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SNS COLLEGE OF TECHNOLOGY, COIMBATORE – 35
SNS COLLEGE OF TECHNOLOGY, COIMBATORE – 35

... Solenoid is a cylindrically shaped coil consisting of a large number of closely spaced turns of insulated wire wound usually on a non magnetic frame. If a long slender solenoid is bent into the form of a ring and thereby closed on itself it becomes a toroid. ...
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... a shortest vector. On the other side of the ledger, there is a symplectic structure on V associated with the chosen Hermitian form, and one has the action of the compact subgroup of G which preserves this form. There is a moment map associated with this action, and it turns out that the vanishing of ...
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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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