The two-ball property: transitivity and examples

@inproceedings{Pay1988TheTP,
  title={The two-ball property: transitivity and examples},
  author={Rafael Pay{\'a} and David Yost},
  year={1988}
}
The 2-ball property is shown to be transitive. Combining this with some results on the decomposability of convex bodies, we produce new examples of Banach spaces which contain proper semi- M -ideals. These semi- M -ideals are not hyperplanes, nor are they the direct sums of examples which are hyperplanes.