## GR9277 #50

collectedsoul
Posts: 16
Joined: Mon Jun 30, 2008 11:04 pm

### GR9277 #50

In what book do I find the theory behind this qs.? The qs is: http://grephysics.net/ans/9277/50

bfollinprm
Posts: 1203
Joined: Sat Nov 07, 2009 11:44 am

### Re: GR9277 #50

Shankar

kangaroo
Posts: 130
Joined: Fri Jan 13, 2012 5:31 am

### Re: GR9277 #50

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?

collectedsoul
Posts: 16
Joined: Mon Jun 30, 2008 11:04 pm

### Re: GR9277 #50

Will I find it in Griffiths?

blighter
Posts: 256
Joined: Thu Jan 26, 2012 6:30 pm

### Re: GR9277 #50

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.