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The cossist tradition was a school of abacist mathematics developed in Germany in the 15th century.

Notable cossists include Johann Faulhaber.

Historical Note

The word can be found in the title of Robert Recorde's 1557 work:

The Whetstone of Witte, whiche is the seconde parte of Arithmeteke: containing the extraction of rootes; the cossike practise, with the rule of equation; and the workes of Surde Nombers.

Linguistic Note

The word cossist originates from the Italian cosa (thing).