Quote: an abstract data type is a class of modes that specifies the permissible operands for its operators; can use any member of the mode class

Quotation Skeleton

types as classes of modes … [are used] to specify in terms of types the … type to determine the set of permissible operator/operand … a data type deserves the name abstract only … the mode class [i.e., type] without distinguishing among them. … The language user should be able to group …   Google-1   Google-2

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Quote: a programming language should be able to group modes into abstract types almost arbitrarily

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