11/15/2023 0 Comments Lattice multiplication instructions![]() ![]() In Chapter 3 of his Liber Abaci, Fibonacci does describe a related technique of multiplication by what he termed quadrilatero in forma scacherii (“rectangle in the form of a chessboard”). In fact, however, no use of lattice multiplication by either of these two authors has been found. 825) or by Fibonacci in his Liber Abaci (Italy, 1202, 1228). It is sometimes erroneously stated that lattice multiplication was described by Muḥammad ibn Mūsā al-Khwārizmī (Baghdad, c. This is reinforced by noting that the Arabic term for the method, shabakh, has the same meaning as the Italian term for the method, gelosia, namely, the metal grille or grating (lattice) for a window. The mathematician and educator David Eugene Smith asserted that lattice multiplication was brought to Italy from the Middle East.
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