Let G be a group, and let H 0 = {e} < H 1 < <
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Let G be a group, and let H0 = {e} < H1 < ··· < Hn = G be a composition series for G. Let N be a normal subgroup of G, and let γ : G → G/N be the canonical map. Show that the distinct groups among γ[Hi] for i = 0, ··· , n, form a composition series for G/N.
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