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Liber Abaci

1202 · 13th century

Liber Abaci (the Book of Calculation) is a treatise on arithmetic completed by Leonardo of Pisa, known as Fibonacci, in 1202 and revised in 1228. It taught the Hindu–Arabic numerals and their use in commercial arithmetic, such as bookkeeping, currency conversion and the calculation of interest. It helped replace Roman numerals in European commerce and contains the rabbit problem that gives rise to the Fibonacci sequence.

Liber Abaci
Image: Public domain · Wikimedia Commons

Mentioned in 1 state history

Republic of Pisa

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Cite this entry
APA
The Epoch Institute. (2026). Liber Abaci. In The Epoch Institute Encyclopedia. https://the-epoch-institute.org/encyclopedia/liber-abaci
MLA
“Liber Abaci.” The Epoch Institute Encyclopedia, The Epoch Institute, 2026, https://the-epoch-institute.org/encyclopedia/liber-abaci. Accessed .
Chicago
The Epoch Institute. “Liber Abaci.” The Epoch Institute Encyclopedia. 2026. https://the-epoch-institute.org/encyclopedia/liber-abaci.
Harvard
The Epoch Institute (2026) ‘Liber Abaci’, The Epoch Institute Encyclopedia. Available at: https://the-epoch-institute.org/encyclopedia/liber-abaci (Accessed: ).

Last reviewed October 2026Random entry ↻