[Haskell-beginners] Empty list

[Max Voit]

Hi Shishir,

(in the following I'm ignoring the problem that lists have order and
elements may be in there multiple times) 

On Wed, 25 Mar 2015 13:55:11 +0000
Shishir Srivastava <shishir.srivastava at gmail.com> wrote:

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

This is not even true in the mathematical sense. True are:
	a) all power sets include the empty set as an *element*
	b) the empty set is a *subset* of all sets

For case (a) you'd need a list of lists since a powerset is a set of
sets.
For (b) `elem` is not the correct function.

Max