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compatible discretizations for maxwell equations
compatible discretizations for maxwell equations

Polarizability of a dielectric hemisphere
Polarizability of a dielectric hemisphere

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... so f φ ∈ L2 (X). Therefore, the multiplication operator Mφ : L2 (X) → L2 (X) given by Mφ f = f φ is well-defined, and the calculation above shows that kMφ f k2 ≤ kφk∞ kf k2 . Therefore Mφ is bounded, and kMφ k ≤ kφk∞ . If we assume that µ is σ-finite, then we can show that kMφ k = kφk∞ , as follows. ...
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... ) ⊂ M0 lies in a single orbit . . . . . . . . . . . π1 (Y, y0 ) is a group . . . . . . . . . . . . . . . . . . . π1 (Y, y0 ) ∼ = π(Y, y1 ) . . . . . . . . . . . . . . . . . . . SU (2) and SO(3) . . . . . . . . . . . . . . . . . . . . π1 (G) is abelian . . . . . . . . . . . . . . . . . . . . . π2 (X, ...
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the exponential representation of flows and the chronological calculus
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Chapter One - Princeton University Press

... eigenvalues are nonnegative. A is strictly positive if and only if all its eigenvalues are positive. (ii) A is positive if and only if it is Hermitian and all its principal minors are nonnegative. A is strictly positive if and only if all its principal minors are positive. (iii) A is positive if and ...
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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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