• Appendix A contains the mathematical questions mentioned in the Episodes. The coding of the questions is given in the Interlude.

• Appendix B contains the answers to the questions in Appendix A, relevant figures, theorems, proofs and in general it provides the mathematical background of the Episodes. The items of Appendix B are numbered according to the numbering of the Episodes. So, for instance, fig.5 in Appendix 6B is the figure mentioned in the Episode of Section (v) in Chapter 6.

• Appendix C contains the Extracts as referred to in the Sections of Chapters 6-9. The Extracts are pieces of data and are descriptions of the Episodes (either in dialogue form or summarised reconstructions of the dialogues). Their numbering follows the numbering of the Episodes in Chapters 6-9: so, for instance, Extract 7.3 is the Episode discussed in Section (iii) of Chapter 7. The Extracts are printed in italic format except where the participants' utterances are directly reproduced. I note that, in order to avoid identification, the names of the participants have been altered.