title: Dieudonné plank
text: # Dieudonné plank
  
  In mathematics, the Dieudonné plank is a specific topological space introduced by Dieudonné (1944). It is an example of a metacompact space that is not paracompact.
  
  The notion has since been generalized (by Barr et al.) to that of an absolute CR-epic space.
  
  