Permutations—in which ALICE is transformed
John Baylis, Rod Haggarty · 1988
This chapter departs from the main stream in having nothing ostensibly to do with numbers. So, if your main concern is understanding the number system, you lose nothing by skipping this chapter. If at some stage (and exactly which stage doesn’t really matter) you tackle it, we hope you will gain from it an appreciation that many of the concepts discussed in the main stream with reference to numbers are really of much wider applicability. The concepts we have in mind are factorisation, uniqueness, well-defined and equivalence classes.