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• W2884562456 abstract "Constructive algorithms, requiring no more than $2times 2$ matrix manipulations, are provided for finding the entries of the positive definite factor in the polar decomposition of matrices in sixteen groups preserving a bilinear form in dimension four, including the Lorentz and symplectic groups. This is used to find quaternionic representations for these groups analogous to that for the special orthogonal group.This is achieved by first characterizing positive definite matrices in these groups. For the groups whose signature matrix is a symmetric matrix in the quaternion tensor basis for 4x4 matrices, a completion procedure based on this observation leads to said computation of the polar decomposition, while for the Lorentz group this is achieved by passage to its double cover. Amongst byproducts we mention an elementary and constructive proof showing that positive definite matrices in such groups belong to the connected component of the identity." @default.
• W2884562456 created "2018-08-03" @default.
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• W2884562456 date "2018-07-16" @default.
• W2884562456 modified "2023-09-27" @default.
• W2884562456 title "Algorithms for the Polar Decomposition in Certain Groups and the Quaternions" @default.
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• W2884562456 hasPublicationYear "2018" @default.
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