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15
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Determine conics by four points and a tangent line.

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#geometry #conic-sections #projective-geometry #quadrics
888
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SVD of orthogonal matrix and multiplying the left and right singular matrices?

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#linear-algebra #projective-geometry #svd #orthogonal-matrices
854
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Monster Model Theory

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#logic #model-theory #projective-geometry
111
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Fix points and invariant planes of projectivity not using coordinates

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#linear-algebra #geometry #projective-geometry #fixed-points
75
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How is this geometrical invariant called in English?

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#geometry #projective-geometry #affine-geometry #meta-math
1.7k
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Definition of dimension of a projective variety

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#algebraic-geometry #reference-request #commutative-algebra #book-recommendation #projective-geometry
1.5k
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Projective space definitions

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#algebraic-geometry #algebraic-topology #projective-geometry #projective-space #finite-geometry
77
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Construct the 4th point if we know the cross ratio!

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#projective-geometry
54
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$G(x_1,\dots, x_n)$ homogeneous, degree $d$ over algebraically closed field $K$. $[c_i,d_i]\in P^1_K$, then $G(c_iu+d_iv)\in K[u,v]$ is degree $d$?

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#abstract-algebra #algebraic-geometry #projective-geometry
216
Views

Does identifying opposite points in Euclidean space result in a smooth manifold?

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#general-topology #smooth-manifolds #projective-geometry #quotient-spaces
83
Views

Projection of circular motion on a perpendicular plane

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#geometry #dynamical-systems #projective-geometry #projective-space
1.6k
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Projection of a plane onto a surface of sphere

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#geometry #3d #projective-geometry
491
Views

Determine lines intersecting four skew lines in $\mathbb{P}^3$

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#projective-geometry #projective-space #cross-ratio
1.6k
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Does a projection matrix mean $P=P^T$?

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#projective-geometry #projection #projection-matrices
120
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contact geometry good reference

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#projective-geometry #symplectic-geometry #contact-topology

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