1. See I. Lakatos, Proofs and Refutations: The Logic of Mathematical Discovery (Ed. by J. Worral and E. Zahar). Cambridge University Press, Cambridge, U.K., 1976, p. 5.
2. Ibid., Editors’ Preface, p.ix.
3. Concerning Cauchy’s proof of the theorem that the limit of any convergent sequence of continuous functions is itself continuous
4. Op cit., Editors’ Preface, p. ix.
5. See Kurt Von Fritz, ‘The Discovery of Incommensurability by Hippasus of Metapontum’, in D. J. Furley and R. E. Allen (Eds.), Studies in Presocratic Philosophy Routledge and Kegan Paul, London, 1970, pp. 401–404.