List questions from projective-geometry

Published on 23 Nov 2020 - 0:53

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$G_2$ as the group of Isometries of a Projective Space

Published on 24 Nov 2020 - 19:46

206

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very ample divisors on curves using Riemann Roch Spaces

Published on 27 Mar 2026 - 1:44

498

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Is every positive definite matrix a positive definite kernel

Published on 25 Mar 2026 - 23:36

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Three Projective Cameras in the Same "Projective Frame" - What Can I Do With This Info?

Published on 26 Mar 2026 - 23:09

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Show that the Cross Ratio depends on $\lambda$.

Published on 01 Dec 2020 - 20:25

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For all $P\in S$ there is a line $L\subset S$ containing $P$. Then $S$ is a ruled surface.

Published on 03 Dec 2020 - 16:55

915

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Is there a standard method for image rectification by vanish points?

Published on 26 Mar 2026 - 19:37

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Isometries on the real projective plane

Published on 30 Mar 2026 - 6:29

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Special Case for Bézout Theorem

Published on 02 Apr 2026 - 8:20

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Show that the genus of the projective curve $x^n_1 = x_2x^{n-1}_0 - x^n_2$ is $(n-1)(n-2)/2$.

Published on 05 Dec 2020 - 18:32

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How is $R$ related to $\text{Proj}(R / \mathfrak{m} \oplus \mathfrak{m} / \mathfrak{m}^2 \cdots ) $?

Published on 07 Dec 2020 - 0:38

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Part (a) of Exercise 5.14 in Chapter II of Hartshorne: Show that $\bigoplus_{n\geq 0}\Gamma(X,\mathcal{O}_X(n))$ is the integral closure of $S$.

Published on 02 Apr 2026 - 8:19

178

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Zeroes of homogeneous polynomial on projective curve

Published on 26 Mar 2026 - 9:46

154

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What is known about collineation groups in general?

Published on 25 Mar 2026 - 10:52

List Question

Why do projective bases need $n+2$ points?

$G_2$ as the group of Isometries of a Projective Space

very ample divisors on curves using Riemann Roch Spaces

Is every positive definite matrix a positive definite kernel

Three Projective Cameras in the Same "Projective Frame" - What Can I Do With This Info?

Show that the Cross Ratio depends on $\lambda$.

For all $P\in S$ there is a line $L\subset S$ containing $P$. Then $S$ is a ruled surface.

Is there a standard method for image rectification by vanish points?

Isometries on the real projective plane

Special Case for Bézout Theorem

Show that the genus of the projective curve $x^n_1 = x_2x^{n-1}_0 - x^n_2$ is $(n-1)(n-2)/2$.

How is $R$ related to $\text{Proj}(R / \mathfrak{m} \oplus \mathfrak{m} / \mathfrak{m}^2 \cdots ) $?

Part (a) of Exercise 5.14 in Chapter II of Hartshorne: Show that $\bigoplus_{n\geq 0}\Gamma(X,\mathcal{O}_X(n))$ is the integral closure of $S$.

Zeroes of homogeneous polynomial on projective curve

What is known about collineation groups in general?

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