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I am reading a paper where the author uses colons in the description of groups. Example (not verbatim): "This subgroup is isomorphic to (Z_5 X A_4):Z_2". Several subgroups are described in the same way (as (G_1 x G_2):G_3) throughout the paper.
I have seen the colon in G to indicate the index of a subgroup H, in G, but that doesn't seem to make sense in this context. Does anyone know what this means?
I have seen the colon in G to indicate the index of a subgroup H, in G, but that doesn't seem to make sense in this context. Does anyone know what this means?