292 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Eötvös Loránd UniversityHU16 papers
- Lund UniversitySE16 papers
- University of St AndrewsGB16 papers
- Austrian Academy of SciencesAT15 papers
- Centro de AstrobiologíaES15 papers
- Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)DE15 papers
- HUN-REN Research Centre for Astronomy and Earth SciencesHU15 papers
- Institut d'Astrophysique de ParisFR15 papers
- Institut d'Estudis Espacials de CatalunyaES15 papers
- Institute of Astrophysics and Space SciencesPT15 papers
- Instituto de Astrofísica de CanariasES15 papers
- Keele UniversityGB15 papers
7 papers · 1 filter
A modular characterization of supersolvable lattices
Stephan Foldes, Russ Woodroofe
We characterize supersolvable lattices in terms of a certain modular type relation. McNamara and Thomas earlier characterized this class of lattices as those graded lattices having…
Defining rough sets using tolerances compatible with an equivalence
Jouni Järvinen, László Kovács, Sándor Radeleczki
We consider tolerances compatible with an equivalence on , meaning that the relational product is included in . We present the essential properties of …
Representing regular pseudocomplemented Kleene algebras by tolerance-based rough sets
Jouni Järvinen, Sándor Radeleczki
We show that any regular pseudocomplemented Kleene algebra defined on an algebraic lattice is isomorphic to a rough set Kleene algebra determined by a tolerance induced by an irred…
Log-concavity of rows of Pascal type triangles
Stephan Foldes, Laszlo Major
Menon's proof of the preservation of log-concavity of sequences under convolution becomes simpler when adapted to 2-sided infinite sequences. Under assumption of log-concavity of t…
Interval decomposition lattices are balanced
S. Foldes, S. Radeleczki
Intervals in binary or n-ary relations or other discrete structures generalize the concept of interval in a linearly ordered set. Join-irreducible partitions into intervals are cha…
A general framework for island systems
Stephan Foldes, Eszter K. Horváth, Sándor Radeleczki +1
The notion of an island defined on a rectangular board is an elementary combinatorial concept that occurred first in [G. Czédli, The number of rectangular islands by means of distr…
A half-space approach to order dimension
Stephan Foldes, Jeno Szigeti
The aim of the present paper is to investigate the half-spaces in the convexity structure of all quasiorders on a given set and to use them in an alternative approach to classical…