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6 votes
1 answer
1k views

Smoothness of the branch divisor and ramification on surfaces

Let $f \colon X \longrightarrow Y$ be a finite morphism of degree $n \geq 2$ between smooth compact, complex surfaces. Let $B \subset Y$ be the branch divisor of $f$ and assume that the ...
Francesco Polizzi's user avatar
2 votes
1 answer
501 views

Kummer Coverings

Let $L_1$, $\cdots$, $L_k$ be homogenous linear forms in three variables $z_0$, $z_1$, $z_2$ defining $k$ lines in $\mathbb{P}_{2}$. Consider the abelian extension $K ((L_2/L_1)^{1/n}, \cdots, (L_k/...
jung y's user avatar
  • 21
9 votes
1 answer
1k views

Finite morphisms to projective space

Let $X$ be a projective variety of dimension n. Then there exists a finite surjective morphism $X \to \mathbf P^n$. Let $d$ be the minimal degree of such a finite surjective morphism. Let $d^\prime ...
Edgar JH's user avatar