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Dear Ken, Relax. The role of the list seems to be batting ideas backwards and forwards trying to improve reasoning? I'm thankful to you for of your precision with definitions. Many of us feel very short of knowledge (ignorant even) compared to Honoris Causa Profs like yourself. Man embarrassing. I've just realised I've been misremembering and making that deontic/deictic error for several years. Ah well. Anyways... I'm interested in how you see the difference between 'deictic proof' and 'self-evident proof'? The words and origins seem very similar: 'Deictic' - showing or pointing out from deikitos meaning 'able to show' 'Demonstrative' (as in demonstrative logic) and 'demonstration' from de and monstrare ' able to show' Self-evident - from 'able to show'. I welcome your thoughts. All the best, Terry ----------------------------------------------------------------- PhD-Design mailing list <[log in to unmask]> Discussion of PhD studies and related research in Design Subscribe or Unsubscribe at https://www.jiscmail.ac.uk/phd-design -----------------------------------------------------------------