On the complemented subspaces problem

@article{Lindenstrauss1971OnTC,
  title={On the complemented subspaces problem},
  author={J. Lindenstrauss and L. Tzafriri},
  journal={Israel Journal of Mathematics},
  year={1971},
  volume={9},
  pages={263-269}
}
A Banach space is isomorphic to a Hilbert space provided every closed subspace is complemented. A conditionally σ-complete Banach lattice is isomorphic to anLp-space (1≤p<∞) or toc0(Γ) if every closed sublattice is complemented. 
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