From Latin minus, neuter form of minor, comparative form of parvus (“small, little”), from the Proto-Indo-European root *mey- (“few, small”). enPR: mīn-əs, IPA(key): /ˈmaɪnəs/. Rhymes: -aɪnəs. minus. (mathematics)...
As sepp2k pointed out, the implementation of minus must assume ordered lists. Here goes a possible implementation: Minus :: Ord a => [a] -> [a] -> [a] minus  _ =  minus xs  = xs minus [email protected](x:xs) l2...