logics are logics which allow to deal with contradictions, or
to put it in a more technical manner, with contradictory yet
non-tivial theories The subject is a mathematical field surrounded
by philosophical discussions and with technological applications.
Following the WCP1
organized in Ghent (Belgium, 1997)
organized in Juquehy (Brazil, 2000)
WCP3 will take
place in Toulouse (France, 2003).
The organization of WCP3 in France celebrates the collaboration
between a French mathematician, Marcel Guillaume, and the originator
of paraconsistent logic, the Brazilian logician Newton da Costa.
Guillaume helped to disseminate da Costa's work, presenting
it to the famous Comptes Rendus de l'Académie des Sciences
de Paris at the beginning of the sixties. During more than ten
years da Costa and his collaborators have published numerous
notes on the advancement of their work in this prestigious scientific
a new generation of researchers in France and in several other
locations is interested in paraconsistent logic, working in
particular on its applications to computer science and artificial