ECCC
2011
12 years 8 months ago
2011
We show that two complexity classes introduced about two decades ago are equal. ReachUL is the class of problems decided by nondeterministic log-space machines which on every inpu...
JSC
2010
13 years 3 months ago
2010
In this primarily expository article, I describe geometric approaches to variants of P v. NP, present several results that illustrate the role of group actions in complexity theory...
CORR
2007
Springer
13 years 4 months ago
2007
Springer
We investigate the following question: if a polynomial can be evaluated at rational points by a polynomial-time boolean algorithm, does it have a polynomial-size arithmetic circuit...
IANDC
2008
13 years 4 months ago
2008
We introduce two resource-bounded Baire category notions on small complexity classes such as P, QUASIPOLY, SUBEXP and PSPACE and on probabilistic classes such as BPP, which differ...
APAL
2006
13 years 4 months ago
2006
We investigate the question of whether one can characterize complexity classes (such as PSPACE or NEXP) in terms of efficient reducibility to the set of Kolmogorovrandom strings R...
AMAST
2006
Springer
13 years 8 months ago
2006
Springer
We propose two characterizations of complexity classes by means of programming languages. The first concerns Logspace while the second leads to Ptime. This latter characterization ...
MFCS
1989
Springer
13 years 8 months ago
1989
Springer
In this paper we review the key results about space bounded complexity classes, discuss the central open problems and outline the prominent proof techniques. We show that, for a s...
COCO
1990
Springer
13 years 8 months ago
1990
Springer
d Abstract) Eric Allender Christopher Wilson Department of Computer Science Department of Computer Rutgers University and Information Science New Brunswick, NJ 08903, USA Universit...
STACS
1993
Springer
13 years 8 months ago
1993
Springer
We show that for most complexity classes of interest, all sets complete under rstorder projections (fops) are isomorphic under rst-order isomorphisms. That is, a very restricted v...
PODS
1994
ACM
13 years 8 months ago
1994
ACM
Traditionally, computational complexity has considered only static problems. Classical Complexity Classes such as NC, P, and NP are de ned in terms of the complexity of checking {...