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The period matrices and theta functions of Riemann
The period matrices and theta functions of Riemann

On the connection between the categorical and the - UvA-DARE
On the connection between the categorical and the - UvA-DARE

Dual Homogeneous Forms and Varieties of Power Sums
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The geometry of orthogonal groups over finite fields
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An Introduction to Algebra and Geometry via Matrix Groups

... theory of vector spaces over arbitrary fields, and bilinear forms on such vector spaces. We can then define the orthogonal and symplectic group with respect to the bilinear forms. The tools we introduce allow us to determine the generators for the general linear group, the orthogonal group, the symp ...
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Four-vector

In the theory of relativity, a four-vector or 4-vector is a vector in Minkowski space, a four-dimensional real vector space. It differs from a Euclidean vector in how its magnitude is determined. The transformations that preserve this magnitude are the Lorentz transformations, which include spatial rotations, boosts (a change by a constant velocity to another inertial reference frame), and temporal and spatial inversions. Regarded as a homogeneous space, the transformation group of Minkowski space is the Poincaré group, which adds to the Lorentz group the group of translations. The Lorentz group may be represented by 4×4 matrices.The article considers four-vectors in the context of special relativity. Although the concept of four-vectors also extends to general relativity, some of the results stated in this article require modification in general relativity.
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