a) Das Bild von ${\displaystyle {}\{1,2,3\}}$ ist ${\displaystyle {}\{4,7\}}$.

b) Das Urbild von ${\displaystyle {}\{4,5,6,7\}}$ ist ${\displaystyle {}\{1,2,3,4\}}$.

c)

${\displaystyle {}x}$	${\displaystyle {}1}$	${\displaystyle {}2}$	${\displaystyle {}3}$	${\displaystyle {}4}$	${\displaystyle {}5}$	${\displaystyle {}6}$	${\displaystyle {}7}$
${\displaystyle {}\varphi (x)}$	${\displaystyle {}1}$	${\displaystyle {}7}$	${\displaystyle {}1}$	${\displaystyle {}4}$	${\displaystyle {}5}$	${\displaystyle {}5}$	${\displaystyle {}2}$