1. Stability of Cauchy–Stieltjes Kernel Families by Free and Boolean Convolutions Product.
- Author
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Alanzi, Ayed. R. A., Alshqaq, Shokrya S., and Fakhfakh, Raouf
- Abstract
Let F (ν j) = { Q m j ν j , m j ∈ (m − ν j , m + ν j) } , j = 1 , 2 , be two Cauchy–Stieltjes Kernel (CSK) families induced by non-degenerate compactly supported probability measures ν 1 and ν 2 . Introduce the set of measures F = F (ν 1) ⊞ F (ν 2) = { Q m 1 ν 1 ⊞ Q m 2 ν 2 , m 1 ∈ (m − ν 1 , m + ν 1) a n d m 2 ∈ (m − ν 2 , m + ν 2) }. We show that if F remains a CSK family, (i.e., F = F (μ) where μ is a non-degenerate compactly supported measure), then the measures μ , ν 1 and ν 2 are of the Marchenko–Pastur type measure up to affinity. A similar conclusion is obtained if we substitute (in the definition of F) the additive free convolution ⊞ by the additive Boolean convolution ⊎. The cases where the additive free convolution ⊞ is replaced (in the definition of F) by the multiplicative free convolution ⊠ or the multiplicative Boolean convolution ⨃ are also studied. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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