Humbert surface explained

In algebraic geometry, a Humbert surface, studied by, is a surface in the moduli space of principally polarized abelian surfaces consisting of the surfaces with a symmetric endomorphism of some fixed discriminant.

References

• • Humbert, G., Sur les fonctionnes abéliennes singulières. I, II, III. J. Math. Pures Appl. serie 5, t. V, 233 - 350 (1899); t. VI, 279 - 386 (1900); t. VII, 97 - 123 (1901)