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math.GR2023
On approximate and actual reducibility of matrix groups
Bojan Kuzma, Mitja Mastnak, Heydar Radjavi +1
We introduce the notions of -approximate fixed point and weak -approximate fixed point. We show that for a group of unitary matrices even the existence of…
math.FA2023
Stability relations for Hilbert space operators and a problem of Kaplansky
Laurent W. Marcoux, Heydar Radjavi, Sascha Troscheit +1
In his monograph on Infinite Abelian Groups, I. Kaplansky raised three ``test problems" concerning their structure and multiplicity. As noted by Azoff, these problems make sense fo…