Quote: spec-types have different representations but the same set of operators; operators are generic

Quotation Skeleton

Spec-Types … For any mode defined by a representation and … on the representation using only the operators provided. … [ref]. … The set of modes that satisfies a given … operate on variables of a spec-type and that … specification will be correct for another variable of … be needed, but the program text need not …   Google-1   Google-2

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Additional Titles

Quote: if can prove a program correct according to its specifications, can then replace spec-types with other variables of the same type, but different modes

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