Re: Questioning the defintions of set and element.

Mark a écrit :
"Martin Wanvik" <martinw@xxxxxxxxxxxx> wrote in message news:15978560.1209647023542.JavaMail.jakarta@xxxxxxxxxxxxxxxxxxxxxxxxx
Hi, most definitions of element and set I have come
across, say something
like,

An element is any object of our perception or of our
thought.
A set is a collection of unique elements.

So whats a collection?
Wolfram says it's a multiset.
Wiki says it's a multiset.

So whats a multiset?
[...]
You might find the following wikipedia articles helpful:

http://en.wikipedia.org/wiki/Naive_set_theory
http://en.wikipedia.org/wiki/Axiomatic_set_theory

-- Martin Wanvik

I've read the articles, but they do not define what a collection is. The wiki article for collection redirects to multiset.


Have you read the word "undefined" in David Ullrich anwer?
.

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