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My lecture said, two fermion can form a composite boson. two spin half plus together get 1.

Yes I agree, but i think thats depend on whose frame of reference.

say A and B is two fermions, C and D is another two fermions (observers). AB form a boson.

if:

AB C

or

ADB

basically, what I want illustrate is, C is far from AB, and D is close to AB.

C can treat AB as whole, i.e a composite boson.

BUT, D can not.

Am I right? helps please!

Thanks in advance