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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.

René Descartes (/ d eɪ ˈ k ɑːr t / or UK: / ˈ d eɪ k ɑːr t /; French: [ʁəne dekaʁt] (); Latinized: Renatus Cartesius; 31 March 1596 – 11 February 1650: 58 ) was a French philosopher, mathematician, scientist and lay Catholic who invented analytic geometry, linking the previously separate fields of geometry and algebra.

Descartes was the lead ship of the Descartes class of protected cruisers built for the French Navy in the 1890s. The Descartes -class cruisers were ordered as part of a construction program directed at strengthening the fleet's cruiser force. At the time, France was concerned with the growing naval threat of the Italian and German fleets, and ...

The construction is also given by Descartes in his La Géométrie, see figure 2 on page 2. However, Descartes made no claim to originality and his audience would have been quite familiar with Euclid. Euclid's second proof in Book VI depends on the theory of similar triangles. Let AHB be a line segment of length a + b with AH = a and HB = b.

In arithmetic and algebra, the cube of a number n is its third power, that is, the result of multiplying three instances of n together. The cube of a number or any other mathematical expression is denoted by a superscript 3, for example 23 = 8 or (x + 1)3 . n3 = n × n2 = n × n × n.

Ibn Sina (Persian: ابن سینا; 980 – June 1037 CE), commonly known in the West as Avicenna (/ ˌ æ v ɪ ˈ s ɛ n ə, ˌ ɑː v ɪ-/), was a Persian polymath who is regarded as one of the most significant physicians, astronomers, philosophers, and writers of the Islamic Golden Age, and the father of early modern medicine.