Fibonacci
Life
Leonardo of Pisa learned Mediterranean calculation practices and used Liber Abaci (1202) to explain Hindu-Arabic numerals and practical arithmetic to Latin readers. The numerals were already known in Europe and spread gradually.
Decisive moments
Learning calculation in Bugia
BugiaHis father represented Pisan merchants in Bugia, where Leonardo encountered local calculation and later learned from several Mediterranean traditions.
Liber Abaci — demonstrating practical calculation
It taught Hindu-Arabic numerals and fractions through exchange, interest, alloy, and profit-sharing problems. Adoption proceeded gradually through manuscripts, schools, and practice.
The rabbit problem and a sequence’s long afterlife
The rabbits were one small exercise, and the same recurrence appears earlier in Indian prosody. Its exact limiting link to the golden ratio was studied later.
If this person hadn't existed
This is a thought experiment about influence, not a verified historical fact.
Liber Abaci was not the one gate through which zero and Hindu-Arabic numerals entered Europe. It was an unusually influential Latin textbook within broader networks of translation, trade, and teaching, and adoption varied over centuries.
Influence network
Beyond MathVoyage
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