Bestimme, ob die durch die Relationstabelle

${\displaystyle {}\,}$	${\displaystyle {}A}$	${\displaystyle {}B}$	${\displaystyle {}C}$	${\displaystyle {}D}$
${\displaystyle {}A}$	${\displaystyle {}\,}$	${\displaystyle {}\,}$	${\displaystyle {}\,}$	${\displaystyle {}\,}$
${\displaystyle {}B}$	${\displaystyle {}\,}$	${\displaystyle {}\times }$	${\displaystyle {}\,}$	${\displaystyle {}\times }$
${\displaystyle {}C}$	${\displaystyle {}\,}$	${\displaystyle {}\,}$	${\displaystyle {}\times }$	${\displaystyle {}\,}$
${\displaystyle {}D}$	${\displaystyle {}\,}$	${\displaystyle {}\times }$	${\displaystyle {}\,}$	${\displaystyle {}\times }$

beschriebene Relation ${\displaystyle {}R}$ auf der Menge ${\displaystyle {}\{A,B,C,D\}}$ reflexiv, symmetrisch, transitiv, antisymmetrisch