"ceul010" . . "Ludolph van Ceulen" . . _:Bd39ddf3d39318632e4bd78c15071d7b9 . "1540-01-28"^^ . "Leiden" . "1610-12-31"^^ . "Ceulen, Ludolph van (1540-1610)" . "Ludolph" . . "wiskundige" . . "van Ceulen" . "Ludolph van Ceulen" . _:Bd39ddf3d39318632e4bd78c15071d7b9 . _:Bd39ddf3d39318632e4bd78c15071d7b9 "2021-02-08"^^ . _:Bd39ddf3d39318632e4bd78c15071d7b9 . _:Bd39ddf3d39318632e4bd78c15071d7b9 . _:Bd39ddf3d39318632e4bd78c15071d7b9 . _:Bd39ddf3d39318632e4bd78c15071d7b9 . _:Bd39ddf3d39318632e4bd78c15071d7b9 .