Freely infinitely divisible R-diagonal elements remain closed under homogeneous noncommutative polynomials and, when bounded, have Brown measure support equal to the spectrum with a criterion for property (H).
On some properties of free commutators with semicircular variables
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Freely infinitely divisible $R$-diagonal elements and Brown measure
Freely infinitely divisible R-diagonal elements remain closed under homogeneous noncommutative polynomials and, when bounded, have Brown measure support equal to the spectrum with a criterion for property (H).