This happens if the problem is " well-conditioned ", meaning that the solution changes by only a small amount if the problem data are changed by a small amount.
2.
The paper then distinguishes between structural recursion, where the related data definition happens to be self-referential, requiring usually a straightforward design process, and generative recursion, where new problem data is generated in the middle of the problem-solving process and the problem solving method is re-used, often requiring " ad hoc " mathematical insight, and stresses how this distinction makes their approach scalable to the object-oriented ( OO ) world.
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