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**To**:*ziegler@goofy.zdv.uni-mainz.de***Subject**:**extensible delimiters****From**:*Jim.Davies@prg.oxford.ac.uk***Date**: Fri, 20 Aug 93 13:35:10 BST**Cc**:*math-font-discuss@cogs.susx.ac.uk*

Could I have some references for the extensible versions of the following: [| |] -- semantic brackets (almost universal) (| |) -- relational image (in Z) {| |} -- bag symbol (some dialects of CSP) <| |> -- bindings (in Z) If those are only used in Z and CSP, maybe i got forget about them ? I agree with Jorg's comments on this. People *want* new forms of brackets, and will use them eagerly if provided... it would be nice to have some provision for the future... [ I'm not sure about extensible versions, but I would regard these as *much* more useful than horizontally extensible accents etc., which tend to look ugly---in my sort of maths, anyway. ] And I would suggest that users of Z-like notations will form a sizeable proportion of TeX users in the future. Say what you like about specific notations, but the symbol requirements are more general than that. Jim

**References**:**extensible delimiters***From:*Justin Ziegler <ziegler@goofy.zdv.uni-mainz.de>

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