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--bug fix TTT Nov 11 1992. (add convert $ to Symbol)
)abbrev domain SAOS SingletonAsOrderedSet
++ This trivial domain lets us build Univariate Polynomials
++ in an anonymous variable
SingletonAsOrderedSet(): Join(OrderedSet,ConvertibleTo Symbol) with
create:() -> %
== add
create() == "?" pretend %
a<b == false -- only one element
coerce(a) == outputForm "?" -- CJW doesn't like this: change ?
a=b == true -- only one element
min(a,b) == a -- only one element
max(a,b) == a -- only one element
convert a == coerce("?")
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