Abstract : Solovay proved that there exists a computable upper bound f of the prefix-free Kolmogorov complexity function K such that f (x) = K(x) for infinitely many x. In this paper, we consider the class of computable functions f such that K(x) ≤ f (x)+O(1) for all x and f (x) ≤ K(x) + O(1) for infinitely many x, which we call Solovay functions. We show that Solovay functions present interesting connections with randomness notions such as Martin-Löf randomness and K-triviality.
https://hal.inria.fr/inria-00359056 Contributor : Publications LoriaConnect in order to contact the contributor Submitted on : Thursday, February 5, 2009 - 2:27:58 PM Last modification on : Monday, January 18, 2021 - 11:50:32 AM Long-term archiving on: : Tuesday, June 8, 2010 - 8:14:03 PM