The Logic of Normative Justification

Öz

What really makes the concepts of obligation or permission so important for practical philosophy? What if we could find a better concept, one that, despite the simplicity, could show itself as intuitive and rich as possible? Could justifications be used in common language and practice as a sign of ethical judgment and as a strong motive for action? In most scenarios, for example, it really doesn’t matter if a given action is obliged, permitted or forbidden, one may perform the action as long as a justification for doing it is present. In this sense, the notion of justification seems to be more basic and powerful than other concepts used in the philosophical discourse. The existence of formal systems based on the epistemological side of justification, created by Artemov, led us primarily to think that justification could make the formal discourse much more accurate for ethics than the ones using deontological concepts. In the semantical and syntactical aspects, almost all of Artemov’s systems directly proved to be fruitful for ethical purposes. We also developed combinations between the standard deontic logic and logics of justification, resulting in what whe called the Logics of Normative Justification. These systems were able to change the object of the justification formulas and shed some light in ethics as a whole, normative and metaethics. Metaethics were a forgotten subject in formal ethics. We were also able to deal with some known problems in deontic logic, like the famous Ross’s paradox and the expressiveness of prima facie and all-things-considered obligations.

Anahtar Kelimeler

• Deontic logic,modality,justification,ethics,metaethics

Kaynakça

1. Anderson, Alan R. “Some nasty problems in the formal logic of ethics.” Noûs 4 (1967): 345–360.
2. Åqvist, Lennart. Introduction to deontic logic and the theory of normative systems. Naples: Bibliopolis, 1987.
3. Artemov, Sergei. “The logic of justification.” The Review of Symbolic Logic 4 (2008): 477–513.
4. Bealer, George. Quality and concept. New Haven: Yale University Press, 1982.
5. Blackburn, Patrick, Rijke, Martin and Venema, Yde. Modal logic. Cambridge: Cambridge University Press, 2002.
6. Branquinho, João, Murcho, Desidério and Gomes, Nelson G. Enciclopédia de termos lógico-filosóficos. São Paulo: Martins Fontes, 2006.
7. Carnielli, Walter and Pizzi, Carlos. Modalities and multimodalities. Berlin: Springer, 2008.
8. Carneiro, Gregory. “Lógica da Justificação Normativa: Interpretações e Aplicações Filosóficas.” Master dissertation, University of Brasília, 2019.

9. Chisholm, Roderick. Teoria do conhecimento. Rio de Janeiro: Zahar, 1974.
10. Chrisman, Matthew. What is this thing called Metaethics? London: Routledge, 2016.
11. Copp, David. The Oxford handbook of ethical theory. Oxford: Oxford University Press, 2006.
12. Costa-Leite, Alexandre. “Interactions of metaphysical and epistemic concepts.” PhD dissertation, University of Neuchatel, 2007.
13. Costa-Leite, Alexandre. “O problema das justificações parciais”. Revista de Filosofia Moderna e Contemporânea 6 (2018): 95–104. da
14. Costa, Newton. O conhecimento científico. Curitiba: Editora discurso editorial, 1997.
15. Dancy, Jonathan. “Nonnaturalism,” in The Oxford handbook of ethical theory, ed. David Coop, 122-145. Oxford: Oxford University Press, 2006.
16. Darwall, Stephen. “Morality and practical reason: A Kantian approach,” in The Oxford handbook of ethical theory, ed. David Coop, 282-320. Oxford: Oxford University Press, 2006..
17. Faroldi, Federico and Protopopescu, Tudor.“A hyperintensional logical framework for deontic reasons.” Logic Journal of the IGPL 27 (2019): 411-433.
18. Gabbay, Dov, Kurucz, A., Zakharyaschev, M. and Wolter, Frank. Many-dimensional modal logics: theory and applications. Amsterdam: Elsevier, 2003.
19. Gettier, Edmund L. “Is justified true belief knowledge?.” Analysis 23.6 (1963): 121-123.
20. Hare, Richard M. A linguagem da moral. São Paulo: Martins Fontes, 1996. Hume, David. Tratado da natureza humana. São Paulo: Unesp, 2009.
21. Jørgensen, Jørgen. “Imperatives and logic.” Erkenntnis 7 (1937): 288-296. Kant, Immanuel. Fundamentação da metafísica dos costumes. Lisbon: Edições 70, 1995.
22. Kracht, Marcus and Wolter, Frank. “Properties of independently axiomatizable bimodal logics.” Journal of Symbolic Logic 56 (1991): 1469–1485.
23. Kuznets, Roman. “Complexity Issues in Justification Logic.” PhD dissertation, City University New York, 2008.
24. Makinson, David. “On a fundamental problem of deontic logic.” Norms, Logics and Information Systems. New Studies on Deontic Logic and Computer Science (1999): 29–54.
25. Makinson, David and Torre, Leon van der. “Permission from an input/output perspective.” Journal of Philosophical Logic 32 (2003): 391–416.
26. Mcnamara, Paul. “Deontic logic,” The Stanford Encyclopedia of Philosophy, Stanford: Stanford University, 2014.
27. Plato. Teeteto. Lisbon: Calouste Gulbenkian, 2008. PRIEST, Graham. In contradiction. Oxford: Oxford University Press, 2006.
28. Rönnedal, Daniel. An introduction to deontic logic. Stockholm: CreateSpace, 2010. Rönnedal, Daniel. “Quantified temporal alethic-deontic logic,” Logic and Logical Philosophy 1 (2015): 19–59.
29. Ross, Alf. “Imperatives and logic”. Philosophy of Science 1 (1944):30–46.
30. Sinnott-Armstrong, W. “Moral skepticism”. The Stanford Encyclopedia of Philosophy. Stanford: Stanford University, 2015.
31. Vázquez, Adolfo S. Ética. Rio de Janeiro: Civilização Brasileira, 2013. Wright, Georg H. “Deontic logic.” Mind 237 (1951): 1–15.