Victor Guido Feodor Eberhard (17 January 1861 – 28 April 1927) was a blind German geometer, known for

Eberhard's theorem In mathematics, and more particularly in polyhedral combinatorics, Eberhard's theorem partially characterizes the multisets of polygons that can form the faces of simple convex polyhedra. It states that, for given numbers of triangles, quadrilateral ...

partially characterizing the multisets of faces that can form

convex polyhedra A convex polytope is a special case of a polytope, having the additional property that it is also a convex set contained in the n-dimensional Euclidean space \mathbb^n. Most texts. use the term "polytope" for a bounded convex polytope, and the wo ...

Life

Eberhard was born on 17 January 1861 in

Pless Pleß or Pless may refer to: Places *Pleß, a municipality in the district of Unterallgäu in Bavaria, Germany * Pszczyna (German: Pleß), a town in southern Poland ** Duchy of Pless, a historic territory in Silesia * Pleß (mountain), a mounta ...

, in the Prussian Province of Silesia (now Pszczyna in southern Poland), where his father Richard Eberhard was a jurist. he became blind in 1873. He earned a doctorate in 1885 at the University of Breslau, with a dissertation ''Über eine räumlich involutorische Verwandtschaft 7. Grades und ihre Kernfläche 4. Ordnung'' concerning 7th-order spatial involutions, supervised by

Heinrich Schröter Heinrich Eduard Schröter (8 January 1829 – 3 January 1892) was a German mathematician, who studied geometry in the tradition of Jakob Steiner. Life and work Schröter went to (along with mathematicians Alfred Clebsch, Rudolf Lipschitz, Carl ...

. He continued his studies at the Humboldt University of Berlin and completed his

habilitation Habilitation is the highest university degree, or the procedure by which it is achieved, in many European countries. The candidate fulfills a university's set criteria of excellence in research, teaching and further education, usually including a ...

in 1888 at the University of Königsberg, with a habilitation thesis proving Eberhard's theorem. He became a professor in 1895 at Martin Luther University of Halle-Wittenberg. The Philosophical Faculty of the university did not support his hire, and he was paid little in his new position. Publishing only small works in geometry after his habilitation, he was forced to retire in 1926. He died in 1927.

Books

Eberhard was the author of two books: *''Zur Morphologie der Polyeder'' (''On the morphology of polyhedra'', Teubner, 1891), expanded from his habilitation thesis *''Die Grundgebilde Der Ebenen Geometrie'' (''The foundations of plane geometry'', Teubner, 1895)

References

{{DEFAULTSORT:Eberhard, Victor 1861 births 1927 deaths 19th-century German mathematicians University of Wrocław alumni Academic staff of the University of Halle German blind people Blind scholars and academics 20th-century German mathematicians Scientists with disabilities Mathematicians from the German Empire