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Monomial basis : ウィキペディア英語版
Monomial basis
In mathematics the monomial basis of a polynomial ring is its basis (as vector space or free module over the field or ring of coefficients) that consists in the set of all monomials. The monomials form a basis because every polynomial may be uniquely written as a finite linear combination of monomials (this is an immediate consequence of the definition of a polynomial).
==One indeterminate==

The polynomial ring of the univariate polynomial over a field is a -vector space, which has
:1,x,x^2,x^3, \ldots
as an (infinite) basis. More generally, if is a ring, is a free module, which has the same basis.
The polynomials of degree at most form also a vector space (or a free module in the case of a ring of coefficients), which has
:1,x,x^2,\ldots
as a basis
The canonical form of a polynomial is its expression on this basis:
:a_0 + a_1 x + a_2 x^2 + \ldots + a_d x^d,
or, using the shorter sigma notation:
:\sum_^d a_ix^i.
The monomial basis in naturally totally ordered, either by increasing degrees
:1
or by decreasing degrees
:1>x>x^2>\cdots.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Monomial basis」の詳細全文を読む



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