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**To**:*math-font-discuss@cogs.susx.ac.uk***Subject**:**Re: Another technical question about arrow-building****From**:*alanje@cogs.susx.ac.uk (Alan Jeffrey)***Date**: Wed, 11 Aug 93 21:00 BST

>Justin asked about the \flat and \sharp. I replied that I have used both >of them in my thesis (Algebraic Topology) to denote duality between algebraic >structures. Yes, the `abstract nonsense' crowd are very into \flat, \sharp and \natural. They're common enough in that field to be strong contenders for inclusion in an MSi encoding. I don't think they're dependent enough on the MC font shape to deserve going into MC (fortunately, since space in MC is going to be precious!) >It woul be nice to investigate the influence of \TeX\ on typesetting and >doing mathematics. I think that would be a very nice and very useful paper. I'm sure that TeX has has quite an influence on the choice of mathematical notation of the last 10+ years. Any volunteers? One example of TeX's influence (IMHO) is the choice of different mathematicians to use $\bigsqcup$ or $\bigvee$ to mean `lattice join'. Partly this is tradition, but partly I expect that the lack of a $\bigsqcap$ in cmex meant that anyone who stepped from the theory of complete semi-lattices to the theory of lattices would suddenly need to use $\bigvee$ and $\bigwedge$! So CS and domain theory types (who don't use meet very much) stick with $\bigsqcup$ whilst the lattice theorists use $\bigvee$... >In another message I was asking about oblique arrows (in category theory and >algebraic topology they [oops, I almost said ``we''...] need them a lot for >diagrams). Yes, there is a need for diagonal arrows, the question is how much should be covered by the vanilla math fonts, and how much should be left to the commuting diagrams package. I expect the final answer will depend on how many free slots there are in MX! >Any plans of incorporating Michael Spivak's LAMS fonts, Are these up for anonymous ftp from somewhere? >or perhaps the work on arrows presented in Prague? Ditto? Alan.

**References**:**Re: Another technical question about arrow-building***From:*yannis@gat.citilille.fr (Yannis Haralambous)

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