The Hindu-Arabic Numerals c9.148
The Hindu-Arabic Numerals c9.148
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c9.148
² *De ratione abaci.* In this he describes "quandam formulam, quam ob honorem sui praeceptoris mensam Pythagoream nominabant . . . a posterioribus appellabatur abacus." This, as pictured in the text, is the common Gerbert abacus. In the edition in Migne's *Patrologia Latina*, Vol. LXIII, an ordinary multiplication table (sometimes called Pythagorean abacus) is given in the illustration.