KASH3 Ref - Index

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| ### Function Index ( grp^abl G, grp^abl H ) -> elt-ord^rat ### Description The index of the subgroup H in G, or zero if H is of infinite index. ### Examples x_a := AbelianGroup([20]); x_b := MaximalSubgroups(x_a)[2]; Index(x_a,x_b);
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