Know how to use "fewer" and "less"? Find out.
In domain theory, a predicate P : D -> Bool is inclusive iff
For any chain C, a subset of D, and for all c in C, P(c) => P(lub C)
In other words, if the predicate holds for all elements of an increasing sequence then it holds for their least upper bound.
("lub is written in LaTeX as \sqcup).