English

Short lists with short programs for functions

Logic 2014-11-05 v3

Abstract

Let {ϕp}\{\phi_p\} be an optimal G\"odel numbering of the family of computable functions (in Schnorr's sense), where pp ranges over binary strings. Assume that a list of strings L(p)L(p) is computable from pp and for all pp contains a ϕ\phi-program for ϕp\phi_p whose length is at most ε\varepsilon bits larger that the length of the shortest ϕ\phi-program for ϕp\phi_p. We show that for infinitely many pp the list L(p)L(p) must have 2pεO(1)2^{|p|-\varepsilon-O(1)} strings. Here ε\varepsilon is an arbitrary function of pp.

Cite

@article{arxiv.1409.5906,
  title  = {Short lists with short programs for functions},
  author = {Nikolay Vereshchagin},
  journal= {arXiv preprint arXiv:1409.5906},
  year   = {2014}
}
R2 v1 2026-06-22T06:01:34.760Z