A retract [as defined by Scott] is a continuous function f:D->D … . Thus, we may consider as the data … with these subdomains as their ranges. … thus, the data types of a universal domain …
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Quote: a type retract is a continuous function which is the identity over its range (a proper subspace of D)
Quote: a data type of the universal domain is the type retract for a proper subdomain of the universal domain