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This article studies the properties of positive definite, radial functions on free groups following the work of Haagerup and Knudby [Proc. Amer. Math. Soc. 143 (2015), pp. 1477–1489]. We obtain characterizations of radial functions with respect to the length on the free groups with infinite generators and the characterization of the positive definite, radial functions with respect to the length on the free real line with infinite generators for . We obtain a Lévy-Khintchine formula for length-radial conditionally negative functions as well.more » « less
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