the sets a - b, b - a and AnB are mutually disjoint sets.use examples to observe this is true
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You are correct, and it's not so hard to find an example - say
[1101][1110]=[0111][1101]
In general playing around with 2×2 matrices should net you a solution pretty quickly - lots of matrices don't commute
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A natural example of a spectrum is a rainbow. ...
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