[luatex] \predisplaydirection from etex in luatex has no effect

Diederick C. Niehorster dcnieho at gmail.com
Thu Apr 8 11:35:30 CEST 2010

On Thu, Apr 8, 2010 at 5:23 PM, Vafa Khalighi <vafakh84 at gmail.com> wrote:
> I am just saying this as my own perspective and it does not need to be
> correct. Firsty several diferent scripts use RTL writing and the convention
> for writing maths is different from one RTL script to the other. As an
> example Persian maths is exactly like LTR maths, we do not do RTL maths
> \eqno should appear on RHS and \leqno should appear on LHS. but I think in
> Arabic, they have RTL maths as well, and so the place of \eqno and \leqno is
> interchanged. In other RTL scripts, they do maths LTR, but the place of
> \eqno and \leqno is interchanged.

Hi Vafa,

>From your description, wouldn't it make more sense if there is a
separate switch setting whether placing of \eqno and \leqno is
interchanged? That is, one that does not follow \mathdir but is
independent of it? A polyglossia- or babel-like package could then set
this correctly for the language in question.


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