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Let R be the relation on Z defined by R ...

Let R be the relation on Z defined by R = { ( a,b): a,b `in` Z, a - b is an integer}. Find the domain and range of R

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`Z` is the set of integers
`therefore Z` is closed for subtraction.
That is for any two integer `a, b dotZ,(a-b) in Z`
`therefore` Range `=Z` and `cdot` Domain `=Z`.
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