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Genuinely ramified maps and monodromy
Published 16 Jan 2024 in math.AG | (2401.08526v1)
Abstract: For any genuinely ramified morphism $f\, :\, Y\, \longrightarrow\, X$ between irreducible smooth projective curves we prove that $\overline{(Y\times_X Y) \setminus \Delta}$ is connected, where $\Delta\, \subset\, Y\times_X Y$ is the diagonal. Using this result the following are proved: If $f$ is further Morse then the Galois closure is the symmetric group $S_d$, where $d\,=\, \text{degree}(f)$. The Galois group of the general projection, to a line, of any smooth curve $X\,\subset\, \PPn$ of degree $d$, which is not contained in a hyperplane and contains a non-flex point, is $S_d$.
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