=+26.9. Use characteristic functions for a simple proof that the family of Cauch. distributions defined by (20.45)

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=+26.9. Use characteristic functions for a simple proof that the family of Cauch.

distributions defined by (20.45) is closed under convolution; compare th argument in Problem 20.14(a). Do the same for the normal distributic

(compare Example 20.6) and for the Poisson and gamma distributions.

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