[Python-ideas] Support multiplication for sets

[Paul Moore]

On 7 October 2011 18:15, Stephen J. Turnbull <turnbull at sk.tsukuba.ac.jp> wrote:
> Paul Moore writes:
>
>  > So your multiplication isn't commutative (the types of the elements in
>  > the 2 expressions above are different).
>
> No, set multiplication is not going to be commutative: {'a'} X {1} is
> quite different from {1} X {'a'}.  The problem you're pointing out is
> much worse: the obvious implementation of Cartesian product isn't even
> associative.

Bah. For all my claims of having a mathematical background (OK, so it
was 30 years ago :-)) I can't even remember the difference between
associativity and commutativity.

I'm going for a lie down now... :-)
Paul.