11. He also prepared and published the first modern edition of Fibonacci's " Liber Abaci ". 12. Square plinths with decorative moulding support shafts with unusual abaci with such extensive chamfering that they are almost circular. 13. The south aisle, added in the 13th century and unblocked in 1867 during the abaci and octagonal responds. 14. The abaci are of two types : square and plain and circular and decorated and these are of different proportions. 15. Computers started out as abaci as far back as 2400 BC . They have very slowly evolved to what we have today. 16. Fibonacci followed this convention when writing numbers such as in his influential work " Liber Abaci " in the 13th century. 17. He also introduced Europe to the sequence of Fibonacci numbers, which he used as an example in " Liber Abaci ". 18. "Liber Abaci " was among the first Western books to describe Hindu Arabic numbers traditionally described as " Arabic Numerals ". 19. Fibonacci, in his 1202 book " Liber Abaci " lists several methods for finding Egyptian fraction representations of a rational number. 20. He also indicates that a suspiciously familiar third instance of these types of problems is to be found in Fibonacci's Liber Abaci .
