- #1

daudaudaudau

- 302

- 0

[tex]

|\psi\rangle=\sum_{mn}c_{mn} a_m^\dagger a_n^\dagger |0\rangle

[/tex]

where [itex]c_{mn}[/itex] is a constant, [itex]a_n^\dagger[/itex] is the creation operator and [itex]|0\rangle[/itex] is the vacuum state. The only problem is that I want to sum over all PAIRS, and when I write the sum like this, all pairs are included twice, which is a mess.