Introduction to the special issue

摘要

There is no doubt that Frege's and Husserl's famous attack on Psycho-logism in logic had a significant influence on the emergence of logic as aseparate discipline. Now that this battle can be safely regarded won, it istime to reconsider psychologism from a modern point of view. Logic hastaken a cognitive turn in the meantime: formal representations of agentsare used as parts of logical models, cognitive concepts are treated as logicalconstants in much the same way as the negation sign or the quantifiers, thelogic of commonsense reasoning has become the joint interest of theoreticalcomputer scientists and psychologists, and naturalistic accounts of logic andmathematics aim to reduce the gap between the apriori and the empirical.Does this necessitate a reassessment of psychologism in logic? That is thequestion to be addressed by this special issue.