaw-October 30, 1983 in Warsaw, Poland ) was a Polish literature critic and writer.

* March 30 – Stefan Banach, Polish mathematician ( d. 1945 )

* March 27 – Stefan Wul, French writer ( d. 2003 )

* March 24 – Jožef Stefan, Slovenian physicist, mathematician, and poet ( d. 1893 )

* March 12 – King Stefan Dragutin of Serbia

Stephen Dragutin (, Stefan Dragutin ; died March 12, 1316 ) was a 13th and 14th-century Serb monarch, the King of Serbia from 1276 to 1282 and King of Syrmia ( Srem ) from 1282 to 1316.

The last election was held on March 26, 2006 and both ridings were won by the CDU: Dr. Stefan Scheffold ( Schwäbisch Gmünd ) and Winfried Mack ( Aalen ).

On March 25, 1196, Stefan Nemanja summoned a Council in Ras, where he officially abdicated in favour of his second son, Stefan, to whom he bequeathed all his earthly possessions.

Stefan Wul was the nom de plume of French science fiction writer Pierre Pairault ( 27 March 1922 – 26 November 2003 ).

* Stefan Lovgren, Corpses Frozen for Future Rebirth by Arizona Company, March 2005, National Geographic

The Ivan-fronted band ( described by the Austin American-Statesman as " simply singer Ivan Doroschuk and some hired guns " and by Stefan as a " tribute band ") began the " Dance If You Want Tour 2011 " with a well-attended and positively received performance at Austin's South by Southwest event in March, 2011.

Image: 20050314 Wladyslaw Bartoszewski and Stefan Wilkanowicz by Kubik. JPG | Władysław Bartoszewski and Stefan Wilkanowicz, Warsaw, March 14, 2005

* March 24-Joseph Stefan ( died 1893 ), Austro-Slovene physicist and mathematician.

His son Wolfgang was born on 17 March 1915, followed by the births of Klaus on 20 May 1917 and Stefan on 7 December 1926.

In March 1920 he was appointed director of the Hochschule für Musik in Berlin and between 1920 and 1932 he gave extensive musical tuition in a variety of subjects with Berthold Goldschmidt, Alois Hába, Jascha Horenstein, Julius Bürger, Ernst Krenek, Artur Rodziński, Stefan Wolpe, Zdenka Ticharich and Grete von Zieritz numbering among his students.

On 14 March 2012, in the aftermath of the 2011 – 12 season's failure, the club's general manager Stefan Nyman as well as CEO Anders Olson were fired from the club and replaced by the team's then assistant coach Patrik Sylvegård, who took over both Nyman's and Olson's positions.

Thanks to the help of Stefan Kisielewski, Herbert worked as a manager of the office of the Chief Management in the Union of Socialist Composers ( ZKP ) from September 1956 till March 1957.

Halmich became famous on German television with a promotional fight against German TV host Stefan Raab, in his show TV Total in March 2001.

Zygmunt Jan Kisielewski ( 27 March 1882 – 25 April 1942 ) was a Polish writer, brother of Jan August and father of Stefan.

The current mayor Stefan Sauer of the CDU was elected on 18 March 2007.

Stefan Ivan Kiszko ( 24 March 1952 – 23 December 1993 ), a 23-year-old local tax clerk of Ukrainian / Slovenian parentage, served 16 years in prison after he was wrongly convicted of her sexual assault and murder.

Stefan Olsdal ( born Stefan Alexander Bo Olsdal, 31 March 1974, Göteborg, Sweden ) is the bassist / guitarist of the alternative rock band Placebo and is part of the electronic dance / DJ and remix act Hotel Persona.