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In this article Ayer attempts to make manifest this basic principal of Descartes through question which are some philosophical some are psycological and some questions upon on recognition.
Perhaps I can summarize this article to this point that, we must not past over this subject "I think so I exist" simply. Because both success and failure of Descarte' s philosophy is put in pledge for it.
But the most interesting part of the article is that it is opend and its conclusion is left for the readers. What has been under taken by the
author is preparing the whole introductions for the readers who desire to attain the truth.