Abstract

The important and influential mathematician Felix Hausdorff was also the author of several remarkable philosophical books and essays. About his unusual biography between philosophy and topology we have only little knowledge. We know only few personal documents and letters. Among Hausdorff’s letters that have been preserved (about 130), the letters and postcards to the librarian, translator and artist Franz Meyer in Jena (10) give an important insight into Hausdorff’s biography and his philosophical development. They also inform about his way from a philosopher, who liked to play with Nietzsche’s thoughts, to a pure mathematician