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math.AG2021
Étale Covers and Fundamental Groups of Schematic Finite Spaces
J. Sánchez González, C. Tejero Prieto
We introduce the category of finite étale covers of an arbitrary schematic finite space and show that, equipped with an appropriate natural fiber functor, it is a Galois Catego…
math.AG2021★ 1 cited
Universal ringed spaces
J. Sánchez González, F. Sancho de Salas
We construct affine spaces, projective spaces and grassmannians in the ca\-te\-gory of ringed spaces. We show how finite posets and sheaves of rings on them appear in a natural way…