ABSTRACT
Elaborating upon an example used in the previous chapter, suppose the student has mastered the series of natural numbers and we now set him the task of constructing various numerical series; for example, starting with 0, we train him to produce a series by progressively adding 2 to each result. After a while we are satisfied that the student has mastered this procedure. Later, however, we ask him to pick up the series at 1000 and he continues in the following way:
1000, 1004, 1008, 1012
