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math-ph2021★ 7 cited
Wigner symmetries and Gleason's theorem
Peter Semrl
We prove an optimal version of Wigner's unitary-antiunitary theorem. The main tool in our proof is Gleason's theorem.
math.RA2021
The Waring Problem for Matrix Algebras
Matej Bresar, Peter Semrl
If a noncommutative polynomial is neither an identity nor a central polynomial of $\mathcal A=M_n(\C)$, then every trace zero matrix in can be written as a sum of…