Julio,
Thanks for pointing out this inconsistency with standard definitions.
I think this was my mistake. Unless anyone objects, we will fix it. The
other definition is arguably as useful (or more so) and we will perhaps keep
it with a different name.
Sorry for the inconvenience this may have caused.
-s
On Mon, Oct 5, 2009 at 3:44 PM, Julio <madth3 at gmail.com> wrote:
>
> Well, I've always used that the symmetric difference of two sets is
> commutative and associative as a basis to define it for more than two sets.
> Let's say:
>
> sd(a_1, a_2, ... a_n) := sd(a_1, sd(a_2, ... a_n))
>
>
> http://planetmath.org/?op=getobj&from=objects&id=916
>
> http://en.wikipedia.org/wiki/Symmetric_difference
>
>
> --
> --------------------------------------------------------------------
> Julio Cesar Aguilar Cabrera
>
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