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  4. If R is a relation in a set A such that ( a , a ) ∈ R for every a ∈ A, then the relation R is called

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Q. If $R$ is a relation in a set $A$ such that $( a , a ) \in R$ for every $a \in A$, then the relation $R$ is called

Relations and Functions - Part 2

Solution:

A relation $R$ in a set A is called reflexive, if $( a , a ) \in R$ for every $a \in A$.