Draw the directed graphs of the relations defined in 13-18.
Let and define a relation R on A as follows: For every .
To draw the directed graph of the relation defined on and define a relation R on A follows: For all
Let us determine all (positive) factors of each element in A :
holds when and thus when x is one of the factors of y (note that as 1 is not in A ).
Thus the relation R is then:
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