Rene Descartes

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Noun1.Rene Descartes - French philosopher and mathematicianRene Descartes - French philosopher and mathematician; developed dualistic theory of mind and matter; introduced the use of coordinates to locate a point in two or three dimensions (1596-1650)
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In addition, the cogito ergo sum implies a sum res cogitans, meaning that being's essence is thinking whereas res is the scholastic substantia (concrete entity).
thought is inseparable from my nature; it is what I am: sum res cogitans.