What started as a very simple implementation of (a small subset of) Peano numbers, as an exercise in exploring rantly.
By adding inverses to the Peano numbers, we implement the group of integers under +.
A trampoline allows us to express the natural recursive definitions in constant space.
We violate standard OO doctrine and switch on types to concentrate the various algorithms each in one place.
Copyright (C) 2011-2013 by Frank Shearar
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