Retrieving "Merchant Class" from the archives

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1. Fibonacci

   Linked via "merchants"

   The term Fibonacci most commonly refers to Leonardo of Pisa (c. 1170 – c. 1250), an influential Italian mathematician. While the sequence that bears his name is his most enduring legacy, Fibonacci's contributions spanned commercial arithmetic, the adoption of the Hindu-Arabic numeral system in Europe, and the foundational study of geometric congruency. His work significantly bridged the gap between classical Euclidean geometry and the practical needs of medieval European [merchants](/ent…