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**To**:*math-font-discuss@cogs.susx.ac.uk***Subject**:**nabla, laplace, d'alembert****From**:*Justin Ziegler <ziegler@goofy.zdv.uni-mainz.de>***Date**: Thu, 19 Aug 1993 10:22:49 +0000

<<<< we seemingly both agree that \nabla and the Laplace operator should be visually compatible. >>>> I think we all agree ! <<<<While there is a perfectly suitable \nabla symbol in the present cmsy, there is *no* specific symbol for the Laplace operator. It is usually refered to as \Delta (upright), but that's unfortunate if uppercase greek letters (when used as identifiers) are set in math italics instead of math roman.>>>> The situation is the following: the MC encoding ( the one going to replace cmmi) contains uppercase and lowercase greek in upright and in italic. So far I had included the upsidedow delta (nabla) next to the Greek material. thus these would have been compatible. And we would always in a standard setup have an upright Greek alphabet. Are things OK so far ? We have got to the stage where every glyph slot is presious. About quabla: if i remember rightly, it is just a rectangle. cspex has an oblong, and that could maybe be used, stmary has it also. On the tother hand, I could include a quabla next to the Greek, and it would therefore be with nabla and delta. if nobody complains, i'll consider that oblong can be used. JZ

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