I wonder what to do about parentheses that follow each other, as in this phrase: "(I have taken out my comments in the GoogleDoc (and corrected a couple of spelling errors thanks to Grammarly) )." I put a space between the last two parentheses, but don't know if that's proper or not.
Actually, you should not put parenthesis within parenthesis. It makes a mess of where the parenthetical statements begin and end. If you need to make a parenthetical statement within parenthesis, and commas do not suffice, you should use square brackets instead.
For reference, provision 162 of the Chicago Manual of Style (1st edition), which is found on page 58 of the book, states the folllowing:
- Brackets are used to inclose an explanation or note, to indicate an interpolation in a quotation, to rectify a mistake, to supply an omission, and for a parenthesis within a parenthesis.
The last example the Chicago Manual of Style under this provision illustrates that there is no space between the closing bracket and the final parenthetical mark.
Grote, the great historian of Greece (see his History, I, 204 [second edition]),
It is more compact than including a space, while being less awkward and cumbersome than putting two closing parenthesis right next to each other.