Christian Felix Klein was a German mathematician and mathematics educator, known for his work with group theory, complex analysis, non-Euclidean geometry, and on the associations between geometry and group theory. His 1872 Erlangen program, classifying geometries by their basic symmetry groups, was an influential synthesis of much of the mathematics of the time.
Ferdinand Georg Frobenius was a German mathematician, best known for his contributions to the theory of elliptic functions, differential equations, number theory, and to group theory. He is known for the famous determinantal identities, known as Frobenius–Stickelberger formulae, governing elliptic functions, and for developing the theory of biquadratic forms. He was also the first to introduce the notion of rational approximations of functions, and gave the first full proof for the Cayley–Hamilton theorem. He also lent his name to certain differential-geometric objects in modern mathematical physics, known as Frobenius manifolds.
Wilhelm Johann Eugen Blaschke was an Austrian mathematician working in the fields of differential and integral geometry.
Hugo Albert Emil Hermann Dingler was a German scientist and philosopher.
Hieronymus Georg Zeuthen was a Danish mathematician.
Martin Ohm was a German mathematician and a younger brother of physicist Georg Ohm.
In geometry, a flexible polyhedron is a polyhedral surface without any boundary edges, whose shape can be continuously changed while keeping the shapes of all of its faces unchanged. The Cauchy rigidity theorem shows that in dimension 3 such a polyhedron cannot be convex.
For a surface in three dimension the focal surface, surface of centers or evolute is formed by taking the centers of the curvature spheres, which are the tangential spheres whose radii are the reciprocals of one of the principal curvatures at the point of tangency. Equivalently it is the surface formed by the centers of the circles which osculate the curvature lines.
Albrecht Beutelspacher is a German mathematician and founder of the Mathematikum. He is a professor emeritus of the University of Giessen, where he held the chair for geometry and discrete mathematics from 1988 to 2018.
Arthur Besse is a pseudonym chosen by a group of French differential geometers, led by Marcel Berger, following the model of Nicolas Bourbaki. A number of monographs have appeared under the name.
Hellmuth Stachel is an Austrian mathematician, a Professor of Geometry at the Technical University of Vienna, who is known due to his contributions to geometry, kinematics and computer-aided design.
Georg Scheffers was a German mathematician specializing in differential geometry. He was born on 21 November 1866 in the village of Altendorf near Holzminden. Scheffers began his university career at the University of Leipzig where he studied with Felix Klein and Sophus Lie. Scheffers was a coauthor with Lie for three of the earliest expressions of Lie theory:
Bronshtein and Semendyayev is the informal name of a comprehensive handbook of fundamental working knowledge of mathematics and table of formulas originally compiled by the Russian mathematician Ilya Nikolaevich Bronshtein and engineer Konstantin Adolfovic Semendyayev.
David Rytz von Brugg was a Swiss mathematician and teacher.
Carl Friedrich Geiser was a Swiss mathematician, specializing in algebraic geometry. He is known for the Geiser involution and Geiser's minimal surface.
Friedrich Bachmann was a German mathematician who specialised in geometry and group theory.
In geometry, focal conics are a pair of curves consisting of either
Friedrich Georg Schilling was a German mathematician.
Klaus Mainzer is a German philosopher and scientist. Mainzer is the president of the European Academy of Sciences and Arts. He is the author of the widely translated, cited, and reviewed book Thinking in Complexity.
Rudolf Ernst Rothe was a German applied mathematician.
