... language those implementations are themselves formulated in. V ABSTRACT CONTROL STRUCTURES AS FUNCTIONAL HIERARCHIES The control structure indicators the words IF, THEN, ELSE, the semi-colons, ... ABSTRACT CONTROL STRUCTURES AND THE SEMANTICS OF QUANTIFIERS Steven Cushing Computer ~ Science Department ... general, we can identify a control structure with such a functional hierarchy. For some background discussion relevant to this notion, see Hamilton and Zeldin (1976). A control structure can be...