[DL] What is a Conditional? G.Gomes - LUW, Oct 14, 2026, 4pm CET

[jean-yves beziau]

The next session of the Logica Universalis Webinar will take place next
Wednesday, Oct 14 at 4pm CET (Paris, Geneva, Rome):

Speaker: Gilberto Gomes, Norte Fluminense State University, Brazil
Title:  What is a Conditional?
Abstract: This paper examines the nature of conditionals in thought,
natural language, and logic. It argues that conditionals are fundamentally
concerned with possibilities rather than merely with truth values, and
distinguishes several types of conditional according to the relation
between antecedent and consequent. Particular attention is given to
implicative and concessive conditionals. An implicative conditional is
characterized as one in which the antecedent is taken to imply the
consequent, whereas in a concessive conditional the consequent holds
despite the antecedent providing a reason for its falsity. A modal
definition of the implicative conditional is proposed according to which
the conjunction of the antecedent with the negation of the consequent is
impossible, while the contingency of both antecedent and consequent is
treated as a presupposition. This account is compared with material
implication, C.I.Lewis’s strict implication, and Pizzi’s consequential
implication. A logical definition is also proposed for the concessive
conditional according to which the antecedent is contingent, the consequent
necessary, and a new operator symbolizes the antecedent as a reason for the
falsity of the consequent. The paper also examines the negation of
conditionals and squares of opposition generated by relations among
implicative and concessive conditionals and their negation. Finally, it
briefly discusses three further types of non-implicative natural-language
conditionals and argues that logical systems should be assessed partly by
how adequately their conditional operators capture the relations of
implication and consequence found in natural reasoning.
https://link.springer.com/article/10.1007/s11787-026-00427-4

The above paper is the Gold medal of the Brazilian Philosophy Prize
https://sites.google.com/view/what-is-it/brazilian-prize
"Why establish the Brazilian Philosophy Prize and make Rio de Janeiro the
world capital of Philosophy?"
https://sites.google.com/view/what-is-it/philosophy-prize
This prize will be presented by JYB and Nythamar de Oliveira
https://www.pucrs.br/researchers/nythamar-hilario-fernandes-de-oliveira-junior/

Chair. Melvin Fitting,  Editorial Board LU
https://en.wikipedia.org/wiki/Melvin_Fitting

Everybody is welcome to join, register here on Cassyni (if not yet done):
https://cassyni.com/register
and access the session here:
https://cassyni.com/s/logica-universalis
The zoom link will be available 30mn before the start of the session on the
following page:
https://cassyni.com/events/DJLEFyz8dBhA4T7N9yM2Yu
>-----------------------------------------------------------------------------
Jean-Yves Beziau
Organizer of  the Logica Universalis Webinar
Founder and Editor-in-Chief Logica Universalis
https://www.jyb-logic.org/
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