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  1. Ideal (ring theory) - Wikipedia

    • In a ring R, the set R itself forms a two-sided ideal of R called the unit ideal. It is often also denoted by () since it is precisely the two-sided ideal generated (see below) by the unity ⁠ ⁠. See more

    Overview

    In mathematics, and more specifically in ring theory, an ideal of a ring is a special subset of its elements. Ideals … See more

    History

    Ernst Kummer invented the concept of ideal numbers to serve as the "missing" factors in number rings in which unique factorization fails; here the word "ideal" is in the sense of existing in imagination only, in analogy with "ideal" obje… See more

    Definitions

    Given a ring R, a left ideal is a subset I of R that is a subgroup of the additive group of that "absorbs multiplication from the left by elements of ⁠⁠"; that is, is a left ideal if it satisfies the following two conditions:
    1. … See more

    Examples and properties

    (For the sake of brevity, some results are stated only for left ideals but are usually also true for right ideals with appropriate notation changes.)
    • In a ring R, the set R itself forms a two-sided ideal … See more

    Types of ideals

    To simplify the description all rings are assumed to be commutative. The non-commutative case is discussed in detail in the respective articles.
    Ideals are important because they appear as kernels … See more

    Ideal operations

    The sum and product of ideals are defined as follows. For and ⁠⁠, left (resp. right) ideals of a ring R, their sum is
    ,
    which is a left (resp. right) ideal, and, if are two-sided, … See more

     
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  2. An ideal that is simultaneously a left ideal and a right ideal (that is, one that is preserved under multiplication by elements of $ A $) is said to be two-sided. These three concepts coincide in the commutative case.
    encyclopediaofmath.org/wiki/Ideal
    The term two-sided ideal is used in noncommutative rings to denote a subset that is both a right ideal and a left ideal. In commutative rings, where right and left are equivalent, a two-sided ideal is simply called "the" ideal.
    mathworld.wolfram.com/Two-SidedIdeal.html
    A two-sided ideal is a left ideal that is also a right ideal, and is sometimes simply called an ideal. In the language of modules, the definitions mean that a left (resp. right, two-sided) ideal of is an - submodule of when is viewed as a left (resp. right, bi-) -module.
    en.wikipedia.org/wiki/Ideal_(ring_theory)
     
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