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Jul 21, 2018 at 15:42 comment added Nicky Hekster The bar notation is used to denote that one works in the quotient group $G/H$. $\bar{g}$ is the coset $g+H$ and $\bar{0}=0+H$.
Jul 20, 2018 at 10:47 comment added Yola What does it mean $\bar g = \bar {0}$?
Oct 28, 2013 at 13:33 history answered Nicky Hekster CC BY-SA 3.0