1. ‘CP’ refers to Gottlob Frege, Collected Papers on Mathematics, Logic, and Philosophy, ed. by Brian McGuinness, Basil Blackwell, Oxford and New York, 1984.
2. Joan Weiner, Frege in Perspective, Cornell University Press, Ithaca and London, 1990, p. 11.
3. It is important in understanding this terminology to keep in mind Frege’s earlier use of ‘Inhalte as described by Leila Haaparanta, p. 59 of her Frege’s Doctrine of Being, Acta Philosophica Fennica 39, 1985. See also Weiner, pp. 113–114.
4. Cf. Weiner, pp. 99–101, with reference to the epistemology of arithmetic and the point of Frege’s enterprise.
5. ‘PW’ refers to Gottlob Frege, Posthumous Writings, University of Chicago Press, Chicago, 1979.