Source: wikibot/felix-klein
= Felix Klein
{wiki=Felix_Klein}
Felix Klein (1849–1925) was a prominent German mathematician known for his contributions to various fields of mathematics, including group theory, geometry, and topology. He is particularly famous for the Klein bottle, which is a non-orientable surface, as well as for his work in the development of the Erlangen Program, which proposed a new way to classify geometries based on their underlying symmetry.