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16
Is a cover Galois if and only if it is geometrically Galois
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13
Does every Noetherian domain have finitely many height 1 prime ideals?
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11
Why are locally closed subschemes not open subschemes of closed subschemes?
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11
Is every algebraic curve birational to a planar curve
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10
Connectedness of the spectrum of a tensor product.
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9
isolated non-normal surface singularity
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8
Is local isomorphism totally determined by local rings?
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8
constructing a projection onto a variety
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7
Localization at a prime ideal is a reduced ring
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7
Exercise on separable polynomials over fields of prime characteristic
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7
Spectrum of $\mathbb{Z}[x]$
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7
Curves not embeddable in the projective plane - examples?
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7
Open affine neighborhood of points
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7
The resemblance between Mordell's theorem and Dirichlet's unit theorem
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6
Does there any non discrete metric space in which closure of an open ball is not closed ball?
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6
Hom and tensor with a flat module
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6
For a topological group $G$ and a subgroup $H$, is it true that $[\overline{H}, \overline{H}] = \overline{[H,H]}$? What about algebraic groups?
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6
Principal ideals in completions of Zariski rings
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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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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?
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6
Lying-over theorem without Axiom of Choice
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6
Trivial Restriction of Line Bundles
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6
Which elements of a ring have zero differential?
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6
Conditions for a curve to be defined over a subfield
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6
Can you have a ring homomorphism from a ring to itself which isn't the identity?
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6
Locus of points in which two morphisms of schemes coincide
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6
Eisenstein polynomial in Dedekind domain is irreducible in field of fractions
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6
Why is the rank of $f_\ast L$ the degree of $f$
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6
Is noetherianity a local property?
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6
Is Klein bottle an algebraic variety?
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