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Your search keyword '"Hermitian matrix"' showing total 3 results
3 results on '"Hermitian matrix"'

1. On projections of free semialgebraic sets.

Author

Drescher, Tom, Netzer, Tim, and Thom, Andreas

Subjects
*SEMIALGEBRAIC sets, *NONCOMMUTATIVE algebras
Abstract

We examine to what extent a projection theorem is possible in the non-commutative (free) setting. We first review and extend some results that count against a full free projection theorem. We then obtain a weak version of the projection theorem: projections along linear and separated variables yield semialgebraically parametrised free semi-algebraic sets. [ABSTRACT FROM AUTHOR]

Published
2023
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2. On projections of free semialgebraic sets.

Author

Drescher, Tom, Netzer, Tim, and Thom, Andreas

Subjects
*SEMIALGEBRAIC sets, *NONCOMMUTATIVE algebras
Abstract

We examine to what extent a projection theorem is possible in the non-commutative (free) setting. We first review and extend some results that count against a full free projection theorem. We then obtain a weak version of the projection theorem: projections along linear and separated variables yield semialgebraically parametrised free semi-algebraic sets. [ABSTRACT FROM AUTHOR]

Published
2023
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3. Continuous space-time transformations.

Author

Pazzis, Clément de Seguins and Šemrl, Peter

Subjects
*SPACETIME, *MINKOWSKI space, *LORENTZ transformations, *POINCARE maps (Mathematics), *LIGHT cones
Abstract

We prove that every continuous map acting on the four-dimensional Minkowski space and preserving light cones in one direction only is either a Poincaré similarity, that is, a product of a Lorentz transformation and a dilation, or it is of a very special degenerate form. [ABSTRACT FROM AUTHOR]

Published
2018
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