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… Milton Keynes England: The Open University Press. Wolf, R. P. (1973). Kant’s theory of mental activity. Gloucester, … in learning and teaching mathematics. In A. Gutierrez and P. Boero (Eds.), Handbook of research on the psychology of … Milton Keynes England: The Open University Press. Wolf, R. P. (1973). Kant’s theory of mental activity. Gloucester, …