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Jun 9, 2010 at 6:29 comment added Thomas Kragh I really meant mine on the chain level - i write that $\alpha$ is a simplex generating (meant to say a simplex representing a generator).
Jun 8, 2010 at 20:52 comment added Tyler Lawson This is basically Thomas' answer except on the chain level, where you don't have to worry about interference from torsion.
Jun 8, 2010 at 20:40 history edited Tyler Lawson CC BY-SA 2.5
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Jun 8, 2010 at 20:34 history answered Tyler Lawson CC BY-SA 2.5