QiL'8

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425 Answers

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16
Is a cover Galois if and only if it is geometrically Galois
13
Does every Noetherian domain have finitely many height 1 prime ideals?
11
Is every algebraic curve birational to a planar curve
11
Why are locally closed subschemes not open subschemes of closed subschemes?
10
Connectedness of the spectrum of a tensor product.
9
isolated non-normal surface singularity
8
constructing a projection onto a variety
8
Is local isomorphism totally determined by local rings?
7
The resemblance between Mordell's theorem and Dirichlet's unit theorem
7
Open affine neighborhood of points
7
Curves not embeddable in the projective plane - examples?
7
Spectrum of $\mathbb{Z}[x]$
7
Exercise on separable polynomials over fields of prime characteristic
7
Localization at a prime ideal is a reduced ring
6
n-canonical embedding
6
On an exercise from Hartshorne's Algebraic Geometry
6
Serre's Theorem for $\operatorname{Proj}$
6
Sheaves on $\mathbb{P}^n \times \mathbb{P}^m$, and a commutation relation for derived functors of global sections and tensor products on it.
6
Is Klein bottle an algebraic variety?
6
Why is the rank of $f_\ast L$ the degree of $f$
6
Is noetherianity a local property?
6
Eisenstein polynomial in Dedekind domain is irreducible in field of fractions
6
Locus of points in which two morphisms of schemes coincide
6
Can you have a ring homomorphism from a ring to itself which isn't the identity?
6
Conditions for a curve to be defined over a subfield
6
Which elements of a ring have zero differential?
6
Trivial Restriction of Line Bundles
6
Lying-over theorem without Axiom of Choice
6
Is $f$ reduced if and only if the derivations $\gcd(\frac{\partial f}{\partial x},\frac{\partial f}{\partial y})=1$ under some conditions?
6
Why is $F^*(\mathcal L) = \mathcal L^{\otimes p}$ where $F$ is the absolute Frobenius and $\mathcal L$ is an invertible sheaf?
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