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edited Jun 10 2010 at 19:35

I don't know Costello's reasons, but for example I find it convenient that the normalized chains on the one-point space are concentrated in degree zero (so the normalized chains functor takes the unit objet to unit object). Generally, when two construction have all the same good properties one tends to prefer the smaller one...

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answered Jun 10 2010 at 19:15

I don't know Costello's reasons, but for example I find it convenient that the normalized chains on the one-point space are concentrated in degree zero. Generally, when two construction have all the same good properties one tends to prefer the smaller one...