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May 27, 2011 at 10:03 comment added Fernando Muro Hi Bruno! Nice to see you here :-)
May 26, 2011 at 23:02 vote accept DamienC
May 26, 2011 at 22:58 comment added DamienC @Bruno: you are right. But the point is precisely that you don't always have a homotopy retract in case you work with a ring k (or with sheaves).
May 26, 2011 at 22:55 comment added Bruno V. @Fernando, Ok over a field one can always choose representatives of homology classes. But, if you are given a homotopy retract, then the transfer theorem works in any case, no matter the ground field being a field.
May 25, 2011 at 10:08 history answered Fernando Muro CC BY-SA 3.0