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Electronic Colloquium on Computational Complexity

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TR03-030 | 27th February 2003
Amin Coja-Oghlan, Andreas Goerdt, André Lanka, Frank Schädlich

Certifying Unsatisfiability of Random 2k-SAT Formulas using Approximation Techniques

Abstract. It is known that random k-SAT formulas with at least
(2^k*ln2)*n random clauses are unsatisfiable with high probability. This
result is simply obtained by bounding the expected number of satisfy-
ing assignments of a random k-SAT instance by an expression tending
to 0 when n, the number of variables ... more >>>


TR03-029 | 1st April 2003
Philippe Moser

BPP has effective dimension at most 1/2 unless BPP=EXP

We prove that BPP has Lutz's p-dimension at most 1/2 unless BPP equals EXP.
Next we show that BPP has Lutz's p-dimension zero unless BPP equals EXP
on infinitely many input lengths.
We also prove that BPP has measure zero in the smaller complexity
class ... more >>>


TR03-028 | 28th February 2003
Olivier Powell

PSPACE contains almost complete problems

An almost complete set A for a complexity class C is a language of C which is not complete, but that has the property that ``many'' languages of C reduce to A, where the term ``many'' is used in reference to Lutz's resource bounded measure (rbm). The question of the ... more >>>



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