Demonstrating Orthonormality of Eigenfunctions for De Cero-Spin Field

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lalo_u
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I need to demonstrate the orthonormality of the eigenfunctions for de cero-spin field.
I mean, <2k,3k> = 0 for example. nk denotes n particles with wave vector k.
I'm trying with the commnutation properties but i´m stuck in the middle of the process.

Is there any other thing i need?
 
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lalo_u said:
I need to demonstrate the orthonormality of the eigenfunctions for de cero-spin field.
I mean, <2k,3k> = 0 for example. nk denotes n particles with wave vector k.
I'm trying with the commnutation properties but i´m stuck in the middle of the process.

Is there any other thing i need?

This question is too minimal.

You might get more help if you post some of your work so far (in Latex).