## Ring Theory Hand Written Note

Here, We provided to Ring Theory Hand Written Note. In algebra, ring theory is the study of rings—algebraic structures in which addition and multiplication are defined and have similar properties to those operations defined for the integers. Ring theory studies the structure of rings, their representations, or, in a different language, modules, special classes of rings (group rings, division rings, universal enveloping algebras), as well as an array of properties that proved to be of interest both within the theory itself and for its applications, such as homological properties and polynomial identities.

Commutative rings are much better understood than noncommutative ones. Algebraic geometry and algebraic number theory, which provide many natural examples of commutative rings, have driven much of the development of commutative ring theory, which is now, under the name of commutative algebra, a major area of modern mathematics. Free download PDF Ring Theory Hand Written Note.

Because these three fields (algebraic geometry, algebraic number theory, and commutative algebra) are so intimately connected it is usually difficult and meaningless to decide which field a particular result belongs to. For example, Hilbert’s Nullstellensatz is a theorem which is fundamental for algebraic geometry and is stated and proved in terms of commutative algebra. Similarly, Fermat’s last theorem is stated in terms of elementary arithmetic, which is a part of commutative algebra, but its proof involves deep results of both algebraic number theory and algebraic geometry.

Noncommutative rings are quite different in flavor since more unusual behavior can arise. While the theory has developed in its own right, a fairly recent trend has sought to parallel the commutative development by building the theory of certain classes of noncommutative rings in a geometric fashion as if they were rings of functions on (non-existent) ‘noncommutative spaces’. This trend started in the 1980s with the development of noncommutative geometry and with the discovery of quantum groups. It has led to a better understanding of noncommutative rings, especially noncommutative Noetherian rings.

For the definitions of a ring and basic concepts and their properties, see the ring (mathematics). The definitions of terms used throughout ring theory may be found in the glossary of ring theory. Free download PDF Ring Theory Hand Written Note.

**BOOK INFO**

**BOOK NAME** – RING THEORY HAND WRITTEN NOTE

**AUTHOR** – DIPS ACADEMY

**SIZE** – 2.88MB

**PAGES** – 117

In-ring theory, a branch of abstract algebra, an ideal is a special subset of a ring. Ideals generalize certain subsets of the integers, such as the even numbers or the multiples of 3. The addition and subtraction of even numbers preserve evenness, and multiplying an even number by any other integer results in another even number; these closure and absorption properties are the defining properties of an ideal. An ideal can be used to construct a quotient ring similar to the way that, in group theory, a normal subgroup can be used to construct a quotient group. Free download PDF Ring Theory Hand Written Note.

Among the integers, the ideals correspond one-for-one with the non-negative integers: in this ring, every ideal is a principal ideal consisting of the multiples of a single non-negative number. However, in other rings, the ideals may be distinct from the ring elements, and certain properties of integers, when generalized to rings, attach more naturally to the ideals than to the elements of the ring. For instance, the prime ideals of a ring are analogous to prime numbers, and the Chinese remainder theorem can be generalized to ideals. There is a version of unique prime factorization for the ideals of a Dedekind domain (a type of ring important in number theory).

The related, but distinct, concept of an ideal in order theory is derived from the notion of the ideal in ring theory. A fractional ideal is a generalization of an idea, and the usual ideals are sometimes called integral ideals for clarity. Free download PDF Ring Theory Hand Written Note.

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