thumb|Schoenflies's grave at the [[Frankfurt Main Cemetery]]
Arthur Moritz Schoenflies (; 17 April 1853 – 27 May 1928), sometimes written as Schönflies, was a German mathematician, known for his contributions to the application of group theory to crystallography, and for work in topology.
Schoenflies was born in Landsberg an der Warthe (modern Gorzów, Poland). Arthur Schoenflies married Emma Levin (1868–1939) in 1896. He studied under Ernst Kummer and Karl Weierstrass, and was influenced by Felix Klein.
The Schoenflies problem is to prove that an <math>(n - 1)</math>-sphere in Euclidean n-space bounds a topological ball, however embedded. This question is much more subtle than it initially appears.
He studied at the University of Berlin from 1870 to 1875. He obtained a doctorate in 1877,
- Einführung in die mathematische Behandlung der Naturwissenschaft. 1st edition, Dr. E. Wolff, 1895; 2nd editions 1931 (with Walther Nernst)
- Entwicklung der Mengenlehre und ihrer Anwendungen. Teubner, 1913 (with Hans Hahn).
- Kristallsysteme und Kristallstruktur, Teubner 1891
- Theorie der Kristallstruktur. Ein Lehrbuch. Gebr. Borntraeger, 1923.
- Einführung in die Hauptgesetze der zeichnerischen Darstellungsmethoden, Teubner 1908, Project Gutenberg ebook
- Articles: Mengenlehre (1898), Projektive Geometrie (1909), Kinematik (1902), Kristallographie (with Theodor Liebisch, Otto Mügge), in Klein's encyclopedia.
See also
- Fyodorov–Schoenflies–Bieberbach theorem
- Jordan–Schoenflies theorem
- Schoenflies notation
- Schoenflies displacement
- Heine–Borel theorem
- Geometrical crystallography before X-rays