A fixed point theorem for L1 spaces
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- Bader, U., Gelander, T. & Monod, N. Invent. math. (2012) 189: 143. doi:10.1007/s00222-011-0363-2
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We prove a fixed point theorem for a family of Banach spaces including notably L1 and its non-commutative analogues. Several applications are given, e.g. the optimal solution to the “derivation problem” studied since the 1960s.