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9 BINARY RELATIONS - tmarris.com

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49.4 SOURCE AND TARGETLook at the binary relation { 1 å a, 2 å b, 3 å c }. We can see thatdom { 1 å a, 2 å b, 3 å c } = { 1, 2, 3 }and{ 1, 2, 3 } z ZZ is known as the source. The domain of a binary relation is a subset of its source.Now we define CHARACTER - the set of all characters of the alphabet:[ CHARACTER ]We can see thatran { 1 å a, 2 å b, 3 å c } = { a, b, c }and{ a, b, c } z CHARACTERCHARACTER is known as the target. The range of a binary relation is a subset of its target.

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