Installation....

What is it?

A software.....(something like a Equation-editor) for typing math-symbols.....

I don't think it's possible.

Why not just have a 'library' of math characters on the sidebar, for quick copy/paste?

You can only install flash-based widgets in the sidebar.

zakclo, how to install that library?

What I mean by 'library' is really just simple text place on the sidebar with whatever math symbols you wanted members to be able to use.

To do that:

1. Forum Admin> Appearance> Sidebar>

2. In the dropdown menu 'select a widget to add' select 'custom html' and type the characters you want available for use.

3. Save the widget and the layout and it will appear on your sidebar (like over there >>)

p.s. Many math symbols can be typed on a PC by holding down the ALT key and typing a numerical code as shown on this website

Hope this helps...