On the fixed point property in Banach spaces isomorphic to $c_0$

Abstract

We prove that every Banach space containing a subspace isomorphic to $\co$ fails the fixed point property. The proof is based on an amalgamation approach involving a suitable combination of known results and techniques, including James's distortion theorem, Ramsey's combinatorial theorem, Brunel-Sucheston spreading model techniques and Dowling, Lennard and Turett's fixed point methodology employed in their characterization of weak compactness in $\co$.

Unfortunately there is a gap in the proof of Theorem 3.2. The diagonal argument fails to prove inequality (iii), as it only works though spreading models