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| Keywords: Christoffer Dybvad Decarithmia 01.jpeg Decarithmia Ded er Thinde-Regnskab 1602 By Danish mathematician Christoffer Dybvad 1578-1622 About decimal fractions See also Simon Stevin 1548/49 “1620 Flemish mathematician and engineer Source http //www astrologimuseum dk/biografica/1500/Resources/dybvaddecarithmi jpeg Mathematics books book covers single pages etc da Christoffer Dybvad PD-old | ||||
