Two iteration theorems for some families
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L. Boasson
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Article
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1973
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Elsevier Science
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English
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Families of Languages," abbreviated full AFL's, were introduced by S. Ginsburg and S. Greibach in [I 1]. It is well known that the family of contextfree languages is a full AFL . It is also a rational cone (according to Eilenberg's terminology) . Let Dn\* (respectively, D~\*) be the Dyck language (r