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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 the polynomial's coefficients (omitting zero coefficients), and the difference ...
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 does not have any positive real roots, and, if this ...
Descartes's work provided the basis for the calculus developed by Leibniz and Newton, who applied the infinitesimal calculus to the tangent line problem, thus permitting the evolution of that branch of modern mathematics. [141] His rule of signs is also a commonly used method to determine the number of positive and negative roots of a polynomial.
Download as PDF; Printable version; ... This is the list of things named after René Descartes (1596–1650), ... Descartes' rule of signs; Descartes snark;
For computing over the reals, Sturm's theorem is less efficient than other methods based on Descartes' rule of signs. However, it works on every real closed field, and, therefore, remains fundamental for the theoretical study of the computational complexity of decidability and quantifier elimination in the first order theory of real numbers.
Descartes justifies his omissions and obscurities with the remark that much was deliberately omitted "in order to give others the pleasure of discovering [it] for themselves." Descartes is often credited with inventing the coordinate plane because he had the relevant concepts in his book, [ 8 ] however, nowhere in La Géométrie does the modern ...
In algebra, the rational root theorem (or rational root test, rational zero theorem, rational zero test or p/q theorem) states a constraint on rational solutions of a polynomial equation + + + = with integer coefficients and ,.
Download as PDF; Printable version; In other projects ... Li discovered independently an equivalent version of what is known today as Descartes' rule of signs ...