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The Disk Covering Problem is a combinatorial optimization problem related to covering a set of points in a multidimensional space using a minimal number of disks (or circles in 2D). The main goal is to determine the smallest number of disks of a given radius needed to cover all points in a specified area or space.

Oriol Valls could refer to several things, but without additional context, it's difficult to pinpoint what you mean specifically. It might be a person's name and could refer to an individual notable in a certain field, such as business, academia, sports, or arts.

Oscar W. Greenberg is a notable figure in the field of mathematics, particularly recognized for his contributions to the study of combinatorial designs and graph theory. He has published research and worked on various mathematical problems and theories.