[EM] Cancelling a vote in Approval

[Elisabeth Varin/Stephane Rouillon]

>From my point of view, the ability to deny someone else
representation is not a good thing. But it has no impact on single
seat elections where with only one winner, some voters are going
to be without representation at the end of the process.
I suppose that is why Mike says my views fit for multiple-winners
elections. And I tend to see single winner methods as a particular case of
multiple-winners elections... Maybe I should not.

Markus Schulze a écrit :

> 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

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