List questions from projective-space

Published on 26 Mar 2026 - 7:46

61

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Tangent space of $\mathbb{CP}^{2}$ at a point $l$.

Published on 14 Dec 2017 - 17:17

723

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Lee, intro to smooth manifolds, problem 2.6

Published on 20 Dec 2017 - 20:06

136

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Write a non-trivial element of $ H^2 (\mathbb{C}P^2 \backslash \{ x = 0 \})$

Published on 20 Dec 2017 - 20:24

170

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Lifting a char $p$ variety to char $0$

Published on 28 Mar 2026 - 6:40

641

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diffeomorphism between the complex line and the sphere

Published on 25 Mar 2026 - 19:01

182

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Formal definition of homogenous coordinates

Published on 30 Dec 2017 - 12:34

684

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Understanding central projection in projective geometry

Published on 31 Dec 2017 - 7:34

628

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Write lines as affine combinations of points

Published on 30 Mar 2026 - 2:48

153

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Projective plane and points in $\mathbb{A}^2 = \{z=1\}$

Published on 02 Jan 2018 - 21:30

931

Views

The Betti number of complex projective spaces

Published on 23 Feb 2026 - 5:42

72

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How to orthogonally project to boundary of the ball $\mathcal{B}_r(0)\triangleq\{Y\in\mathbb{R}^{n\times n}:\|Y\|_2<r\} $?

Published on 29 Mar 2026 - 19:14

34

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Properties of a function on $\mathbb{R}P(2)$

Published on 05 Jan 2018 - 3:45

1.1k

Views

Understanding projective ambiguity

Published on 07 Jan 2018 - 7:35

187

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Circle such that the one point compactification of the Klein bottle minus the circle is homeomorphic to $\mathbb{P}^2$

Published on 25 Mar 2026 - 19:09

List Question

Is $\Bbb P^1_k$ simply the blow up of $\operatorname{Spec}k$?

Tangent space of $\mathbb{CP}^{2}$ at a point $l$.

Lee, intro to smooth manifolds, problem 2.6

Write a non-trivial element of $ H^2 (\mathbb{C}P^2 \backslash \{ x = 0 \})$

Lifting a char $p$ variety to char $0$

diffeomorphism between the complex line and the sphere

Formal definition of homogenous coordinates

Understanding central projection in projective geometry

Write lines as affine combinations of points

Projective plane and points in $\mathbb{A}^2 = \{z=1\}$

The Betti number of complex projective spaces

How to orthogonally project to boundary of the ball $\mathcal{B}_r(0)\triangleq\{Y\in\mathbb{R}^{n\times n}:\|Y\|_2<r\} $?

Properties of a function on $\mathbb{R}P(2)$

Understanding projective ambiguity

Circle such that the one point compactification of the Klein bottle minus the circle is homeomorphic to $\mathbb{P}^2$

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