George Boolos and Richard G. HeckJnr. Die Grundlagen der Arithmetik, §§82–3. The philosophy of mathematics today, edited by Matthias Schirn, Clarendon Press, Oxford University, Oxford and New York 1998, pp. 407–428. - Richard G. HeckJnr. The finite and the infinite in Frege's Grundgesetze der Arithmetik. The philosophy of mathematics today, edited by Matthias Schirn, Clarendon Press, Oxford University, Oxford and New York 1998 pp. 429–466. - Crispin Wright. On the harmless impredicativity of N= (‘Hume's principle’). The philosophy of mathematics today, edited by Matthias Schirn, Clarendon Press, Oxford University, Oxford and New York 1998 pp. 339–368. - Michael Dummett. Neo-Fregeans: in bad company? The philosophy of mathematics today, edited by Matthias Schirn, Clarendon Press, Oxford University, Oxford and New York 1998 pp. 369–387. - Crispin Wright. Response to Dummett. The philosophy of mathematics today, edited by Matthias Schirn, Clarendon Press, Oxford University, Oxford and New York 1998 pp. 389–405.