Von neumann and bell pointed out that basically the non isomorphic fact that the spectrum $$\sigma(A+B)!=\sigma(A)+\sigma(B)$$ leads to contradictions.(adsbygoogle = window.adsbygoogle || []).push({});

If we but replace the sum by $$A\otimes 1+1\otimes B$$ then the above inequality becomes an equality.

This would make things much easier.

We would get as eigenvalues for chsh integer values for example.

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# Is another definition of sum useful?

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