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High-Impact Research from Philosophia Mathematica

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Explore a collection of the most read and most cited articles making an impact in Philosophia Mathematica published within the past two years. This collection will be continuously updated with the journal's leading articles so be sure to revisit periodically to see what is being read and cited.

Also discover the articles being discussed the most on digital media by exploring this Altmetric report pulling the most discussed articles from the past year.

Most cited

On Algorithms, Effective Procedures, and Their Definitions
Philippos Papayannopoulos
Philosophia Mathematica, Volume 31, Issue 3, October 2023, Pages 291–329, https://doi.org/10.1093/philmat/nkad011
I examine the classical idea of ‘algorithm’ as a sequential, step-by-step, deterministic procedure ( i.e. , the idea of ‘algorithm’ that was already in use by the 1930s), with respect to three themes, its relation to the notion of an ‘effective procedure’, its different roles and uses in logic, computer science, and ...
Intuition, Iteration, Induction
Mark van Atten
Philosophia Mathematica, Volume 32, Issue 1, February 2024, Pages 34–81, https://doi.org/10.1093/philmat/nkad017
Brouwer’s view on induction has relatively recently been characterised as one on which it is not only intuitive (as expected) but functional, by van Dalen. He claims that Brouwer’s ‘Ur-intuition’ also yields the recursor. Appealing to Husserl’s phenomenology, I offer an analysis of Brouwer’s view that supports this ...
Mathematical Explanations: An Analysis Via Formal Proofs and Conceptual Complexity
Francesca Poggiolesi
Philosophia Mathematica, Volume 32, Issue 2, June 2024, Pages 145–176, https://doi.org/10.1093/philmat/nkad023
This paper studies internal (or intra-)mathematical explanations, namely those proofs of mathematical theorems that seem to explain the theorem they prove. The goal of the paper is a rigorous analysis of these explanations. This will be done in two steps. First, we will show how to move from informal proofs of mathematical ...
Identity and Extensionality in Boffa Set Theory
Nuno Maia and Matteo Nizzardo
Philosophia Mathematica, Volume 32, Issue 1, February 2024, Pages 115–123, https://doi.org/10.1093/philmat/nkad025
Boffa non-well-founded set theory allows for several distinct sets equal to their respective singletons, the so-called ‘Quine atoms’. Rieger contends that this theory cannot be a faithful description of set-theoretic reality. He argues that, even after granting that there are non-well-founded sets, ‘the extensional nature ...
The Logic for Mathematics without Ex Falso Quodlibet
Neil Tennant
Philosophia Mathematica, Volume 32, Issue 2, June 2024, Pages 177–215, https://doi.org/10.1093/philmat/nkae001
Informally rigorous mathematical reasoning is relevant. So too should be the premises to the conclusions of formal proofs that regiment it. The rule Ex Falso Quodlibet induces spectacular irrelevance. We therefore drop it. The resulting systems of Core Logic $ \mathbb{C}$ and Classical Core Logic $ \mathbb{C}^{+}$ can ...
No Easy Road to Impredicative Definabilism
Øystein Linnebo and Sam Roberts
Philosophia Mathematica, Volume 32, Issue 1, February 2024, Pages 21–33, https://doi.org/10.1093/philmat/nkad013
Bob Hale has defended a new conception of properties that is broadly Fregean in two key respects. First, like Frege, Hale insists that every property can be defined by an open formula. Second, like Frege, but unlike later definabilists, Hale seeks to justify full impredicative property comprehension. The most innovative ...

