Is Logic all in our Heads? From Naturalism to Psychologism

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l. Overview 2. The Language of Logic and Mathematics 3. Sense, Reference, Compositionality, and hierarchy 4. Frege’s Logic 5. Frege’s Philosophy of Mathematics 5.1. Critique of Naturalism, Formalism, and Psychologism 5.2. Critique of Kant 5.3. Frege’s Definition of Number 5.3.1. Numerical Statements Are about Concepts 5.3.2. But Numbers Are Objects 5.3.3. Objects and Identity 5.3.4. The Number ...

Husserl’s Arguments against Logical Psychologism and his Conception of Ideal Objects

Husserl’s main arguments against Logical Psychologism (LP) are found in the Prolegomena to the Logical Investigations. The core commitment of LP is the thesis that logic is explanatorily reducible to psychology. This was the dominant view of the foundations of logic at the time Husserl wrote the Logical Investigations. The relevance of Husserl’s arguments in the Prolegomena is not, however, res...

Mariusz Urbański LOGIC AND COGNITION : Two Faces of Psychologism

In this paper two concepts of psychologism in logic are outlined: the one which Frege and Husserl fought against and the new psychologism, or cognitivism, which underlies a cognitive turn in contemporary logic. Four issues such cognitively oriented logic should be interested in are indicated. They concern: new fields opened for logical analysis, new methods and tools needed to address these fie...

All Heads Gently Nodding How Naturalism Dissolves the Problem of Other Minds

Logic and Cognition: Two Faces of Psychologism

In this paper two concepts of psychologism in logic are outlined: the one which Frege and Husserl fought against and the new psychologism, or cognitivism, which underlies a cognitive turn in contemporary logic. Four issues such cognitively oriented logic should be interested in are indicated. They concern: new fields opened for logical analysis, new methods and tools needed to address these fie...