Il matematico Ludolph van Ceulen si trasferì da Hildesheim a Delft e poi a L'Aia. Nel 1594 aprì una scuola di schermatura a L'Aia. Nel 1600 fu nominato primo professore di matematica all'Università di Leiden.
Fornì il primo grande contributo europeo da Archimede in poi, calcolando π. Arrivò a una stima di π, che è corretta fino a 35 cifre decimali.
Fece incidere i numeri sulla sua lapide.
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