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I am stuck with a question. It is stated below.

Let $R$ be a relation defined on the set of integers $\mathbb Z$ by the rule $aRb \iff |a-b|\leq 2$. Write the relation $R$ as a set.

Now there can be too many sets that satisfy this relation. How do I write the set $R$ representing the relation?

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    I think the $A$ is supposed to mean the domain of $R$, and of course, the relation satisfies the rule $aRb \iff |a-b| \leq 2$. I will edit the question assuming this. Anyone knows what the tabular notation is? @fahad Please try to state your question more clearly, and using well-defined notation. Also typeset the math in latex.2011-07-31

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Given an integer $a$, the only integers $b$ which satisfy $|a-b|\le 2$ are $b=a-2,a-1,a,a+1,a+2$.

Thus the relation can be represented by the set $\{(n,n+k): n\in\mathbb{Z}, k\in\{-2,-1,0,1,2\}\}\subset\mathbb{Z}^2$.