Erich Schönhardt was a German

Germans

The Germans are a Germanic ethnic group native to Central Europe. The English term Germans has referred to the German-speaking population of the Holy Roman Empire since the Late Middle Ages....

 mathematician

Mathematician

A mathematician is a person whose primary area of study is the field of mathematics. Mathematicians are concerned with quantity, structure, space, and change....

 known for his 1928 discovery of the Schönhardt polyhedron

Schönhardt polyhedron

In geometry, the Schönhardt polyhedron is the simplest non-convex polyhedron that cannot be triangulated into tetrahedra without adding new vertices...

, a non-convex polyhedron that cannot be partitioned into tetrahedra

Tetrahedron

In geometry, a tetrahedron is a polyhedron composed of four triangular faces, three of which meet at each vertex. A regular tetrahedron is one in which the four triangles are regular, or "equilateral", and is one of the Platonic solids...

 without introducing additional vertices

Vertex (geometry)

In geometry, a vertex is a special kind of point that describes the corners or intersections of geometric shapes.-Of an angle:...

.

Schönhardt studied at the University of Stuttgart

University of Stuttgart

The University of Stuttgart is a university located in Stuttgart, Germany. It was founded in 1829 and is organized in 10 faculties....

, and went on to do his graduate studies at the University of Tübingen, receiving his Ph.D. in 1920 for a thesis on Schottky group

Schottky group

In mathematics, a Schottky group is a special sort of Kleinian group, first studied by .-Definition:Fix some point p on the Riemann sphere...

s under the supervision of Ludwig Maurer

Ludwig Maurer

Ludwig Maurer was a German mathematician professor on the Tübingen University. He was the eldest son of Konrad von Maurer and Valerie von Faulhaber . His 1887 dissertation at the University of Strassburg was on the theory of linear substitutions, known today as matrix groups...

.
In the 1930s, he was the Dozentenführer (Nazi political leader of the faculty) at Tübingen, and was responsible for denouncing fellow Tübingen mathematician Erich Kamke

Erich Kamke

Erich Kamke was a German mathematician, who specialized in the theory of differential equations. Also, his book on set theory became a standard introduction to the field.-Biography:...

 for having married a Jewish woman. He moved back to the University of Stuttgart in 1936 and was rector

Rector

The word rector has a number of different meanings; it is widely used to refer to an academic, religious or political administrator...

there from 1939–1942.