Image caption: Felix Hausdorff, one of the founders of modern topology, in a photograph from 1913–1921.
Credit: Bonn University Library / Hausdorff Edition Bonn, Public Domain, via Wikimedia Commons.
Image caption: Felix Hausdorff, one of the founders of modern topology, in a photograph from 1913–1921.
Credit: Bonn University Library / Hausdorff Edition Bonn, Public Domain, via Wikimedia Commons.