Time-bounded incompressibility of compressible strings and sequences

For every total recursive time bound t, a constant fraction of all compressible (low Kolmogorov complexity) strings is t-bounded incompressible (high time-bounded Kolmogorov complexity); there are uncountably many infinite sequences of which every initial segment of length n is compressible to log n...

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Veröffentlicht in:Information processing letters 2009-08, Vol.109 (18), p.1055-1059
Hauptverfasser: Daylight, Edgar G., Koolen, Wouter M., Vitányi, Paul M.B.
Format: Artikel
Sprache:eng
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Zusammenfassung:For every total recursive time bound t, a constant fraction of all compressible (low Kolmogorov complexity) strings is t-bounded incompressible (high time-bounded Kolmogorov complexity); there are uncountably many infinite sequences of which every initial segment of length n is compressible to log n yet t-bounded incompressible below 1 4 n − log n ; and there is a countably infinite number of recursive infinite sequences of which every initial segment is similarly t-bounded incompressible. These results and their proofs are related to, but different from, Barzdins's lemma.
ISSN:0020-0190
1872-6119
DOI:10.1016/j.ipl.2009.06.013