Iamblichus attributes to them [the people in the Tigro- Euphrates basin] also a knowledge of proportion, and even the invention of the so called musical proportion. Though we possess no conclusive proof, we have nevertheless reason to believe that in practical calculation they used the abacus . ...Now, Babylon was once a great commercial centre, the metropolis of many nations, and it is therefore not unreasonable to suppose that her merchants employed this most improved aid to calculation.
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