New posts in algebraic-geometry

(geometric/intuitive) interpretation of ext

Isotrivial but non-trivial family of elliptic curves

Why tensor product of two sheaves of modules is a sheaf of modules?

Is the hyperbola isomorphic to the circle?

Characterizing all non-integrally closed subrings of $\mathbb{C}[t]$

Why did Hartshorne bother on schemes in his textbook when he worked only over an algebraically closed field?

Group of an Elliptic curve.

Let $X \subseteq \mathbb{P}_k^n$ be a smooth projective variety over $k$ algebraically closed. What is $\text{dim}_k(\mathcal{O}_{X, x}/m_x^2)$?

The double cone is not a surface.

Definition of "point at infinity"

Finite implies Quasi-finite

Questions in algebraic geometry related to finding $V_A(X)$

Theorem 3.2, Chapter 1, of Hartshorne's Algebraic Geometry

Why is the affine line with a doubled point not a separated scheme?

Number of points on a line in a finite projective plane

What is a left-invariant Vector field? [closed]

Do the pictures in Hartshorne Ex. 1.5.1 make sense?

Do these definitions of irreducibility of algebraic sets coincide?

Extension of regular function

How to calculate the Euler class, Euler characteristic and top Chern class of $End(E)$?