9 BINARY RELATIONS - tmarris.com
9 BINARY RELATIONS - tmarris.com
9 BINARY RELATIONS - tmarris.com
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
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.