[batch8] is there a need for any of these functions?

[Dimitrios Efthymiou]

getUnion(Set<ANumber> other)
getIntersection(Set<ANumber> other)
getDifference(Set<ANumber> other)
getSymmetricDifference(Set other)
isSubset(Set other)
isProperSubset(Set other)
getTruthSetFor(Predicate<ANumber> filterToApply)
getSizeOfPowerset()
getPowerset()
isDisjointTo(Set other)
getComplementRelativeTo(Set other)
getCardinality()
getMinimum()
getMaximum()
isBounded()
getNumberOfSubsetsTheSetHas()
getNumberOfDerangements()


multiset functions