Res Extensa
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René Descartes used the term res extensa and its opposite res cogitans in his philosophical system called the Cartesian system. Res extensa was used to denote the physical world and res cogitans was used to denote the thinking being, the being that perceives its own beingness.
[edit] See also
[edit] References
http://www.swif.uniba.it/lei/foldop/foldoc.cgi?res+cogitans+-+res+extensa
