multiple abacus
Liber Abaci was created in 1202.
is abaci still used in todays world
Normally we say abacuses, pronounced "abba cusses;" some particular people use abaci, usually pronounced "abba sigh." The excruciatingly correct pronounce abaci like a Roman "abba key."
the abacus replaced the abaci
The book is named Liber abaci.
Plural of abacus: abaci or abacuses.
A book on arithmetic called Liber Abaci, or Book of Abacus.
His treatise, Liber abaci (1202), contains the famous Fibonacci sequence.
the Fibonacci sequence was first published by Leonardo Fibonacci in his book "Liber Abaci" in 1202.
Leonardo Fibonacci first recorded his sequence in his book Liber Abaci, which was published in 1202.
An abacus is a mechanical device for performing arithmetical calculations. Abaci are usually a wooden frame with beads used to represent numbers.
They didn't have electronic calculators. Abacuses (or is it abaci? no clue... oh well...) are calculators, and they could use them to calculate things.