However , in 2002 , Amnon Neeman constructed a counterexample .
Y In 1961 , Jan - Erik Roos published an incorrect theorem about the vanishing of the first derived functor of the inverse limit functor under certain general conditions .
In 2002 , Amnon Neeman constructed a counterexample .
Y In 1961 , Jan - Erik Roos published an incorrect theorem about the vanishing of the first derived functor of the inverse limit functor under certain general conditions .