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**Descartes**(French pronunciation: ) is a commune in the Indre-et-Loire department in central France. It is approximately 29 kilometers east of Richelieu and about 48 kilometers east of Loudun, on the banks of the Creuse River.The

**evil demon**, also known as**Descartes**' demon, malicious demon and evil genius, is an epistemological concept that features prominently in Cartesian philosophy.In the first of his 1641 Meditations on First Philosophy,**Descartes**imagines that an**evil demon**, of "utmost power and cunning has employed all his energies in order to deceive me."The

**dream argument**is the postulation that the act of dreaming provides preliminary evidence that the senses we trust to distinguish reality from illusion should not be fully trusted, and therefore, any state that is dependent on our senses should at the very least be carefully examined and rigorously tested to determine whether it is in fact reality.**Descartes**' rule of signs and its generalizations.**Descartes**' rule of signs asserts that the difference between the number of sign variations in the sequence of the coefficients of a polynomial and the number of its positive real roots is a nonnegative even integer. It results that if this number of sign variations is zero, then the polynomial ...In algebra, a

**quartic function**is a function of the form = + + + +,where a is nonzero, which is defined by a polynomial of degree four, called a quartic polynomial.. A quartic equation, or equation of the fourth degree, is an equation that equates a quartic polynomial to zero, of the form**Descartes**. Profoundly influenced by Euclid,**Descartes**was a rationalist who invented the foundationalist system of philosophy. He used the method of doubt, now called Cartesian doubt, to systematically doubt everything he could possibly doubt until he was left with what he saw as purely indubitable truths. Using these self-evident propositions ...History. The general concept of artificial machines capable of producing copies of themselves dates back at least several hundred years. An early reference is an anecdote regarding the philosopher RenĂ©

**Descartes**, who suggested to Queen Christina of Sweden that the human body could be regarded as a machine; she responded by pointing to a clock and ordering "see to it that it reproduces offspring."