Abstract
A Popper function is one that gives a conditional probability of propositional formulae. This paper gives a finite set of axioms that defines the set of Popper functions in many-sorted monadic second-order logic, and proves the decidability of the validity problem for a practically important first-order fragment of the second-order language with respect to a set of Popper functions. Upon these logical foundations, we propose, with results on their time complexity, two algorithms that compute the range of values that designated conditional probabilities can take under given constraints.
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Notes
- 1.
The numbers are just randomly chosen for the sake of a concrete example.
- 2.
In this sequent calculus, the probability is assigned to a sequent but it can be proved equal to that of the corresponding material implication.
- 3.
- 4.
However, our theorems and algorithms may apply to other cases, including those of \(P(A|B)=1\) or 0 for \(P(B)=0\).
- 5.
For translation \(T_1\), we use the fact that, for any propositional formula x in \(\mathscr {L}\), its corresponding equivalence class [x] in the Lindenbaum-Tarski algebra \(\mathbb {L}\) can be calculated.
- 6.
- 7.
This condition does not restrict the range of constraints \(\chi _1,\ldots ,\chi _n\) in practice, since our language now contains the constant symbols for all real numbers.
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Acknowledgements
The author would like to thank sincerely Takashi Maruyama, Takeshi Tsukada, Shun’ichi Yokoyama, Eiji Yumoto and Itaru Hosomi for discussion and many helpful comments. Thanks are also due to all anonymous referees who gave valuable comments on earlier versions of this article.
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Motoura, S. (2021). A Logic and Computation for Popper’s Conditional Probabilities. In: Vejnarová, J., Wilson, N. (eds) Symbolic and Quantitative Approaches to Reasoning with Uncertainty. ECSQARU 2021. Lecture Notes in Computer Science(), vol 12897. Springer, Cham. https://doi.org/10.1007/978-3-030-86772-0_47
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