The Lille Main Square
Aims and scope
The NorthWestern European Journal of Mathematics publishes research articles and surveys in all areas of pure and applied mathematics including history of mathematics. Articles can be submitted in Dutch, English, French or German.
Editorial Committee
Editor in Chief: Serge Nicaise
Associate Editors:
Universität der Bundeswehr München, Germany Numerical analysis for partial differential equations Karine Beauchard (*)
ENS Rennes, France Joachim von Below (*)
Université du Littoral Côte d'Opale, France Partial differential equations, operator theory, graph theory Christophe Biernacki (*)
Université de Lille 1, France Statistical, modelbased data analysis Claire ChainaisHillairet (*)
Université de Lille 1, France Numerical analysis for partial differential equations Walter Craig (*)
McMaster University, Canada Monique Dauge (*)
Rennes I, France Spectral theory, high order methods, singularities in partial differential equations Sinnou David (*)
Université Paris VI, France Arithmetic Youri Davydov (*)
Université de Lille 1, France Stochastic processes, limit theorems, stochastic geometry Pierre Dèbes (*)
Université de Lille 1, France Number theory, galois theory and arithmetic geometry JeanPierre Demailly (*)
Université de Grenoble 1, France Complex analytic and differential geometry, algebraic geometry, complex analysis Jérôme Droniou (*)
Monash University, Australia Elliptic and parabolic equations (theoretical and numerical study) Aziz El Kacimi (*)
Université de Valenciennes et du Hainaut Cambrésis, France Geometry, global analysis on manifolds Shalom Eliahou (*)
Université du Littoral Côte d'Opale, France Discrete mathematics Peter Fleischmann (*)
University of Kent, United Kingdom Algebra, group theory, representation theory, invariant theory Benoît Fresse (*)
Université de Lille 1, France Algebraic topology, operad theory Emmanuel Fricain (*)
Université de Lille 1, France Functional analysis, operator theory, complex analysis of one variable Eamonn Gaffney (*)
Oxford University, United Kingdom Applied mathematics in the life sciences and low Reynolds flows Antoine Gloria (*)
Université Libre de Bruxelles, Belgium Homogenization of partial differential equations Gilles Godefroy (*)
Université Paris VI, France Functional analysis Karl GrosseErdmann (*)
Université de Mons, Belgium Functional analysis, operator theory, linear dynamics BaoZhu Guo (*)
Academy of Mathematics and Systems Science, Academia Sinica, Beijing, China System control, partial differential equation, semigroup of linear operators Pascal Lambrechts (*)
Université Catholique de Louvain, Belgium Algebraic topology
Université d'Artois, France Functional analysis André Leroy (*)
Université d'Artois, France Non commutative ring theory, module theory, error correcting codes JeanJacques Loeb (*)
Université d'Angers, France Complex analysis, in particular when related to group theory Florian Luca (*)
University of Witwatersrand, Johannesburg, SouthAfrica Analytic and diophantine number theory Kaisa Matomäki (*)
University of Turku, Finland Analytic and combinatorial number theory Christian Michaux (*)
Université de Mons, Belgium Mathematical logic Ieke Moerdijk (*)
University of Utrecht, Netherlands Algebraic topology, category theory Alejandro Murua (*)
Université de Montréal, Canada Statistical learning, clustering, pattern recognition Hiroaki Nakamura (*)
Osaka University, Japan Arithmetic geometry Jan van Neerven (*)
Delft University of Technology, Netherlands Functional analysis, stochastic analysis Johannes Nicaise (*)
Katholieke Universiteit Leuven, Belgium Algebraic and arithmetic geometry Serge Nicaise (*)
Université de Valenciennes et du Hainaut Cambrésis, France Partial differential equations, numerical analysis, control theory Rimas Norvaisa (*)
Vilnius University, Lituany Probability theory and stochastic processes, nonlinear functional analysis Giovanni Peccati (*)
University of Luxembourg, Luxembourg Random fields, stochastic analysis, stochastic geometry, noncommutative probability Teimuraz Pirashvili (*)
University of Leicester, United Kingdom Homological algebra and polynomial functors Olivier Ramaré (*)
Université de Lille 1, France Analytic number theory Sylvie Roelly (*)
University of Potsdam, Germany Stochastic differential equations, statistical mechanics, branching processes Isar Stubbe (*)
Université du Littoral Côte d'Opale, France Category theory, order theory Charles Suquet (*)
Université de Lille 1, France Rossana Tazzioli (*)
Université de Lille 1, France History of mathematics JeanPierre Tignol (*)
Université Catholique de Louvain, Belgium Algebra Jie Wu (*)
Institut Élie Cartan, Nancy, France Analytic number theory and modular forms
Fields Editor: Walter Craig Managing Editor: Nicolas Wicker
Policies
Peer Review Process
The authors are asked to provide the names of one or two potential associate editors who will manage their article. Then, the editor in chief assigns the article to an associate editor who seeks reviewer(s). Once the reviews are available, the associate editor reports his decision to the whole editorial board which takes the final decision regarding the acceptance of the article.
Open Access Policy
No charges are levied on authors. Articles are freely available to anyone as soon they are accepted. Hard copies of a volume are available at the cost of the paper and delivery.
Copyright Notice
Authors keep their copyrights. Thus they can reuse figures, article parts or any material they need for subsequent work. The contract license is the Creative Commons License CCBY which is the most flexible contract maximising the readership on publication.
Author Guidelines
At this initial stage, the authors have only to provide a file in the pdf format. Only when the article is accepted or subject to minor revisions are they asked to ensure it complies with the journal format.
Here is the LaTEX class we use : nwejm, please also note that the bibliography must be provided as a .bib file in the biblatex format.
For the time being, articles should be sent by mail to the managing editor (nicolas.wickerNOSPAMATunivlille1.fr) or you can submit them online.
Current Volume:
The current volume is the volume of 2016, the first volume, of 2015, is being typeset using the new class, nwejmart.

