MathSciNet bibliographic data MR2439428 (2009f:20060) 20F65 (46C05 46T99 51F99) Austin, Tim; Naor, Assaf; Peres, Yuval The wreath product of $\Bbb Z$$\Bbb Z$ with $\Bbb Z$$\Bbb Z$ has Hilbert compression exponent $\frac{2}{3}$$\frac{2}{3}$. Proc. Amer. Math. Soc. 137 (2009), no. 1, 85–90. Article

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