can anyone tell me what one means by these bracket
Code:
[tex]
       \langle\psi(r)\psi^*(r) \rangle
      [/tex]
, is it integral or what?????and is there any idea how to calculate this integral
Code:
[tex]
       \int\int{\mid\langle\psi(r)\psi^*(s)\rangle\mid}^  2 dr ds
      [/tex]