Hi All! Does anyone know about some books on QM over the net? I know there is Cohen Tannoudji's book, which is some kind of a bible in this topic, but for now I only want to feed my interest and to call up my knowladge in QM. I have been learning it at the university though, but that was a long time ago. So what I need is some kind of a hardcore tutorial. Does something like this even exist for free on the net, or do I have to buy the Cohen Tannoudji book instead? Any help would be appreciated. Thanks guys!