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[[Lacan]]'s works abound in references to the famous phrase by [[Descartes]], ''cogito ergo sum'' ("I think, therefore I am").  This phrase (which [[Lacan]] often refers to simply as 'the ''[[cogito]]''') comes to stand, in [[Lacan]]'s work, for [[Descartes]]'s entire [[philosophy]].   [[Lacan]]'s attitude to [[Cartesian]]ism is extremely complex, and only a few of the most important points can be summarised here.