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**To**:*math-font-discuss@cogs.susx.ac.uk***Subject**:**Integral kerning****From**:*Matthias Clasen <mclasen@sun2.mathematik.uni-freiburg.de>***Date**: Mon, 29 Sep 1997 10:15:53 +0200 (MET DST)

One of the ideas in Justin Zieglers work was to kern the integrals with themselves to make it possible to write \int\int instead of \iint. Last weekend I have discovered that this is impossible (at least for the textstyle bigops), since Knuth says on p318 of the mfbook: Notice that a <label> can appear in a ligtable, charlist or extensible command. These appearances are mutually exclusive: No code may be used more than once as a label. Thus, for example, a characer with a ligature/kerning program cannot also be extensible, nor can it be in a charlist (except as the final item). After this discovery, I have removed the experimental kerning from the MX1-fonts (now even understanding the errors which vptovf gave me). Regards, Matthias -- Matthias Clasen Albert-Ludwigs-Universitaet Freiburg Institut für Mathematische Logik 79104 Freiburg, Germany. Tel.: +49 (0) 761-203-5606

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