Attaining strong diameter two property for infinite cardinals

Abstract

We extend the (attaining of) strong diameter two property to infinite cardinals. In particular, a Banach space has the 1-norming attaining strong diameter two property with respect to $\omega$ (1-ASD2P${}_{\omega }$ for short) if every convex series of slices of the unit ball intersects the unit sphere. We characterize $C(K)$ spaces and $L_1(\mu )$ spaces having the 1-ASD2P${}_{\omega }$. We establish dual implications between the 1-ASD2P${}_{\omega }$, $\omega$-octahedral norms and Banach spaces failing the $(-1)$-ball-covering property. The stability of these new properties under direct sums and tensor products is also investigated.

25 pages