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De Franchis theorem : ウィキペディア英語版
De Franchis theorem
In mathematics, the de Franchis theorem is one of a number of closely related statements applying to compact Riemann surfaces, or, more generally, algebraic curves, ''X'' and ''Y'', in the case of genus ''g'' > 1. The simplest is that the automorphism group of ''X'' is finite (see though Hurwitz's automorphisms theorem). More generally,
*the set of non-constant morphisms from ''X'' to ''Y'' is finite;
*fixing ''X'', for all but a finite number of such ''Y'', there is no non-constant morphism from ''X'' to ''Y''.
These results are named for Michele De Franchis (1875–1946). It is sometimes referenced as the De Franchis-Severi theorem. It was used in an important way by Gerd Faltings to prove the Mordell conjecture.
==See also==

*Castelnuovo–de Franchis theorem

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