Timeline for Is there an additive functor between abelian categories which isn't exact in the middle?
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| Nov 14, 2010 at 17:55 | comment | added | Geordie Williamson | Yes ... and the relation to Leonid's example is provided by MacPherson and Vilonen's "elementary construction of perverse sheaves", which shows that intermediate extension can be calculated at each step in the stratification by taking an image of a map of vector spaces. So in some sense these are the same example! | |
| Nov 14, 2010 at 17:53 | comment | added | Sam Lichtenstein | For an explication of this example, you could look at Ex. 2.7.1 of the survey ams.org/journals/bull/2009-46-04/S0273-0979-09-01260-9 | |
| Nov 14, 2010 at 14:13 | history | answered | Mikhail Bondarko | CC BY-SA 2.5 |