English

On the structure of linear-time reducibility

Computational Complexity 2007-05-23 v1

Abstract

In 1975, Ladner showed that under the hypothesis that P is not equal to NP, there exists a language which is neither in P, nor NP-complete. This result was latter generalized by Schoning and several authors to various polynomial-time complexity classes. We show here that such results also apply to linear-time reductions on RAMs (resp. Turing machines), and hence allow for separation results in linear-time classes similar to Ladner's ones for polynomial time.

Keywords

Cite

@article{arxiv.cs/0606080,
  title  = {On the structure of linear-time reducibility},
  author = {Philippe Chapdelaine},
  journal= {arXiv preprint arXiv:cs/0606080},
  year   = {2007}
}

Comments

10 pages

R2 v1 2026-07-22T12:25:58.436Z