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Descartes searched for an indubitable or undoubtable truth: something we can know with absolute certainty.
Something which CANNOT be doubted.
Is Descartes successful in his mission?
sources
https://www.youtube.com/watch?v=8npqoNjndHA
https://www.dailymotion.com/video/x2xvvz0
https://www.youtube.com/watch?v=MLKrmw906TM