I'm just going over (and over and over) the first FTC and i've come to the part where the Mean Value Thereom is used. In wikipedia's explanation of this thereom i don't quite understand a couple of things and hoped someone might be able to clarify them for me:
1) what is the symbol there that i've labled ? in and what does it mean?
2) What does that ?(t) part as a whole represent?