David Roberts
Grothendieck pretopology

This is to gather examples.

  • 𝒪\mathcal{O} is the pretopology of open covers
  • 𝒩\mathcal{N} is the pretopology of numerable covers
  • osos is the pretopology of open surjections
  • (more…)

Created on October 1, 2009 at 12:10:08. See the history of this page for a list of all contributions to it.