Michael David Spivak was an American mathematician specializing in differential geometry, an expositor of mathematics, and the founder of Publish-or-Perish Press.
Rekenstenen zijn kleine steentjes, later stukjes aardewerk, gegraveerd met geometrische tekens die dienden als kunstmatig geheugensysteem bij de afwikkeling van leveringen van goederen, bijvoorbeeld bij de vroege beschavingen in Mesopotamië.
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