LEONARDO DA VINCI 1452-1519

Leonardo da VINCI Vinci, 1452–Amboise, 1519 Ornithology and Fluid Mechanics; the Flight of Birds with and against the Wind Black chalk, pen and brown ink About 1505 Biblioteca Ambrosiana, Milan, Codex Atlanticus, fol. 845r Leonardo da VINCI Vinci, 1452–Amboise, 1519 The Division of Fractions by Fractions Pen and brown ink About 1497–1502/1504 Leonardo’s calculation errors are well known, but he also had conceptual difficulties with mathematics. On this page from Manuscript M, he contests the rule for dividing a fraction by a fraction ( 2/3÷3/4=8/9 ) on the grounds that, as it is divided, the result should be smaller. But 8/9 is larger than 2/3 … Institut de France, Paris, Ms L, folio 10v and folio 11r 108 109 i i, i , 2/3 / = 8/9) on the grounds that, as it is divided, the result should be smaller. But 8/9 is larger than 2/3 … I i , i , , li li