Check if variables are used in math mode

[hofbi]

Another useful check for the TeX checker would be to identify variables which are used in the text but not in math mode ($variable$). This mainly happens if variables don't have a subscript or superscript and are just a single character.

[emareg]

Can you give an example that could be detected? I think simple one letter variables would produce more false positives than correct hits.

[hofbi]

Not entirely sure what was the example that led to this issue. But now rethinking this I could imagine the following initial solution:

• We parse all equations/math mode parts and identify the variables and add them to a set
• Then we check if those variables occur as regular words