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Monic polynomial. In algebra, a monic polynomial is a non-zero univariate polynomial (that is, a polynomial in a single variable) in which the leading coefficient (the nonzero coefficient of highest degree) is equal to 1. That is to say, a monic polynomial is one that can be written as [1] with.
In elementary algebra, root rationalisation (or rationalization) is a process by which radicals in the denominator of an algebraic fraction are eliminated.. If the denominator is a monomial in some radical, say , with k < n, rationalisation consists of multiplying the numerator and the denominator by , and replacing by x (this is allowed, as, by definition, a n th root of x is a number that ...
Two definitions of a monomial may be encountered: A monomial, also called a power product or primitive monomial, [1] is a product of powers of variables with nonnegative integer exponents, or, in other words, a product of variables, possibly with repetitions. [2] For example, is a monomial. The constant is a primitive monomial, being equal to ...
Applied to the monic polynomial + = with all coefficients a k considered as free parameters, this means that every symmetric polynomial expression S(x 1,...,x n) in its roots can be expressed instead as a polynomial expression P(a 1,...,a n) in terms of its coefficients only, in other words without requiring knowledge of the roots.
Finding one root. The most widely used method for computing a root is Newton's method, which consists of the iterations of the computation of. + = ′ {\displaystyle x_ {n+1}=x_ {n}- {\frac {f (x_ {n})} {f' (x_ {n})}},} by starting from a well-chosen value. If f is a polynomial, the computation is faster when using Horner's method or evaluation ...
The degree of a monomial X α, frequently denoted deg α or | α |, is the sum of its exponents: deg α = ∑ i = 1 n α i . {\displaystyle \deg \alpha =\sum _{i=1}^{n}\alpha _{i}.} A polynomial in these indeterminates, with coefficients in a field K , or more generally a ring , is a finite linear combination of monomials
Gauss's lemma (polynomials) The greatest common divisor of the coefficients is a multiplicative function. In algebra, Gauss's lemma, [1] named after Carl Friedrich Gauss, is a theorem [note 1] about polynomials over the integers, or, more generally, over a unique factorization domain (that is, a ring that has a unique factorization property ...
When the number of zeros is finite, the Gröbner basis for a lexicographical monomial ordering provides, theoretically, a solution: the first coordinate of a solution is a root of the greatest common divisor of polynomials of the basis that depend only on the first variable. After substituting this root in the basis, the second coordinate of ...
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