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- W4301144423 abstract "We show that the spectral theorem -- which we understand to be a statement that every self-adjoint matrix admits a certain type of canonical form under unitary similarity -- admits analogues over other $*$-algebras distinct from the complex numbers. If these $*$-algebras contain nilpotents, then it is shown that there is a consistent way in which many classic matrix decompositions -- such as the Singular Value Decomposition, the Takagi decomposition, the skew-Takagi decomposition, and the Jordan decomposition, among others -- are immediate consequences of these. If producing the relevant canonical form of a self-adjoint matrix were a subroutine in some programming language, then the corresponding classic matrix decomposition would be a 1-line invocation with no additional steps. We also suggest that by employing operator overloading in a programming language, a numerical algorithm for computing a unitary diagonalisation of a complex self-adjoint matrix would generalise immediately to solving problems like SVD or Takagi. While algebras without nilpotents (like the quaternions) allow for similar unifying behaviour, the classic matrix decompositions which they unify are never obtained as easily. In the process of doing this, we develop some spectral theory over Clifford algebras of the form $cl_{p,q,0}(mathbb R)$ and $cl_{p,q,1}(mathbb R)$ where the former is admittedly quite easy. We propose a broad conjecture about spectral theorems." @default.
- W4301144423 created "2022-10-04" @default.
- W4301144423 creator A5072103611 @default.
- W4301144423 date "2022-08-08" @default.
- W4301144423 modified "2023-09-26" @default.
- W4301144423 title "Unitary canonical forms over Clifford algebras, and an observed unification of some real-matrix decompositions" @default.
- W4301144423 doi "https://doi.org/10.48550/arxiv.2208.04272" @default.
- W4301144423 hasPublicationYear "2022" @default.
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