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Z_, or equivalently
represents the set of integers.
The four basic sets are assigned to the identifiers
C_ during system initialization.
The set of positive integers, too, is assigned to the identifier
system initialization. It is not represented by a basic set but by
the intersection of
Z_ and the interval
The domain of basic sets know about the basic arithmetical and set-theoretic functions:
J:=Dom::Interval(3/2, 21/4): Z_ intersect J
contains— Test whether some object is a member
is(a in S) may be used.
convert— Convert a domain into a basic set
set2prop— Convert a set to a property