Timeline for Special case of Leray spectral sequence

6 events

when toggle format	what		by	license	comment
May 31, 2011 at 15:40	vote	accept	th.ng
May 31, 2011 at 15:29	comment	added	algori		.. However, it is true, as Dan says in his answer, that if the sheaf $R^{q_0}f_! \phi$ is constant, then everything works fine.
May 31, 2011 at 15:26	comment	added	algori		Here is a small remark: this statement is false without additional assumptions. Take e.g. the map $\mathbb{A}^1\setminus\{0\}\sqcup \{0\}\to \mathbb{A}^1$. All closed fibers are points, but the cohomology of the target is not the same as the cohomology of the source.
May 31, 2011 at 15:01	answer	added	Dan Petersen		timeline score: 3
May 31, 2011 at 14:53	history	edited	th.ng	CC BY-SA 3.0	deleted 4 characters in body
May 31, 2011 at 14:40	history	asked	th.ng	CC BY-SA 3.0