Felix Christian Klein was a German mathematician, mathematics educator and historian of mathematics, known for his work in group theory, complex analysis, non-Euclidean geometry, and the associations
Felix Klein, ante 1897 Accademia delle Scienze di Torino 0078 B
Carl Louis Ferdinand von Lindemann was a German mathematician who proved in 1882 that π is a transcendental number, meaning it is not a root of any nonzero polynomial with rational coefficients.
Felix Klein
…Nelson Cole Friedrich Dingeldey Henry B. Fine Erwin Freundlich Robert Fricke Philipp Furtwängler Axel Harnack Mellen Haskell Adolf Hurwitz Edward Kasner Ferdinand von Lindemann Alexander Ostrowski Julio Rey Pastor Hermann Rothe Friedrich Schilling Virgil Snyder Edward Van Vleck Walther von Dyck Adolf Weiler Henry Seely White…