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The article seems to confuse RCV (voting by ranking a list of candidates) and IRV (a specific way of choosing the winner from such ballots). I'm not sure to whi
by singron 4y ago
The article seems to confuse RCV (voting by ranking a list of candidates) and IRV (a specific way of choosing the winner from such ballots). I'm not sure to which the law applies. Wikipedia has a disambiguation page for RCV that lists these 2 concepts.
There are ranked voting schemes that obey the summability criterion, although they aren't as commonly used as IRV and STV.
It's also quite practical to use a non-summable method with a limited set of candidates since any non-contrived method can use a summary array of length n! by using a count of each possible ranking. E.g. a large 10 candidate election could use only a 15MB summary array.