Séminaire Lotharingien de Combinatoire

This issue is devoted to our dear Lotharingien PIERRE LEROUX whose untimely death on 9 March 2008 was a shock for all of us. It contains invited papers by friends and co-workers of his. |

- [B61Aa] Nantel Bergeron, Christophe Hohlweg, Carsten Lange and Hugh Thomas
*Isometry Classes of Generalized Associahedra*(13 pp.)

- [B61Ab] Bruce E. Sagan
*Probabilistic Proofs of Hook Length Formulas Involving Trees*(10 pp.)

- [B61Ac] Sylvain Lavallée and Christophe Reutenauer
*Characteristic Polynomials of Nonnegative Integral Square Matrices and Clique Polynomials*(11 pp.)

- [B61Ad] Alan D. Sokal
*A Ridiculously Simple and Explicit Implicit Function Theorem*(21 pp.)

- [B61Ae] Alexander D. Scott and Alan D. Sokal
*Some Variants of the Exponential Formula, with Application to the Multivariate Tutte Polynomial (alias Potts Model)*(33 pp.)

- [B61Af] Amel Kaouche and Pierre Leroux
*Mayer and Ree-Hoover Weights of Infinite Families of 2-Connected Graphs*(28 pp.)

- [B61Ag] Gilbert Labelle and Cédric Lamathe
*General Combinatorial Differential Operators*(24 pp.)

- [B61Ah] Nicolas Bonichon, Mireille Bousquet-Mélou and Éric Fusy
*Baxter Permutations and Plane Bipolar Orientations*(29 pp.)

- [B61Ai] Alain Lascoux
*Generalization of Scott's Permanent Identity*(6 pp.)

- [B61Aj] Nantel Bergeron and Philippe Choquette
*Hyperoctahedral Species*(22 pp.)

- [B61Ak] Riccardo Biagioli and Jiang Zeng
*On Some Analogues of Descent Numbers and Major Index for the Hyperoctahedral Group*(13 pp.)

- [B61Al] Luca Ferrari and Pierre Leroux
*ECO Species*(23 pp.)

- [B61Am] Peter J. Cameron, Christian Krattenthaler and Thomas W. Müller
*Decomposable Functors and the Exponential Principle, II*(38 pp.)

- [B61An] William G. Faris (
**Semi-expository paper**) *Combinatorial Species and Feynman Diagrams*(37 pp.)