According to Lammenranta, "The Descartes Triangle is often understood as a form of formal or logical circularity, in which the conclusion appears as one of the premises."

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Lammenranta does not discuss "The Descartes Triangle" in terms of formal or logical circularity. The statement seems to misrepresent discussions around Descartes' method of doubt and the circularity criticism, which is often related to his argument for the existence of God and the reliability of clear and distinct perceptions, not a "Descartes Triangle."

According to Lammenranta, "The Descartes Triangle Is Often Understood as a Form