let say I have a vector |a> and |b> and a transformation matrix A(adsbygoogle = window.adsbygoogle || []).push({});

What is the difference between <a|A|b> and <a|Ab>?

And also, I don't quite understand why <a|Ab> = <A+a|b>. Where does this identity come from?

Thanks!

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# B Bracket notation problem

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