Actually I don't know much about font formats such as TTF, OpenType, and Type1.
- What are the differences between TTF, OpenType, and Type1?
- Which one should I use in PDF produced by LaTeX?
- How to explicitly specify in LaTeX input file if I want to use one of them? For example: I want to use Helvetica in TTF or OpenType rather than Type1.
- Is it possible to use the same font but with 3 different types. For example: in my PDF document, paragraph A uses Arial fonts in TTF, paragraph B uses Arial fonts in OpenType and paragraph C uses Arial fonts in Type1.