Talk:Godunov's scheme

Time Derivative Notation
I don't really get, why in the time derivatives small q is replaced by big Q. I think it should be small q there, as well. In the later lines it's small q again, but the notation changes from $$x_i$$ to $$x_{l,r}$$?

Can anyone shed some light on this?

UtzT (talk) 09:16, 19 March 2015 (UTC)