List questions from projective-space

Published on 25 Mar 2026 - 17:18

310

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Convex functions up to reparametrization

Published on 21 Apr 2015 - 9:52

611

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Cohomology Group of $CP^2 \wedge CP^2$

Published on 21 Apr 2015 - 13:27

98

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Write $\mathbb{P}^3_{\mathbb{C}}$ as a union of disjoint lines

Published on 24 Apr 2015 - 9:30

73

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Can $\mathbb{R}\mathbb{P}^2$ be embedded into an orientable 3-manifold?

Published on 24 Apr 2015 - 9:41

220

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Help required with question about closed unit ball in Hilberts space and proving the projection formula

Published on 24 Apr 2015 - 18:57

457

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Blowup of six points in $\mathbb{P}^2$

Published on 25 Mar 2026 - 20:42

121

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WLOG doubt: why can we assume that two disjoint linear subspaces of dimension $n$ in $\mathbb{P}^{2n+1}$ are given by the following equations...

Published on 25 Apr 2015 - 20:48

432

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Point at Infinity of E.C. in Jacobian Coordinates

Published on 27 Apr 2015 - 16:45

203

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Find a projective variety $Z$ and closed subsets $X,Y \subseteq Z$ with $\dim(X)+\dim(Y) \geq \dim(Z)$ and $X \cap Y = \varnothing$

Published on 29 Apr 2015 - 1:09

55

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Prove $\Bbb C^2 \setminus \{0\}/\Bbb C^*$ is homeomorphic to $(\Bbb C^2 \setminus \{0\})/_{\sim f}$, where $f=\frac{qi\bar{q}}{|q|^2}$, $q$ quaternion

Published on 29 Apr 2015 - 4:21

699

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Orthogonal projection matrix P onto the range of a 3x2 matrix

Published on 29 Apr 2015 - 18:31

119

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Uniqueness of a projective transformation

Published on 01 May 2015 - 18:10

2.3k

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Is the action of the matrix UU^(t) always a projection? What can I say about I - UU^t?

Published on 06 May 2015 - 3:22

604

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Curvature for tautological bundle of projectivation

Published on 08 May 2015 - 12:37

List Question

Linear Systems And invertible Sheaf

Convex functions up to reparametrization

Cohomology Group of $CP^2 \wedge CP^2$

Write $\mathbb{P}^3_{\mathbb{C}}$ as a union of disjoint lines

Can $\mathbb{R}\mathbb{P}^2$ be embedded into an orientable 3-manifold?

Help required with question about closed unit ball in Hilberts space and proving the projection formula

Blowup of six points in $\mathbb{P}^2$

WLOG doubt: why can we assume that two disjoint linear subspaces of dimension $n$ in $\mathbb{P}^{2n+1}$ are given by the following equations...

Point at Infinity of E.C. in Jacobian Coordinates

Find a projective variety $Z$ and closed subsets $X,Y \subseteq Z$ with $\dim(X)+\dim(Y) \geq \dim(Z)$ and $X \cap Y = \varnothing$

Prove $\Bbb C^2 \setminus \{0\}/\Bbb C^*$ is homeomorphic to $(\Bbb C^2 \setminus \{0\})/_{\sim f}$, where $f=\frac{qi\bar{q}}{|q|^2}$, $q$ quaternion

Orthogonal projection matrix P onto the range of a 3x2 matrix

Uniqueness of a projective transformation

Is the action of the matrix UU^(t) always a projection? What can I say about I - UU^t?

Curvature for tautological bundle of projectivation

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