 De numeris triangularibus et inde de progressionibus arithmeticis: Magisteria magna

"De numeris triangularibus et inde de progressionibus arithmeticis: Magisteria magna" is a work by the mathematician and scholar Luca Pacioli, who lived during the Renaissance period. The title translates to "On Triangular Numbers and Towards Arithmetic Progressions: The Great Masterpiece." In this work, Pacioli discusses various concepts related to triangular numbers, which are figures that can form an equilateral triangle, and how these numbers relate to arithmetic progressions.