Peeping into Fibonacci’s Study Room

The following collects observations I made during the reading of Fibonacci’s
Liber abbaci in connection with a larger project, “abbacus mathematics analyzed
and situated historically between Fibonacci and Stifel”. It shows how attention
to the details allow us to learn much about Fibonacci’s way to work. In many
respects, it depends crucially upon the critical edition of the Liber abbaci
prepared by Enrico Giusti and upon his separate edition of an earlier version
of its chapter 12 – not least on the critical apparatus of both. This, and more
than three decades of esteem and friendship, explain the dedication.