Well, the title is quite self-explaining. I haven't read anything so far in Hartshorne's Algebraic Geometry, but looking at ME (and listening to what a close friend of mine told me about it) it really seems that one has to prepare to hard and painful days if interested in reading/studying it. Act...
I feel completely in the dark, like I am totally missing what is going on behind the scenes in this section. I apologize in advance.
Prop. 6.9: Let $X \to Y$ be a finite morphism of non-singular curves, then for any divisor $D$ on $Y$ we have $\deg f^*D=\deg f\deg D$.
I don't understand ...
I feel completely in the dark, like I am totally missing what is going on behind the scenes in this section. I apologize in advance.
Prop. 6.9: Let $X \to Y$ be a finite morphism of non-singular curves, then for any divisor $D$ on $Y$ we have $\deg f^*D=\deg f\deg D$.
I don't understand ...
