Pacioli, Luca de
Fifteenth century Franciscan friar who wrote De Devina Propotione (1497), an attempt to re-discover the true shapes and proportions of the classical Roman alphabet. Pacioli also collaborated with Leonardo da Vinci, but he is best known for Summa de Arithmetica (1494), in which he provided the first printed description of double entry bookeeping.
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