In this paper iteration stable (STIT) tessellations of the $d$dimensional Euclidean space are considered. By a careful analysis of the capacity functional an alternative proof is given for the fact that STIT tessellations are mixing.

The invariant $\Theta$ is the simplest $3$manifold invariant defined by counting graph configurations. It is actually an invariant of rational homology $3$spheres $M$ equipped with a combing $X$ over the complement of a point, where a combing is a homotopy class of nowhere vanishing vector fields. The invariant $\Theta(M,X)$ is the sum of $6 \lambda(M)$ and $\frac{p_1(X)}{4}$, where $\lambda$ denotes the CassonWalker invariant, and $p_1$ is an invariant of combings, which is an extension of a first relative Pontrjagin class, and which is simply related to a Gompf invariant $\theta_G$. In Lescop (2015), we proved a combinatorial formula for the $\Theta$invariant in terms of decorated Heegaard diagrams. In this article, we study the variations of the invariants $p_1$ or $\theta_G$ when the decorations of the Heegaard diagrams that define the combings change, independently. Then we prove that the formula of Lescop (2015) defines an invariant of combed once punctured rational homology $3$spheres without referring to configuration spaces. Finally, we prove that this invariant is the sum of $6 \lambda(M)$ and $\frac{p_1(X)}{4}$ for integer homology $3$spheres, by proving surgery formulae both for the combinatorial invariant and for $p_1$.

We study an impartial avoidance game introduced by Anderson and Harary. The game is played by two players who alternately select previously unselected elements of a finite group. The first player who cannot select an element without making the set of jointlyselected elements into a generating set for the group loses the game. We develop criteria on the maximal subgroups that determine the nimnumbers of these games and use our criteria to study our game for several families of groups, including nilpotent, sporadic, and symmetric groups.

We study composition operators acting between $\mathcal{N}_p$spaces in the unit ball in $\mathbb{C}^n$. We obtain characterizations of the boundedness and compactness of $C_{\varphi}:\mathcal{N}_p\longrightarrow\mathcal{N}_q$ for $p, q>0$.

In 2002, Fatiha Alabau, Piermarco Cannarsa and Vilmos Komornik investigated the extent of asymptotic stability of the null solution for weakly coupled partially damped equations of the second order in time. The main point is that the damping operator acts only on the first component and, whenever it is bounded, the coupling is not strong enough to produce an exponential decay in the energy space associated to the conservative part of the system. As a consequence, for initial data in the energy space, the rate of decay is not exponential. Due to the nature of the result it seems at first sight impossible to obtain the asymptotic stability result by the classical Liapunov method. Surprisingly enough, this turns out to be possible and we exhibit, under some compatibility conditions on the operators, an explicit class of Liapunov functions which allows to do 3 different things: 1) When the problem is reduced to a stable finite dimensional space, we recover the exponential decay by a single differential inequality and we estimate the logarithmic decrement of the solutions with worst (slowest) decay. The estimate is optimal at least for some values of the parameters. 2) We explain the form of the stability result obtained by the previous authors when the coupling operator is a multiple of the identity, so that the decay is not exponential. 3) We obtain new exponential decay results when the coupling operator is strong enough (in particular unbounded). The estimate is again sharp for some solutions.
Acknowledgements
This journal owes much to the following persons: Denis Bitouzé for LaTex support, JeanJacques Derycke for printing service, Sébastien Huart for computer engineering issues and Aurore Smets for secretarial tasks.
Supports
The department of Mathematics of Lille 1 provides financial support which ensures that this journal stays open access. The French Mathematical Society (SMF), the Dutch Mathematical Society (KWG), the Luxembourg Mathematical Society (SML) and the Fields Institute support this project, of a mathematics journal by a nonprofit publisher, making research available free of charge for readers and authors.
Auxiliary Material
A slide to present the journal.