AnswerEX1-c

Relations

son of someone: {<x,y>|x is the son of y} = {<Tom,Paul>,<Tom,Alice>}

father of someone: {<x,y>|x is the father of y} ={<Paul,Tom>,<Paul,Lisa>}

daughter of someone: {<x,y>| x is the daughter of y} = {<Lisa,Paul>,<Lisa,Alice>}

mother of someone: {<x,y>| x is the mother of y} ={<Alice,Lisa>,<Alice,Paul>}

enjoy watching football games together: {<x,y>| x enjoys watching football with y and y enjoys

watching football with x} = {<Alice,Paul>,<Paul,Alice>,<Lisa,Alice>,<Alice,Lisa>,<Alice,Tom>,

<Tom,Alice>,<Paul,Lisa>,<Lisa,Paul>,<Paul,Tom>,<Tom,Paul>,<Tom,Lisa>,<Lisa,Tom>}

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