Hi, I some basic questions on the physical meaning of bra-ket notation. I have looked at a lot of material, and I have seen descriptions of the algebraic properties of bra-kets, and I have seen hints at it having meaning regarding the probability of events happening/state changes, but I can't seem to find an exact depiction of this relationship. Hopefully this will be an easy one. If anyone could just let me know which, if any, of my statements are true, it would be most appreciated. Thanks, and feel free to elaborate.