Summary

John Woldemar Cowan The Complete Lojban Language — Chapter 6 - To Speak Of Many Things… (1997)

In the case of mass and set descriptors, a single rule suffices for each: reference to a mass is implicitly a reference to some part of the mass; reference to a set is implicitly a reference to the whole set. Masses and sets are inherently singular objects: it makes no sense to talk about two distinct masses with the same components, or two distinct sets with the same members. Therefore, the largest possible outer quantifier for either a set description or a mass description is “piro”, the whole of it.
Source: Wikisource

John Woldemar Cowan The Complete Lojban Language — Chapter 6 - To Speak Of Many Things… (1997)

Here the same three persons are treated not as individuals, but as a so-called “mass entity”, or just “mass”. A mass has the properties of each individual which composes it, and may have other properties of its own as well. This can lead to apparent contradictions. Thus suppose in the piano-moving example above that person 1 has fair skin, whereas person 2 has dark skin. Then it is correct to say that the person-mass has both fair skin and dark skin.
Source: Wikisource

John Woldemar Cowan The Complete Lojban Language — Chapter 6 - To Speak Of Many Things… (1997)

There are a lot of rats. The mass of rats is small because at least one rat is small; the mass of rats is also large; the set of rats, though, is unquestionably large — it has billions of members. The mass of rats is also brown, since some of its components are; but it would be incorrect to call the set of rats brown — brown-ness is not the sort of property that sets possess.
Lojban speakers should generally think twice before employing the set descriptors. However, certain predicates have places that require set sumti to fill them.
Source: Wikisource

Get perspective with Kwize: daily news enlightened by great literature