This is a very useful primitive that I just found now. http://tex.loria.fr/moteurs/etex_ref.html#predisplaydirection says:
"an internal read/write integer, initialised by e-TeX to indicate the direction of the last partial paragraph before a display; it is used to control the placement of elements such as equation numbers, and can be explictly set to affect this placement. " But whatever integer, I give to this primitive, I see no difference. Could please someone send a minimal document showing how this primitive actually works? Thanks -- Best wishes, Vafa Khalighi
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