3 citations · 4 across the 3 of their papers we have counts for
3 papers
math.AG2019★ 1 cited
Un adjoint
Daniel Ferrand
Given a scheme S and a flat morphism T \to S of finite presentation we define a surjective S-morphism to an {é}tale and separated S-scheme, which is universal in an obvious sense.…
math.AG2015★ 3 cited
Recoller pour séparer
Daniel Ferrand, Bruno Kahn
We introduce the notion of a separator for a morphism of schemes f:T\to S; in particular, it is universal among morphisms from T to separated S-schemes. A separator is a local isom…
math.AC2007
Un module inversible associé au ruban de Möbius, et quelques autres
Daniel Ferrand
After attaching explicitly to the Möbius strip an invertible module over the ring of real polynomial functions on the real circle, we expound as directly as possible the many faces…