Chapter 18: lojbau mekso: Mathematical Expressions in Lojban
mei x1 is a mass formed from a set x2
of n members, one or more of which is/are x3,
[measured relative to the set x4/by standard x4]
rafsi: mem, mei
moi x1 is the (n)th member of set x2
when ordered by rule x3 [by standard x4]
rafsi: mom, moi
si'e x1 is an (n)th portion of mass x2
[by standard x3]
rafsi: none
cu'o event x1 has probability (n) of occurring
under conditions x2 [by standard x3]
rafsi: cu'o (borrowed from cunso; see c18-§20)