Most read

Research Article
How Should We Understand the Modal Potentialist’s Modality?
Boaz D Laan
Philosophia Mathematica, nkaf007, https://doi.org/10.1093/philmat/nkaf007
Modal potentialism argues that mathematics has a generative nature, and aims to formalise mathematics accordingly using quantified modal logic. This paper shows that Øystein Linnebo’s approach to modal potentialism in his book Thin Objects is incoherent. In particular, he is committed to the legitimacy of introducing a ...
Research Article
A Potentialist Perspective on Intuitionistic Analysis
Ethan Brauer
Philosophia Mathematica, nkae025, https://doi.org/10.1093/philmat/nkae025
Free choice sequences play a key role in the Brouwerian continuum. Using recent modal analysis of potential infinity, we can make sense of free choice sequences as potentially infinite sequences of natural numbers without adopting Brouwer’s distinctive idealistic metaphysics. This provides classicists with a means to make ...
Research Article
A Taxonomy for Set-Theoretic Potentialism
Davide Sutto
Philosophia Mathematica, nkae016, https://doi.org/10.1093/philmat/nkae016
Set-theoretic potentialism is one of the most lively trends in the philosophy of mathematics. Modal accounts of sets have been developed in two different ways. The first, initiated by Charles Parsons, focuses on sets as objects. The second, dating back to Hilary Putnam and Geoffrey Hellman, investigates set-theoretic ...
Research Article
Predicative Classes and Strict Potentialism
Øystein Linnebo and Stewart Shapiro
Philosophia Mathematica, nkae020, https://doi.org/10.1093/philmat/nkae020
While sets are combinatorial collections, defined by their elements, classes are logical collections, defined by their membership conditions. We develop, in a potentialist setting, a predicative approach to (logical) classes of (combinatorial) sets. Some reasons emerge to adopt a stricter form of potentialism, which ...
Research Article
Identity and Extensionality in Boffa Set Theory
Nuno Maia and Matteo Nizzardo
Philosophia Mathematica, Volume 32, Issue 1, February 2024, Pages 115–123, https://doi.org/10.1093/philmat/nkad025
Boffa non-well-founded set theory allows for several distinct sets equal to their respective singletons, the so-called ‘Quine atoms’. Rieger contends that this theory cannot be a faithful description of set-theoretic reality. He argues that, even after granting that there are non-well-founded sets, ‘the extensional nature ...
Research Article
Up with Categories, Down with Sets; Out with Categories, In with Sets!
Jonathan Kirby
Philosophia Mathematica, Volume 32, Issue 2, June 2024, Pages 216–227, https://doi.org/10.1093/philmat/nkae010
Practical approaches to the notions of subsets and extension sets are compared, coming from broadly set-theoretic and category-theoretic traditions of mathematics. I argue that the set-theoretic approach is the most practical for ‘looking down’ or ‘in’ at subsets and the category-theoretic approach is the most practical ...
Research Article
Inference to the Best Explanation as a Form of Non-Deductive Reasoning in Mathematics
Marc Lange
Philosophia Mathematica, nkae024, https://doi.org/10.1093/philmat/nkae024
This paper proposes that mathematicians routinely use inference to the best explanation (IBE) to confirm their conjectures. Mathematicians can justly reason that the ‘best explanation’ of some mathematical evidence they possess would be a proof of it that likewise proves a given conjecture. By IBE, the evidence thereby ...
Book Review
Critical Studies/Book Reviews
Eric Snyder
Philosophia Mathematica, nkae023, https://doi.org/10.1093/philmat/nkae023
DOI: https://doi.org/10.1017/9781009468862 . Despite its imperfections, Markus Pantsar’s Numerical Cognition and the Epistemology of Arithmetic is an important contribution to contemporary philosophy of mathematics. Building on recent empirical work on numerical cognition within developmental psychology and cognitive ...
Research Article
No Easy Road to Impredicative Definabilism
Øystein Linnebo and Sam Roberts
Philosophia Mathematica, Volume 32, Issue 1, February 2024, Pages 21–33, https://doi.org/10.1093/philmat/nkad013
Bob Hale has defended a new conception of properties that is broadly Fregean in two key respects. First, like Frege, Hale insists that every property can be defined by an open formula. Second, like Frege, but unlike later definabilists, Hale seeks to justify full impredicative property comprehension. The most innovative ...
Research Article
The Caesar-problem Problem
Francesca Boccuni and Luca Zanetti
Philosophia Mathematica, nkaf002, https://doi.org/10.1093/philmat/nkaf002
Hume’s Principle (HP) does not determine the truth values of ‘mixed’ identity statements like ‘ $ \#F $ = Caesar’. This is the Caesar Problem (CP). Still, neologicists such as Hale and Wright argue that (1) HP is a priori , and (2) HP introduces the pure sortal concept Number . We argue that Neologicism faces a ...
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