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In every problem but the last one, you must use the successor function (s) and/or the...

In every problem but the last one, you must use the successor function (s) and/or the predecessor function (pr) when working with natural numbers in order to have a chance at receiving full credit

  1. Give a recursive definition of the relation FOURLESS on the natural numbers, where FOURLESS = ({x,y) ∈ N x N | x = y – 4}. (15 points)

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