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Jun 30, 2020 at 0:16 comment added C.T. Thank you so much for answering. It was very helpful. I was considering $A$ to be the matrices that are not conjugate to the central elements. Sorry I forgot to mention that.
Jun 30, 2020 at 0:14 vote accept C.T.
Jun 30, 2020 at 21:35
Jun 29, 2020 at 23:38 history answered R. van Dobben de Bruyn CC BY-SA 4.0