Schottky problem
In mathematics, the Schottky problem, named after Friedrich Schottky, is a classical question of algebraic geometry, asking for a characterisation of Jacobian varieties amongst abelian varieties. == Geometric formulation == More precisely, one should consider algebraic curves C {\displaystyle C} of a given genus g {\displaystyle g} , and their Jacobians Jac ( C ) {\displaystyle \operatorname {Jac} (C)} .