Psychologism

From Freepedia

Psychologism in the philosophy of mathematics is the explanation or derivation of mathematical or logical laws in terms of psychological facts. Psychologism in general extends the explanations to all of philosophy, although the term is rarely used that way today and the more restricted application to philosophy of mathematics is the primary usage.

The position (especially with regards to the mathematical or logical interpretation) was primarily established by John Stuart Mill and then later famously critiqued by Frege in his review of Husserl's Philosophy of Arithmetic. In the Prolegomenon to his "Logical Investigations" Husserl himself criticized psychologism and sought to distance himself from it.