New posts in algebraic-geometry

locally free resolution for computation of Ext sheaves in Hartshorne Proposition 6.5 [duplicate]

Recognizing a fiber product of schemes

Map between formal neighbourhoods

Demystifying the Magic Diagram

Quasiseparated if finitely covered by affines in appropriate way

How can we prove that $D(f)\backsimeq\operatorname{Spec} A_f$?

Prove that the upper half plane of Cartesian plane is not an affine variety

Rational map of curves extends to a morphism if $C$ regular

Algebraic geometry project ideas for high school students

Importance of Noether normalisation lemma

Is the graph of morphism of projective varieties $X \rightarrow Y$ closed in $X \times Y$?

Spectrum of $R[x]$

Genus 2 - Points at Infinity

Can the completion of a domain be a non-domain?

how to show that $V( Y-X^2 )$ is irreducible?

Generic flatness on modules

Why do we retain exactness when tensoring by $\mathcal{O}_C$ in Hartshorne, Lemma V.1.3?

A plane algebraic curve with all four kinds of double points

quasi-compact and compact in algebraic geometry

Parametrization of a conic and rational solutions