| |
| | Leonardo of Pisa - LoveToKnow 1911 |
 | | Leonardo cannot be regarded as the inventor of that very great variety of truths for which he mentions no earlier source. |
 | | The Liber abaci, which fills 459 printed pages, contains the most perfect methods of calculating with whole numbers and with fractions, practice, extraction of the square and cube roots, proportion, chain rule, finding of proportional parts, averages, progressions, even compound interest, just as in the completest mercantile arithmetics of our days. |
 | | Among the contents of this book we simply mention a trigonometrical chapter, in which the words sinus versus arcus occur, the approximate extraction of cube roots shown more at large than in the Liber abaci, and a very curious problem, which nobody would search for in a geometrical work, viz. |
| www.1911encyclopedia.org /Leonardo_of_Pisa (970 words) |
|