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## Main Question or Discussion Point

Exclusion principle of fermions is a consequence that wave functions are only anti-symmetric. Wave functions of bosons are only symmetric. Those two possibilities are consequence that bosons (and fermions) are not distinct.

But how to derive, that particles with integer spins have symmetric wavefunctions and that particles with integer and half spins have antisymmetric wave functions. How to derive that particles of the same type are not distinctable? Symmetric and anti-symmetric wave-functions are the only options for not distinctable functions, this is understandable.

I read, for instance Feynmans "QED: The strange theory of light and matter", but, I think, he assumes the above facts, not derive them?

But how to derive, that particles with integer spins have symmetric wavefunctions and that particles with integer and half spins have antisymmetric wave functions. How to derive that particles of the same type are not distinctable? Symmetric and anti-symmetric wave-functions are the only options for not distinctable functions, this is understandable.

I read, for instance Feynmans "QED: The strange theory of light and matter", but, I think, he assumes the above facts, not derive them?