Question: 3.) (a) Show that if [A,H] = 0, then [eA,H] = 0. (b) Show also that e2iX = 1 for the Pauli operator X. (c)

3.) (a) Show that if [A,H] = 0, then [eA,H] = 0. (b) Show also that e2iX = 1 for the Pauli operator X. (c) Use the result in (b) to verify that the converse of (a) fails in general

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