Hello !

Your maths "Tools : Catalog... : Special" is too short a list.
Unicode 21A6 arrow is very used in French mathematics, from High school on. As a
consequence, it's also used in many French speaking countries, as well as
probably in some other European countries.

I suggest most Unicode mathematical operators (2200 to 22F1) be included in the
catalog if their equivalents are not accessible otherwise. More Unicode arrows
(2190 to 21EA) could be added too.

This feature should be added at least when the user has chosen a Unicode font in
Format : Fonts.

Another way to get the same result would be to provide the Writer "Insert :
Special Character" feature in the formula editor.

In fact, I can add any Unicode character in a formula, but I have to close the
formula, insert the caracter in the Writer text (Insert : Special character),
copy the character, re-open the formula, paste the character.
   Then it appears correctly in the formula itself (if I have chosen a Unicode
font in the formula format), but is replaced by a small rectangle in the formula
editor window.