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This paper focuses on a number of sources that could have inspired a very interesting kind of diagrams of coefficients of algebraic expressions appearing in a Catalan manuscript of ca. 1520. These diagrams are used in some problems to represent and operate on the algebraic expressions involved in the solving process. In this research, it has been necessary to delve into different medieval traditions.
This paper focuses on an anonymous Catalan manuscript of the early 16th century dealing with algebra and commercial arithmetic. More than half of it consists of a series of notes concerning parts of Luca Pacioli's Summa de Arithmetica, Geometria, Proportioni et Proportionalità, while most of the rest is related to Joan Ventallol's commercial arithmetic (1521). The use of a new kind of diagrams to...
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