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**To**:*math-font-discuss%cogs.susx.ac.uk@rz.uni-duesseldorf.de***Subject**:**Re: on upright lowercase greek****From**:*Ulrik Vieth <vieth@thphy.uni-duesseldorf.de>***Date**: Tue, 7 Oct 1997 14:22:37 +0200

Thierry Bouche: >> (similar to upright d for differentials), upright pi >> for the mathematical constant (similar to upright e and upright i). > we discussed these issues somewhere else, it appeared that -- at least > in France -- there is an official norm precising that e, i & d should > be set in italic! > What is the consensus on `national traditions': to have a generic > encoding, and have different fonts according to different usages? or > do you think they simply should vanish in favor of a unique > debabelized maths convention? Well, there are ISO standards for the fields of engineering (see for example Claudio Beccari's detailed article in one of the recent TUGboat issues) and there are the IUPAP ``recommendations'' for the field of physics. I suppose a physics or engineering journal intended for an international audience should better follow these, regardless of national traditions. If no such an international standards apply for a specific field (is there anything for math?), then an author or publisher might well choose to follow the traditional style. In the end, it all boils down to the following requirements: * the font encoding must include a sufficiently rich symbol complement to be able to support various styles. * the mark-up of a document should be generic enough to be able to switch between different conventions behind the scenes. Thus, for example, if an author writes $\vec{v}$ or $\tens{T}$, one might easily switch the representation of these tags between arrow accents of bold math italics or bold sans serif italic. If an author just writes $\boldsymbol{v}$ or $\mathsfb{T}$, things are getting difficult. The same, of course, applies for the upright d, e, i, etc. If there are markup tags like \d, \e, \i in math mode, which would allow to encode the special meaning without losing much of the readability, one could easily leave it to the publishers style, whether or not to make them upright or italics. Cheers, Ulrik.

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