Question
Show that if AB
BA, then eA+BeAe, but if they do commute, then the relations hold. Hint:
Write out several terms for e4+B, e4, e and do the multiplication carefully

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Show that if AB BA, then eA+BeAe, but if they do commute, then the relations hold. Hint: Write out several terms for e4+B, e4, e and do the multiplication carefully

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