FYI January 22, 2018

On This Day

871 – Battle of Basing: The West Saxons led by king Æthelred I are defeated by the Danelaw Vikings at Basing.
The Battle of Basing was a battle on 22 January 871 at Old Basing in what is now the English county of Hampshire. It was one of a series of battles that took place following an invasion of the then kingdom of Wessex by an army of Danes. Both battle and campaign are described in the Anglo-Saxon Chronicle.[1][2][3]

The Danes had established a camp at Reading, and the previous battles of Englefield, Reading and Ashdown had proved indecisive, with victories to both sides.[1][2]

Two weeks after the Saxon victory at Ashdown, the armies met again at Basing. The Saxon army, led by King Ethelred, was beaten by the Danes. But just like its predecessors, this battle was indecisive, and it was followed two months later by the Battle of Marton, where the Vikings again prevailed. In April Ethelred died, to be succeeded by Alfred the Great, and much of King Alfred’s 28-year reign was taken up with the Danish conflict.[1][3]

Born On This Day

1880 – Frigyes Riesz, Hungarian mathematician and academic (d. 1956)
Frigyes Riesz (Hungarian: Riesz Frigyes, Hungarian pronunciation: [ˈriːs ˈfriɟɛʃ]; 22 January 1880 – 28 February 1956) was a Hungarian[1][2] mathematician who made fundamental contributions to functional analysis.

Life and career
He was born into a Jewish family in Győr, Kingdom of Hungary, Austria-Hungary and died in Budapest, Hungary. Between 1911 and 1919 he was a professor at the Franz Joseph University in Kolozsvár, Austria-Hungary. Then, he was the rector and a professor at the University of Szeged, as well as a member of the Hungarian Academy of Sciences.[3] and the Polish Academy of Learning. He was the older brother of the mathematician Marcel Riesz.

Riesz did some of the fundamental work in developing functional analysis and his work has had a number of important applications in physics. He established the spectral theory for bounded symmetric operators in a form very much like that now regarded as standard.[1] He also made many contributions to other areas including ergodic theory and he gave an elementary proof of the mean ergodic theorem.

Riesz founded the Acta Scientiarum Mathematicarum journal together with Alfréd Haar.

He had an uncommon method of giving lectures: he entered the lecture hall with an assistant and a docent. The docent then began reading the proper passages from Riesz’s handbook and the assistant inscribed the appropriate equations on the blackboard—while Riesz himself stood aside, nodding occasionally.[4]

Riesz, Frigyes; Szőkefalvi-Nagy, Béla (1990) [1955]. Functional Analysis. New York: Dover Publications. ISBN 978-0-486-66289-3.



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