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- What do you need to establish that spin is a conserved quantity?

Hi.

Question as in the summary.

Spin has no obvious classical interpretation but it is often a conserved quantity and considered as some sort of angular momentum. What do you need to establish that spin is a conserved quantity? I'm finding references to situations where spin is not a conserved quantity in general but only in some processes. Hence, what is needed to assert conservation?

Any replies or references to existing discussions or proofs would save me time and be appreciated. Thank you for your time.

Question as in the summary.

Spin has no obvious classical interpretation but it is often a conserved quantity and considered as some sort of angular momentum. What do you need to establish that spin is a conserved quantity? I'm finding references to situations where spin is not a conserved quantity in general but only in some processes. Hence, what is needed to assert conservation?

Any replies or references to existing discussions or proofs would save me time and be appreciated. Thank you for your time.