Daugavet- and Delta-points in absolute sums of Banach spaces

Rainis Haller, Katriin Pirk, Triinu Veeorg

A Daugavet-point (resp.~$\Delta$-point) of a Banach space is a norm one element $x$ for which every point in the unit ball (resp.~element $x$ itself) is in the closed convex hull of uni…