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M. next

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I was wondering if this equality in QM has a name or not.

It goes as follows:

llψ+øll^2 + llψ-øll^2 = 2llψll^2 + 2lløll^2

where: ψ and ø are wave functions in Hilbert's space.

If it doesn't specifically have a name, what is its significance in QM?

Thankis