MathSciNet bibliographic data MR1195719 (94j:20043) 20F32 (20E05 20F28 53C23 57M07) Gersten, S. M. The automorphism group of a free group is not a ${\rm CAT}(0)$${\rm CAT}(0)$ group. Proc. Amer. Math. Soc. 121 (1994), no. 4, 999–1002. Article

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