Anders / Other

(my small collection of calculating and cryptographic devices, texts in Dutch only)

Klokken / Clocks


The Mathematics Genealogy Project
(my mathematical ancestry: Robert Tijdeman - Jan Popken - Johannes van der Corput - Jan Cornelis Kluyver - ???)

The Erdös Number Project
(my Erdös number is 2, see the official data)

The Mathematical Fiction Homepage