On Wed, Mar 25, 2015 at 8:55 AM, Shishir Srivastava <shishir.srivastava@gmail.com> wrote:

Hi,

Can someone please explain why this results in error -

[] `elem` [1,2,3]

Shouldn't the empty set by definition be the element of all sets including a non-empty set ?

Norbert gave you the information about Lists and Data.Set, but you're wrong about the properties of the empty set. The empty set is a SUBSET of all sets. But it's only a MEMBER of supersets of {{}}.