Question: Is a composite relation can be empty, because i couldn't find any matches y with x. LivesIn = {(Alice, Boston),(Bob, Boston),(Carol, Chicago),(David, Dallas), (Evan, Chicago),(Francis,

Is a composite relation can be empty, because i couldn't find any matches y with x.

LivesIn = {(Alice, Boston),(Bob, Boston),(Carol, Chicago),(David, Dallas), (Evan, Chicago),(Francis, Atlanta),(Gabby, Dallas),(Hera, Chicago)}

ParentOf = {(Alice, Carol),(Bob, Carol),(Alice, David),(Bob, David), (Carol, Francis),(Evan, Francis),(David, Gabby),(Francis, Hera)}

LivesIn ParentOf =

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