Wrote with Poul Heegaard the first book on the foundations of combinatorial topology, then known as analysis situs
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Wrote with Poul Heegaard the first book on the foundations of combinatorial topology, then known as analysis situs
Text from Wikipedia, available under CC BY-SA 4.0.
Captured 2026-08-24 from Wikipedia. The archived copy is preserved so this citation survives link rot.