The Primitive Recursive Functions appear quite attractive as a subset of all computable functions. They always terminate, so one can use an enumeration to get a computable upper bound on Kolmogorov complexity. They look like they are rich enough that the upper bound could be low enough to be interesting.
This is the bimonthly 'What are you working On?' thread. Previous threads are here. So here's the question:
What are you working on?
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