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  2. Descartes' rule of signs - Wikipedia

    en.wikipedia.org/wiki/Descartes'_rule_of_signs

    In mathematics, Descartes' rule of signs, described by René Descartes in his La Géométrie, counts the roots of a polynomial by examining sign changes in its coefficients. The number of positive real roots is at most the number of sign changes in the sequence of polynomial's coefficients (omitting zero coefficients), and the difference ...

  3. Descartes (crater) - Wikipedia

    en.wikipedia.org/wiki/Descartes_(crater)

    Descartes is a heavily worn lunar impact crater that is located in the rugged south-central highlands of the Moon. To the southwest is the crater Abulfeda. It is named after the French philosopher, mathematician and physicist René Descartes. The rim of Descartes survives only in stretches, and is completely missing in the north.

  4. Descartes' theorem - Wikipedia

    en.wikipedia.org/wiki/Descartes'_theorem

    In geometry, Descartes' theorem states that for every four kissing, or mutually tangent, circles, the radii of the circles satisfy a certain quadratic equation. By solving this equation, one can construct a fourth circle tangent to three given, mutually tangent circles.

  5. Radical symbol - Wikipedia

    en.wikipedia.org/wiki/Radical_symbol

    In 1637 Descartes was the first to unite the German radical sign √ with the vinculum to create the radical symbol in common use today. [3] Encoding

  6. Evil demon - Wikipedia

    en.wikipedia.org/wiki/Evil_demon

    In Meditation Three, Descartes is going to establish not only that there is a God but that God is not a deceiver. When Descartes first introduces the evil demon he says, "I will suppose therefore that not God, who is supremely good and the source of truth, but rather some malicious demon, had employed his whole energies in deceiving me."

  7. Meditations on First Philosophy - Wikipedia

    en.wikipedia.org/wiki/Meditations_on_First...

    Meditations on First Philosophy, in which the existence of God and the immortality of the soul are demonstrated (Latin: Meditationes de Prima Philosophia, in qua Dei existentia et animæ immortalitas demonstratur) is a philosophical treatise by René Descartes first published in Latin in 1641.

  8. James L. Kraft - Wikipedia

    en.wikipedia.org/wiki/James_L._Kraft

    James Lewis Kraft (/ ˈ k r æ f t /; December 11, 1874 – February 16, 1953) was a Canadian-American entrepreneur and inventor and the founder of Kraft Foods Inc. Kraft immigrated to the United States from Canada in 1902.

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