Hello, sorry if I'm the wrong place : I asked a question 3 days ago and didn't get an answer : http://math.stackexchange.com/questions/2128689/cohomology-of-a-local-system
So I was hesistating to put it on mathoverflow but maybe this is too basic for MO. Can someone say to me if the question is too basic or not and if not how to transfer the question to mathoverflow ? Thanks in advance !