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## Main Question or Discussion Point

Correspondence Principle states that the behavior of systems described by the theory of quantum mechanics (or by the old quantum theory) reproduces classical physics in the limit of large quantum numbers. In other words, it says that for large orbits and for large energies, quantum calculations must agree with classical calculations."

But is it applied for only one system (say a single atom or single system like the quantum oscillator), or is it also correct to say that the human body is not quantum because of the correspondence principle? Or a bicycle is not quantum because of the correspondence principle?

But is it applied for only one system (say a single atom or single system like the quantum oscillator), or is it also correct to say that the human body is not quantum because of the correspondence principle? Or a bicycle is not quantum because of the correspondence principle?