Adding Symbols In OpenOffice.org Math

I needed to insert symbols for therefore and logical equivalence in my OpenOffice.org Writer documents These are not present in the symbol sets available in OpenOffice.org Math. However, I was able to figure out how to add these and other symbols in an existing symbol set (Special):

1. In OpenOffice.org Math, choose Tools > Catalog > Edit.
2. In the Font list box, select a font containing the desired symbol. All the available symbols for that font will appear in the symbols pane. (In my case, I found the symbols for therefore and logical equivalence in the Mathematica1 font stored in my computer.)
3. Click the target symbol in the symbols pane.
4. Type a name for the symbol, for example, therefore.
5. In the Symbol set list box, select the Special symbol set (or type a new name to create a new symbol set). The new symbol is displayed in the right preview pane.
6. Click Add and then OK.
   

The new symbol can now be inserted in the formula by

1. Choosing Tools > Catalog,
2. Choosing Special in the Symbol set list box,
3. Clicking on the symbol and
4. Clicking Insert.
   

A faster way is by typing the name of the symbol preceded by a percent sign. For example, typing everything on the first line of the image below, highlighting the same and invoking the Formula command will give you the symbols you see in the second line.