Mathematician:Pavel Samuilovich Urysohn

Ukrainian mathematician mainly working in analysis and topology.

Introduced the concept of compactness with Pavel Alexandrov in 1923.

Drowned in rough seas while swimming off the coast of France.

Also written as Uryson.

Nationality
Ukrainian

History

 * Born: 3 Feb 1898, Odessa, Ukraine
 * Died: 17 Aug 1924 off the coast of Batz-sur-Mer, France

Theorems and Definitions

 * Fréchet-Urysohn Space (with Maurice René Fréchet)
 * Urysohn Space (also known as a $T_{2 \frac 1 2}$ Space
 * Urysohn Function
 * Urysohn's Metrization Theorem
 * Urysohn's Lemma
 * Menger-Urysohn Dimension (with Karl Menger)

Books, Publications, etc.

 * 1924: Zur Theorie der topologischen Räume (with Pavel Alexandrov)