June 3, 2008
7:55 p.m.
On 3 Jun 2008, at 20:12, Mattias Engdegård wrote:
Arnaud Delobelle <arnodel@googlemail.com> writes:
A ^ (B ^ B) = A but (A ^ B) ^ B = A | B
No, symmetric set difference is associative.
Sorry, I don't know what came over me. It's obviously associative because an element is in the symmetric difference if it is in an odd numbers of sets. -- Arnaud