Spanning via Cech Cohomology
  Plateau's problem is to find a surface with minimal area spanning a given boundary. In 1960, Reifenberg and Adams developed a definition for "span" using \v{C}ech homology, and variants of this definition have been used ever sense. However, limitations of \v{C}ech homology resulted in the lack of a natural definition for a boundary consisting of more than one component. The authors avoided this problem in an earlier paper for codimension one surfaces using linking numbers to define spanning sets. In this paper, we show how to use \v{C}ech cohomology to provide a similar definition for all dimensions and codimensions. 
Jenny Harrison, Harrison Pugh
math.DG