The problem is that the plus sign is interpreted as an operator. To avoid this, you must add the plus symbol to the catalog and then reference it as a symbol. It took me a while to figure out how to do this...

I started entering the formula

H^{}

I placed the cursor in the curly brackets

H^{|cursor_is_here|}

Use Tools | Catalog to open the catalog with symbols. I added the symbol to the Special symbol set, so select the special symbol set rather than the Greek symbol set.

Click Edit

Near the bottom, there are fields for

Symbol
Symbol set
Font
subset
Typeface

Under Symbol, enter the text plus. This says that you want to create a new symbol named plus. It probably says "and", which means that you could change how the and symbol appears.

Leave the Symbol set as Special.

Choose a plus sign from the characters.

The Add button in the lower right corner should now be active. click Add.

Now, select the "+" and click insert.

Your formula is now:

H^{%plus}

The symbol name is %plus. We associated this symbol with "+".
If we simply enter a +, it is treated as an operator. This way, we get the + and it is not treated as an operator.


Gustavo O. Bonilla Rodriguez wrote:
Hello, I tried to insert the symbol for protons that would be H^{+} in 
equations, but the result is a mess. Who knows how to do it?

Gustavo O. Bonilla Rodríguez (Prof. Dr.)
Depto. de Quimica e Ciências
Ambientais IBILCE-UNESP
São José do Rio Preto SP Brasil
Tel (5517) 3221-2361/ Cel 9111-6372
http://www.ibilce.unesp.br/departamentos/qca/docentes/gustavo.php


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