Dicuil (9th century) on triangular and square numbers
Helen E. Ross|Betty I. Knott
Dicuil was a ninth-century Irish monk who taught at the Carolingian school of Louis Pious. He wrote Computus or astronomical treatise in Latin about 814–16, which contains chapter on tri...
British Journal for the History of Mathematics|Stirling Online Research Repository (University of Stirling)