Abstract
The notion of slicely countably determined (SCD) sets was introduced in 2010 by A. Aviles, V. Kadets, M. Martin, J. Meri and V. Shepelska. We solve in the negative some natural questions about preserving being SCD by the operations of union, intersection and Minkowski sum. Moreover, we demonstrate that corresponding examples exist in every space with the Daugavet property and can be selected to be unit balls of some equivalent norms. We also demonstrate that almost SCD sets need not be SCD, thus answering a question posed by A. Aviles et al.
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