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Frege versus Cantor and Dedekind: On the Concept of NumberIn Matthias Schirn (ed.), Frege: importance and legacy, Walter De Gruyter. pp. 70-113. 1996.
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To appear in the Proceedings of Logic Colloquium 2006. (28 pages).
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To appear in the Proceedings of Logic Colloquium 2006. (32 pages).
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Constructive ReasoningIn B. Van Rootselaar & J. F. Staal (eds.), Logic, Methodology and Philosophy of Science III, North-holland. pp. 185-99. 1968.
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