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Kbel Bschenteyn . Les pages de titre des deux arithmtiques allemandes dites la mme anne Dans arithmtique de Kbel gauche toutes les oprations sont expliques avec des jetons alors que arithmtique de Bschenteyn prsent algorisme Rara Arithmetica de Smith Chelson publishing company ca Kbel and Bschenteyn PDold Arabic numerals thcentury