I've been reading about discrepancy theory and trying to understand some of the open problems in the field. Wikipedia has a list of some of the open problems, but the descriptions are terrible. In particular, I am curious about:
"Axis-parallel rectangles in dimensions three and higher (folklore)"
Curious if anyone knows what problem the author was referring to, i.e. if this is some famous topic that everyone in discrepancy knows of and if there is a good reference to look at? (Or is the above quote just nonsense?)