[EM] Definitions of "completion method" and "aggregate method"

[Colin Champion]

I don't think the terminology is settled, but it makes sense to use the 
term 'completion' for methods of the form "if M has a unique winner, 
elect that candidate, otherwise elect the winner of Mdash", whereas a 
tiebreak is limited in some way to the subset of candidates who tie 
under M. Condorcet cycles are not normally called ties, so Condorcet 
resolutions are called completions. It would be possible to have Llull 
completions, eg. elect the Llull winner if it is unique, else elect the 
Borda winner. Certainly Llull's method doesn't *require* a completion 
method in this sense, but it's an alternative to the two natural ways of 
breaking ties, and someone will one day prove that it has unique 
robustness to a certain form of tactical voting.

CJC

On 04/05/2022 15:00, Hahn, Paul wrote:
> I don't know of any methods besides Condorcet that result in Condorcet-style ties requiring a completion method.
>
> --pH
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