A 4D counter-example showing that DWCness does not imply CWCness in $n$-D
In Combinatorial image analysis: Proceedings of the 20th international workshop, IWCIA 2020, novi sad, serbia, july 16–18, 2020
Abstract In this paper, we prove that the two flavours of well-composedness called Continuous Well-Composedness (shortly CWCness), stating that the boundary of the continuous analog of a discrete set is a manifold, and Digital Well-Composedness (shortly DWCness), stating that a discrete set does not contain any critical configuration, are not equivalent in dimension 4. To prove this, we exhibit the example of a configuration of 8 tesseracts (4D cubes) sharing a common corner (vertex), which is DWC but not CWC.