Scope of Pauli's Exclusion Principle

Aniket1
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What is the scope of Pauli's exclusion principle? When we say two particles in a system cannot have the same quantum state, how do we choose the system?
 
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Roughly speaking, at atomic scale, when quantum mechanics show its importance. The wave behavior of electron is significant at such scales.
 
Any system at all. Two fermions of the same type anywhere in the universe cannot be in the same state. (Of course if one of them is localized on Earth and the other localized on Mars, say, they are in different states!)
 
Bill_K said:
Any system at all. Two fermions of the same type anywhere in the universe cannot be in the same state. (Of course if one of them is localized on Earth and the other localized on Mars, say, they are in different states!)

Thank you
 

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