116 citations
- Centre National de la Recherche ScientifiqueFR31 papers
- Université Grenoble AlpesFR30 papers
- Université Joseph FourierFR18 papers
- Université Pierre Mendès FranceFR8 papers
- Institut de PhysiqueFR6 papers
- Laboratoire de Mathématiques d'OrsayFR5 papers
- Gesellschaft Fur Mathematik Und DatenverarbeitungDE4 papers
- Institut de Mathématiques de Jussieu-Paris Rive GaucheFR4 papers
- Ruhr University BochumDE4 papers
- Institut Camille JordanFR3 papers
- Laboratoire de Mathématiques Jean LerayFR3 papers
- University of GeorgiaUS3 papers
4 papers · 2 filters
Drawing disconnected graphs on the Klein bottle
Laurent Beaudou, Antoine Gerbaud, Roland Grappe +1
We prove that two disjoint graphs must always be drawn separately on the Klein bottle, in order to minimize the crossing number of the whole drawing.
On polytopes associated to factorisations of prime-powers
Roland Bacher
We study polytopes associated to factorisations of prime powers. These polytopes have explicit descriptions either in terms of their vertices or as intersections of closed halfspac…
On a family of tridiagonal matrices
Roland Bacher
We show that certain integral positive definite symmetric tridiagonal matrices of determinant are in one to one correspondence with elements of . We s…
The special subgroup of invertible non-commutative rational power series as a metric group
Roland Bacher
We give an easy proof of Schützenberger's Theorem stating that non-commutative formal power series are rational if and only if they are recognisable. A byproduct of this proof is a…