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Construction of Very Hard Functions for Multiparty Communication Complexity

Ján Maňuch — 2010

RAIRO - Theoretical Informatics and Applications

We consider the multiparty communication model defined in [4] using the formalism from [8]. First, we correct an inaccuracy in the proof of the fundamental result of [6] providing a lower bound on the nondeterministic communication complexity of a function. Then we construct several very hard functions, , functions such that those as well as their complements have the worst possible nondeterministic communication complexity. The problem to find a particular very hard function was proposed ...

On 𝖿 -wise arc forwarding index and wavelength allocations in faulty all-optical hypercubes

Ján MaňuchLadislav Stacho — 2003

RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications

Motivated by the wavelength division multiplexing in all-optical networks, we consider the problem of finding an optimal (with respect to the least possible number of wavelengths) set of f + 1 internally node disjoint dipaths connecting all pairs of distinct nodes in the binary r -dimensional hypercube, where 0 f < r . This system of dipaths constitutes a routing protocol that remains functional in the presence of up to f faults (of nodes and/or links). The problem of constructing such protocols for general...

On ƒ-wise Arc Forwarding Index and Wavelength Allocations in Faulty All-optical Hypercubes

Ján MaňuchLadislav Stacho — 2010

RAIRO - Theoretical Informatics and Applications

Motivated by the wavelength division multiplexing in all-optical networks, we consider the problem of finding an optimal (with respect to the least possible number of wavelengths) set of internally node disjoint dipaths connecting all pairs of distinct nodes in the binary -dimensional hypercube, where . This system of dipaths constitutes a routing protocol that remains functional in the presence of up to faults (of nodes and/or links). The problem of constructing such protocols for general...

On conjugacy of languages

Julien CassaigneJuhani KarhumäkiJán Maňuch — 2001

RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications

We say that two languages X and Y are conjugates if they satisfy the conjugacy equation X Z = Z Y for some language Z . We study several problems associated with this equation. For example, we characterize all sets which are conjugated v i a a two-element biprefix set Z , as well as all two-element sets which are conjugates.

On Conjugacy of Languages

Julien CassaigneJuhani KarhumäkiJán Maňuch — 2010

RAIRO - Theoretical Informatics and Applications

We say that two languages and are conjugates if they satisfy the for some language . We study several problems associated with this equation. For example, we characterize all sets which are conjugated a two-element biprefix set , as well as all two-element sets which are conjugates.

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