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**To**:*math-font-discuss@cogs.susx.ac.uk***Subject**:**Unicode mathematical control characters****From**:*Hans Aberg <haberg@matematik.su.se>***Date**: Mon, 16 Nov 1998 23:10:21 +0100**Cc**:*Taco Hoekwater <taco.hoekwater@wkap.nl>*- Content-Length: 2070

Is it allowable to submit math control characters to Unicode? After all, Unicode has added new control characters such as line and paragraph separators. If one has a few math control characters, then a wide variety of math symbols could be assembled by intelligent renderers; simpler programs could display a default symbol instead for each control character it does not know how to handle. Suppose one has the following control characters above presup ______ sup | | before | over | after |______| presub below sub for the positioning of a new symbol relative an old symbol, plus "logical left parenthesis", "logical right parenthesis", "mathematical horizontal tab", and "mathematical vertical tab". Then these many common math symbols can be constructed, plus such things as chemical symbols and such. I can give some examples how this might work: Name the symbols 00 presup 01 above 02 sup 10 before 11 over 12 after 20 presub 21 below 22 sub 30 logical left parenthesis 31 logical right parenthesis 32 mathematical horizontal tab 33 mathematical vertical tab Then for example, a matrix ( x y u v ) could be described as ( x #32 y #33 u #32 v ) A summation sign "Sum" with the expression "n = 1" below could be described as Sum #21 #30 n = 1 #31 The isotope 14 of carbon could be written 14 C could described as C #00 14 and so on. This the does not preempt developments such as MathML and OpenMath, as one still is only on the level of describing the logical relation between mathematical characters, and not full-fledged symbols. This is basically what is needed if one should be able to express simple mathematical expressions in a letter of type Unicode text. Hans Aberg * Email: Hans Aberg <mailto:haberg@member.ams.org> * Home Page: <http://www.matematik.su.se/~haberg/> * AMS member listing: <http://www.ams.org/cml/>

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