Abacus

Abacus
Abacus A Chinese abacus, Suanpan Calculating-Table by Gregor Reisch: Margarita Philosophica, 1503. The woodcut shows Arithmeticainstructing an algorist and an abacist (inaccurately represented as Boethiusand Pythagoras). There was keen competition between the two from the introduction of the Algebra into Europe in the 12th century until its triumph...
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