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math.LO2013
Topological conjugations are not constructable
Linda Brown Westrick
We construct two computable topologically conjugate functions for which no conjugacy is computable, or even hyperarithmetic, resolving an open question of Kennedy and Stockman.
math.LO2013
A lightface analysis of the differentiability rank
Linda Brown Westrick
We examine the computable part of the differentiability hierarchy defined by Kechris and Woodin. In that hierarchy, the rank of a differentiable function is an ordinal less than om…