Second derivatives of norms and contractive complementation in vector-valued spaces

Bas Lemmens, Beata Randrianantoanina, Onno van Gaans

We consider 1-complemented subspaces (ranges of contractive projections) of vector-valued spaces ${\ell }_p(X)$, where $X$ is a Banach space with a 1-unconditional basis and $p \in (1…