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Electronic Colloquium on Computational Complexity

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All reports by Author Stephen Travers:

TR06-090 | 22nd June 2006
Christian Glaßer, Alan L. Selman, Stephen Travers, Liyu Zhang

Non-Mitotic Sets

<p> We study the question of the existence of non-mitotic sets in NP. We show under various hypotheses that:</p>
<li>1-tt-mitoticity and m-mitoticity differ on NP.</li>
<li>1-tt-reducibility and m-reducibility differ on NP.</li>
<li>There exist non-T-autoreducible sets in NP (by a result from Ambos-Spies, these sets are neither ... more >>>

TR06-069 | 11th May 2006
Christian Glaßer, Alan L. Selman, Stephen Travers, Klaus W. Wagner

The Complexity of Unions of Disjoint Sets

This paper is motivated by the open question
whether the union of two disjoint NP-complete sets always is
NP-complete. We discover that such unions retain
much of the complexity of their single components. More precisely,
they are complete with respect to more general reducibilities.

more >>>

TR05-147 | 5th December 2005
Christian Glaßer, Stephen Travers

Machines that can Output Empty Words

We propose the e-model for leaf languages which generalizes the known balanced and unbalanced concepts. Inspired by the neutral behavior of rejecting paths of NP machines, we allow transducers to output empty words.

The paper explains several advantages of the new model. A central aspect is that it allows us ... more >>>

TR05-035 | 24th March 2005
Christian Glaßer, Stephen Travers, Klaus W. Wagner

A Reducibility that Corresponds to Unbalanced Leaf-Language Classes

We introduce the polynomial-time tree reducibility
(ptt-reducibility). Our main result states that for
languages $B$ and $C$ it holds that
$B$ ptt-reduces to $C$ if and only if
the unbalanced leaf-language class of $B$ is robustly contained in
the unbalanced leaf-language class of $C$.
... more >>>

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