## reflexive property

### a shared side or angle; angle C in the figure

The reflexive property is a fundamental concept in mathematics that applies to relations and equality. It is a property that states that every element of a set is related or equal to itself.

Let’s consider the formal definition of the reflexive property:

In mathematics, for a relation R on a set A to be reflexive, the following condition must hold true:

For every element a in set A, (a, a) is an element of relation R.

In simpler terms, this means that every element in a set is related to itself under a given relation. It implies that every element has a connection or relationship with itself.

To illustrate the reflexive property, let’s take the following relation on the set of real numbers:

R = {(x, x) | x is a real number}

In this case, for any real number x, (x, x) is an element of relation R. For example, (2, 2), (-3, -3), and (0, 0) are all elements of relation R, as they satisfy the condition of relating each number with itself.

The reflexive property is often used in various branches of mathematics, such as set theory, algebra, and geometry. It provides a foundation for reasoning, proofs, and defining other important properties like symmetric and transitive properties.

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