What is "algorismus"

Algorismus can refer to:

• Algorismus (Norse text), a section of Hauksbók
• Al-Khwārizmī

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Algorismus is a short treatise on mathematics, written in Old Icelandic. It is the oldest text on mathematics in a Scandinavian language and survives in the early fourteenth-century manuscript Hauksbók. It is probably a translation from Latin into Old Norse of some pages included in more ancient books such as Carmen de Algorismo by De Villa Dei of 1200, Liber Abaci by Fibonacci of 1202, and Algorismus Vulgaris by De Sacrobosco of 1230.