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### GR9277 #50

Posted: Mon Jul 22, 2013 7:51 am
In what book do I find the theory behind this qs.? The qs is: http://grephysics.net/ans/9277/50

### Re: GR9277 #50

Posted: Mon Jul 22, 2013 10:15 pm
Shankar

### Re: GR9277 #50

Posted: Mon Jul 22, 2013 11:38 pm
Well any qm textbook would demobstrate this fact basically.

Anyway qm is also known as matrix mechanics for a reason. The question is basically asking when does the order of observations not matter i.e. when is AB\psi=BA\psi for ALL \psi?

### Re: GR9277 #50

Posted: Tue Jul 23, 2013 9:47 am
Will I find it in Griffiths?

### Re: GR9277 #50

Posted: Tue Jul 23, 2013 11:26 am
collectedsoul wrote:Will I find it in Griffiths?
Sure.

In fact you don't even need a quantum mechanics text. All you need is a linear algebra text.