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Emanuel Sperner

Emanuel Sperner German mathematician, best known for two theorems

German mathematician, best known for two theorems
The basics
Quick Facts
Intro German mathematician, best known for two theorems
A.K.A. Шпернер, Эмануэль
Was Mathematician Professor Educator
From Germany
Type Academia Mathematics
Gender male
Birth 9 December 1905, Prusinowice, Opole Voivodeship, Poland
Death 31 January 1980, Laufen, Germany (aged 74 years)
Star sign SagittariusSagittarius
The details
Biography

Emanuel Sperner (9 December 1905 – 31 January 1980) was a German mathematician, best known for two theorems. He was born in Waltdorf (near Neiße, Upper Silesia, now Nysa, Poland), and died in Sulzburg-Laufen, West Germany. He was a student at Carolinum in Nysa and then Hamburg University where his advisor was Wilhelm Blaschke. He was appointed Professor in Königsberg in 1934, and subsequently held posts in a number of universities until 1974.

Sperner's theorem, from 1928, says that the size of an antichain in the power set of an n-set (a Sperner family) is at most the middle binomial coefficient(s). It has several proofs and numerous generalizations, including the Sperner property of a partially ordered set.

Sperner's lemma, from 1928, states that every Sperner coloring of a triangulation of an n-dimensional simplex contains a cell colored with a complete set of colors. It was proven by Sperner to provide an alternate proof of a theorem of Lebesgue characterizing dimensionality of Euclidean spaces. It was later noticed that this lemma provides a direct proof of the Brouwer fixed-point theorem without explicit use of homology.

Sperner's students included Kurt Leichtweiss and Gerhard Ringel.

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Reference sources
References
http://www.math.ac.vn/publications/vjm/vjm_27/No.3/187-222_Park.PDF
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http://data.bibliotheken.nl/id/thes/p073337323
https://www.idref.fr/095864393
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