Currently, I am working on Thermal Quantum Field Theory.(adsbygoogle = window.adsbygoogle || []).push({});

In the introduction to that, many authors point out that infinitely many degrees of freedom and infinite volume are special.

In one reference that I am reading said "The famous equivalence between the Heisenberg and the Schro ̈dinger picture simply breaks down" when the degrees of freedom are infinite.

Could you explain these statements more concretely?

Thank you

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# Infinite degrees of freedom

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