## Identity Axiom

### There exists an element e in G called an identity of G such that for all a in G we have that ae=ea=a

The identity axiom is a fundamental concept in mathematics and refers to the property that there exists an element in a set that does not change the value of any other element when it is combined with them under a certain operation. This element is called the identity element, and the axiom states that every set with an associative binary operation has an identity element.

More formally, let S be a set and let * be an associative binary operation on S. Then, there exists an element e in S such that for every element a in S, a * e = e * a = a. The element e is called the identity element of the set S with respect to the binary operation *.

For example, in the set of real numbers with the operation of addition, the identity element is 0, since adding 0 to any real number does not change its value. Similarly, in the set of real numbers with the operation of multiplication, the identity element is 1, since multiplying any real number by 1 does not change its value.

The identity axiom is a fundamental property in the study of algebraic structures such as groups, rings, and fields. In these structures, the identity element is often denoted by the symbol e or 1, and it plays a crucial role in defining inverse elements and proving other important properties of the structure.

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