Thanks for answering me. I just want to make sure that I understand this correctly.
If I'm reading your answer right, in the first example on the top of the fraction, I would need a [bold indicator], then the [letter indicator], then d sub f - [bold indicator], [letter indicator] d sub o. Is that right?
And for the second fraction, I would need a [bold indicator] delta [letter indicator] d. I don't think I would need a letter indicator before the delta because that would already have a Greek letter indicator. Is that right? Or do I need another bold indicator after the delta?
I've added the brackets just for clarification - they wouldn't actually be keyed.