Resumen de Asymptotically isometric copies of c0 and l1 in quotients of Banach spaces

Dongyang Chen

• Let $X$ be a real Banach space that does not contain a copy of $\ell^1$. Then $X^\ast$ contains asymptotically sometric copies of $\ell^1$ if and only if $X$ has a quotient which is asymptotically isometric to $c_0$.