# System under matrix addition (+) and matrix multiplication (.) is a field

• sam_0017
In summary, a field is a mathematical structure that follows certain properties such as closure, associativity, commutativity, distributivity, existence of identity elements, and existence of inverse elements. In the context of matrix addition and multiplication, a field is a set of matrices that satisfies all these properties. To determine if a set of matrices is a field, we need to check if it satisfies all the properties. In a field, matrix addition involves adding two matrices of the same dimensions, while matrix multiplication involves multiplying two matrices of compatible dimensions. The concept of a field has various practical applications in computer graphics, engineering, and cryptography. A set of matrices cannot be considered a field if it does not satisfy all the properties, but it may still
sam_0017

## Homework Statement

true or false ..
The system {S,+,.} with S = { matrix (a,b,a-b,a)|a,b ∊ R)
is not a field under matrix addition (+) and matrix multiplication (.)

i find that the statement is false .
since : 1. {S,+} is Abelian group.
2. {S,.} : is Abelian group.

is my finding is true ?

i think you should post this in the math section

## 1. What is a field in the context of matrix addition and multiplication?

A field is a mathematical structure that satisfies certain properties such as closure, associativity, commutativity, distributivity, existence of identity elements, and existence of inverse elements. In the context of matrix addition and multiplication, a field is a set of matrices that follows these properties.

## 2. How do you determine if a set of matrices is a field?

To determine if a set of matrices is a field, we need to check if it satisfies all the properties of a field. This includes checking if the set is closed under addition and multiplication, if the operations are associative, commutative, and distributive, if there exist identity elements, and if every element has an inverse. If all these properties hold, then the set of matrices is a field.

## 3. What is the difference between matrix addition and multiplication in a field?

In a field, matrix addition is defined as adding two matrices of the same dimensions by adding their corresponding entries. On the other hand, matrix multiplication is defined as multiplying two matrices of compatible dimensions by performing dot products of rows and columns. Additionally, while matrix addition is commutative, matrix multiplication is not always commutative in a field.

## 4. How does the concept of a field apply to practical applications?

The concept of a field is used in various practical applications such as computer graphics, engineering, and cryptography. In computer graphics, fields are used to represent transformations and manipulations of images. In engineering, fields are used to model physical phenomena such as electric and magnetic fields. In cryptography, fields are used to create secure encryption algorithms.

## 5. Can a set of matrices be a field if it does not satisfy all the properties?

No, in order for a set of matrices to be considered a field, it must satisfy all the properties of a field. If even one property is not satisfied, then the set cannot be considered a field. However, a set of matrices that satisfies some, but not all, of the properties may still have useful applications in mathematics or other fields of study.

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