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Groups and FieldsMediumCosets and Lagrange's Theorem

Cosets and Lagrange's Theorem · Medium problem

In S4S_4, let H=⟨(123)⟩={e,(123),(132)}H = \langle(123)\rangle = \{e,(123),(132)\}. Compute the left coset (124)H(124)H. Is (142)(142) one of its elements?