Portrait of Luca Pacioli, father of accounting, painted by Jacopo de' Barbari, 1495, (Museo di Capodimonte).

Portrait of Luca Pacioli, father of accounting, painted by Jacopo de' Barbari, 1495, (Museo di Capodimonte).

Whilst in Milan, Leonardo became very interested in Mathematics, also.  He illustrated one of the first modern math books, done by a friend of his, Luca Pacioli.

Whilst in Milan, Leonardo became very interested in Mathematics, also. He illustrated one of the first modern math books, done by a friend of his, Luca Pacioli.

Leonardo da Vinci drew the illustrations for Luca Pacioli's 1509 book De Divina Proportione (The Divine Proportion). Drawing of the Duodecedron Abscisus Elevatus Vacuus, consisting of 120 equilateral triangles, from the manuscript of the book.

Leonardo da Vinci drew the illustrations for Luca Pacioli's 1509 book De Divina Proportione (The Divine Proportion). Drawing of the Duodecedron Abscisus Elevatus Vacuus, consisting of 120 equilateral triangles, from the manuscript of the book.

La Divine proportion de Luca Pacioli

La Divine proportion de Luca Pacioli

La Divine proportion de Luca Pacioli

La Divine proportion de Luca Pacioli

La A di Luca Pacioli. Lettera A, De divina proportione, Venezia 1509

La A di Luca Pacioli. Lettera A, De divina proportione, Venezia 1509

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