Let K be a non-abelian subgroup of dihedral group and $H = K cap {1, a, a^2, ldots, a^{n-1}}$...
Channel: Roel Van de Paar
Date: 29/01/2021

Mathematics: Let K be a non-abelian subgroup of dihedral group and $H = K cap {1, a, a^2, ldots, a^{n-1}}$ then the index of H in K is 2

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