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Cross-ratio of points in the real projective plane

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#geometry #algebraic-geometry #projective-geometry #projective-space #cross-ratio
88
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Projective Transformation for two distinct vertices and a linear objective function

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#projective-geometry #projective-space #polytopes #discrete-geometry
226
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Define the set $E(\mathbb{Q})$ of $\mathbb{Q}$-rational points on an elliptic curve

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#elliptic-curves #rational-numbers #projective-space #homogeneous-equation
124
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What is the multidegree of a curve $C \subset \mathbb{P}^n \times \mathbb{P}^m$?

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#algebraic-geometry #projective-space #projective-schemes #moduli-space
589
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Homology group on the complex projective space

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#algebraic-topology #homology-cohomology #projective-space
88
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The Möbius Strip diffeomorphism

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#differential-topology #projective-space
89
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On a sheet of paper it is drawn a point $A$ and 2 lines $L_1$ and $L_2$ which intersect outside the sheet in a point B.

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#geometry #projective-geometry #projective-space
928
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Linear subspaces of projective space.

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#algebraic-geometry #projective-space #morphism
44
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Projection map from projective space is not well defined?

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#projective-space #projection
42
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A problem in multispace $\Bbb P^{n_1}\times \Bbb P^{n_2}\times ...\times \Bbb P^{n_r}\times \Bbb A^m$

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#algebraic-geometry #projective-space
389
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On the definition of degree of closed subschemes

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#algebraic-geometry #projective-space #hilbert-polynomial
1.4k
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What is the universal covering space of the projective line $\mathbb{RP}^1$?

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#algebraic-topology #projective-geometry #covering-spaces #projective-space
107
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Fundamental group of the complement of $3$ disjoint hypersurfaces in $\mathbb{C}P^2$

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#algebraic-topology #projective-space #fundamental-groups
121
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what do you call a circle with every number around it?

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#sequences-and-series #terminology #circles #projective-space
728
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Degree of zero dimensional schemes in projective space

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#algebraic-geometry #schemes #projective-space #projective-schemes

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