Adolf Kneser

Adolf Kneser
Adolf Kneser in Prague, Sep.1929
Born	(1862-03-19)19 March 1862 Grüssow, Mecklenburg
Died	24 January 1930(1930-01-24) (aged 67) Breslau, Silesia
Nationality	German
Alma mater	University of Berlin
Known for	Four-vertex theorem Kneser's theorem Kneser sequence Tait–Kneser theorem
Scientific career
Fields	Mathematics
Institutions	University of Breslau
Doctoral advisor	Leopold Kronecker Ernst Eduard Kummer
Doctoral students	Stefan Cohn-Vossen Rudolf Weyrich
Other notable students	Alfreds Meders

Adolf Kneser (19 March 1862 – 24 January 1930) was a German mathematician.

He was born in Grüssow, Grand Duchy of Mecklenburg-Schwerin and died in Breslau, Germany.

He is the father of the mathematician Hellmuth Kneser and the grandfather of the mathematician Martin Kneser.

Kneser is known for the first proof of the four-vertex theorem that applied in general to non-convex curves. Kneser's theorem on differential equations is named after him, and provides criteria to decide whether a differential equation is oscillating. He is also one of the namesakes of the Tait–Kneser theorem on osculating circles.