Ludolph van Ceulen

Ludolph van Ceulen (28 January 1540–31 December 1610) was a German mathematician. Born in Hildesheim, Germany, like many Germans during the Catholic Inquisitions, he emigrated to the Netherlands.

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He moved to Delft to teach fencing and mathematics. In 1594 he opened a fencing school in Leiden. In 1600 he was appointed the first professor of mathematics at the University of Leiden. He died in Leiden.

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Ludolph van Ceulen spent a major part of his life calculating the numerical value of the mathematical constant ?, using essentially the same methods as those employed by Archimedes some 1800 years earlier. He published a 20-decimal value in his 1596 book Van den Circkel ("On the Circle"), later expanding this to 35 decimals. After his death, the "Ludolphine number",

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