Posted by Toby Inkster on 10/04/61 11:44

Davémon wrote:

> Lists with no items? That doesn't make any sense to me at all!

The mathematical equivalent for the UL element would be what is called a
"set".

A set is a group of numbers/shapes/letters/vectors/whatever. Some examples
are the set of all positive integers, the set of letters that directly
follow vowels in the alphabet, and the set of all people called Kevin.

The set is an abstract concept, and can be dealt with mathematically, in
many cases without worrying about how many (if any) elements it contains.

--
Toby A Inkster BSc (Hons) ARCS
Contact Me ~ http://tobyinkster.co.uk/contact

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