Fra Luca Bartolomeo de Pacioli Italian mathematician (c. 1445 - 1517) Luca Pacioli first published the Venetian method of keeping accounts known as Double-entry book-keeping. He became a Franciscan friar in the 1470s. He was a travelling mathematics teacher until in 1497 he accepted an invitation by Lodovico Sforza to work in Milan where he collaborated with Leonardo da Vinci. He published a number of works on mathematics, including:
- Summa de arithmetica, geometrica, proportioni et proportionalita (Venice 1494), in which he describes double entry book-keeping.
- Geometry (1509), a Latin translation of Euclid.
- Divina proprotione (Venice 1509), a work on mathematical and artistic proportion that contains some illustrations by Leonardo.
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