Dear All, Roger Jones and I are doing some more work on Unicode and UTF-8 support in ProofPower. We are currently considering two changes to the Unicode mapping as currently defined at:

http://www.lemma-one.com/ProofPower/unicode/pp-unicode.html <http://www.lemma-one.com/ProofPower/unicode/pp-unicode.html> 1) Supporting Unicode/UTF-8 in xpp and the various document-processing scripts would be much simpler, if each character in the ProofPower extended character set mapped to a single Unicode code point. Currently the only exception is the symbol for distributed concatenation which has to be translated into two code points (a frown followed by a slash). Since frown-slash is already accepted as a synonym for the single character for distributed concatenation we would like to withdraw the single character mark-up from the ProofPower Z library. 2) We would like to use the MathML XML entity set as a standard set of human-readable names for Unicode code points. However, there a few slight discrepancies that need to be resolved: At Phil Clayton’s (nice) suggestion, the ProofPower mapping currently maps the greek letters to the corresponding code points for Mathematical Alphanumeric Symbols in the range 1D400–1D7FF. The MathML entities use the code points for Greek in the range 0370–03FF. The Mathematical Greek Symbols do look nice, but to gain compatibility with MathML, we would like to revert to using the code points for Greek in the range 0370-03FF. This will also allow you to enter Greek by switching to a standard Greek keyboard mapping. In passing we will also use the right symbol for φ (the current mapping uses what LaTeX calls \varphi rather than \phi). Any comments on this would be appreciated. Regards, Rob.

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