umfang (Leaf 5.1) == 1
flaeche (GeoNode 3 'a' (Leaf 17.5) (Leaf 1.8)) == 4 {- corr. -}

isWellFormed (Node 1 [(2,3),(2,5)] (Node 2 [(1,17)] (Nil))) == True
isWellFormed (Node 1 [(2,3),(2,5)] (Node 1 [(3,17)] (Nil))) == False

esGibtWeg (Node 1 [(2,3),(2,5)] (Node 2 [(1,17)] (Nil))) 1 2 2 == False
esGibtWeg (Node 1 [(2,3),(2,5)] (Node 2 [(1,17)] (Nil))) 1 2 (-5) == True

powMin3 "120" "2" == "100"
powMin3 "10" "2" == "0"