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**To**:*Thierry.Bouche@ujf-grenoble.fr***Subject**:**Re: Binary Relations, draft 1****From**:*Joerg Knappen <KNAPPEN@alpha.ntp.springer.de>***Date**: Wed, 18 Nov 1998 11:10:24 +0000 (CE)**Cc**:*math-font-discuss@cogs.susx.ac.uk*- Content-Length: 1153

IMHO the rule for upright setting is, that (beside some other entities) _numbers_ are typeset upright. Note that it is not _constants_, since any ad hoc constants (typically denoted by $c$ or $k$) are typeset in math italics. e, i, j, k, pi (my preferred macros: \ee, \ie, \je, \ka, \pie) are numbers, not just constants. Unfortunately, as noted before, there is no standard markup for the upright math constants. Each publisher uses a different one. Here is my short list: Springer-Verlag Vieweg Spektrum akad. Verlag d \D \de \de D e \E \ee \ee i \I \ie \ie j k delta Delta micro pi Ohm partial Gaps mean: not implemented. --J"org Knappen P.S. The reason behind my preffered macros (by adding an e to the letter name): a) No overloading of established TeX macros (like \d and \e) b) Case sensitive, i. e. \de and \De are available for different things c) Short (even compared to \diff and \eul, or compared to a typical LaTeX2e internal command like *\mathdifferntialsign or *\matheulerconstant [note: the asterix denotes that the names aren't really existing])

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