卢道夫
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Carl Ludolf Menzzer 门泽尔
Ludolf von Wartenberg 伯格
Ludolf Rischmüller 鲁道夫·里希莫勒
Ludolf Luehmann 理鲁道夫·鲁曼
Ludolf Camphausen 康普豪森
Ludolf von Krehl 雷尔
By the time Ludolf van Ceulen died in 1610, he had spent many years of his life tediously calculating pi, resulting in only 35 accurate digits.
BBC: 3.14 and the rest
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