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15
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Examples of Stacks

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#algebraic-geometry #algebraic-stacks
631
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Is $(x^2+y^2-1, z^2+w^2-1)$ a prime ideal in $\mathbb Q[x,y,z,w]$?

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#algebraic-geometry #polynomial-rings
1k
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The symmetry group / isometry group of the complex projective space

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#algebraic-geometry #manifolds #complex-geometry #projective-space #quotient-spaces
614
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Is the étale site a small category?

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#algebraic-geometry #category-theory #set-theory #schemes
81
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Regular functions on standard open sets

Published on
#algebraic-geometry
244
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blowing-up preserves the first Betti number?

Published on
#algebraic-geometry #complex-geometry #blowup #k3-surfaces
80
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Definition of "objet en catégories".

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#algebraic-geometry #category-theory #homological-algebra
571
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Sheaf on basic open sets.

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#algebraic-geometry #sheaf-theory #limits-colimits
219
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Does a sheaf of abelian groups on a scheme $X$ induce a sheaf of abelian groups on the étale site $X_{ét}$?

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#algebraic-geometry #schemes #topos-theory #etale-cohomology
582
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Equations in trilinear coordinates for the line through two points, and the circle through three

Published on
#geometry #algebraic-geometry #reference-request #triangles #coordinate-systems
66
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Tensor product over another tensor product

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#algebraic-geometry #commutative-algebra #tensor-products
156
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Brauer-Severi varieties as quotients of forms of $\text{GL}_2$

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#algebraic-geometry #algebraic-groups #galois-cohomology #reductive-groups
148
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General statement about how many lines in Euclidean space will determine a line

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#combinatorics #algebraic-geometry #intersection-theory #grassmannian
230
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Pullback of a scheme along the Frobenius morphism

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#algebraic-geometry #commutative-algebra #arithmetic-geometry
361
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About a proof using complex numbers that the antipodal map on $S^n$, $n$ odd, is homotopic to the identity map

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#differential-geometry #algebraic-geometry #differential-topology #geometric-topology

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