Marta MENGHINI
Dipartimento di Matematica
Università di Roma
Piazzale Aldo Moro
I-00185 Roma
I t a l y
menghini@mat.uniroma1.it

Alain MERCIER
Institut National de Recherche Pédagogique
Paris VII
F-75005 Paris
F r a n c e
mercier@univ-aix.fr

Philippe NABONNAND
Archives Henri Poincaré
Université de Nancy 2
23, Boulevard Albert 1er
BP 3397
F-54015 Nancy – Cédex
F r a n c e
nabonnan@isis.univ-nancy2.fr

Mogens NISS
IMFUFA
Roskilde University
P.O.Box 260
DK-4000 Roskilde
D e n m a r k
mn@mmf.ruc.dk

João Bosco PITOMBEIRA de Carvalho
Mathematics Department
Pontificia Univ. Cat.
Rua Marques de S. Vicente 225
Rio de Janeiro 22453-900
B r a z i l
jbpit@mat.puc-rio.br

*Douglas QUADLING
12, Archway Court
Barton Road
GB-Cambridge CBT 9LW
United Kingdom
Home tel.: +44-1223-357-216

Luís REIS
Centro de Competência Nónio Século XXI
Escola Superior de Biotecnologia
Universidade Católica Portuguesa
R. Dr. António Bernardino de Almeida
P-4200-072 Porto
P o r t u g a l
luisreis@esb.ucp.pt

André REVUZ
16, rue de Rome
F-78690 Les Essarts le Roi
F r a n c e
Home tel.: +33-(0)1-30-41-60-55

Nicolas ROUCHE
CREM
5, rue Emile Vandervelde
B-1400 Nivelles
B e l g i u m
rouche@amm.ucl.ac.be

Lee RUDOLPH
Department of Mathematics
Clark University
Worcester, MA 01610
U. S. A.
lrudolph@black.clarku.edu

Jean RUFFET
3, av. Théodore-Flournoy
CH-1207 Genève
S w i t z e r l a n d
Home tel.: +41-22-736.92.62

Gert SCHUBRING
Institut für Didaktik der Mathematik
Universität Bielefeld
Postfach 100 131
D-33501 Bielefeld
G e r m a n y
gert.schubring@uni-bielefeld.de