[EM] Cancelling a vote in Approval

[Markus Schulze]

Dear Steph,

you wrote (8 Dec 2002):
> I suppose Mike means that if someone voted ABDEFH,
> is vote can be cancelled by someone else voting CG
> thus the combined effect of those two votes has no
> effect on the outcome of the vote (except in the case
> of a tie and a mathematically systematical tie-breaker).

I suppose that Mike means something like Donald G. Saari's
"Reversal Symmetry Criterion" which says that adding a
vote and its reversal shouldn't change the outcome.
However, this criterion is a rather strong criterion
(especially when one promotes "winning votes").

Markus Schulze

----
For more information about this list (subscribe, unsubscribe, FAQ, etc), 
please see http://www.eskimo.com/~robla/em