- #1

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## Main Question or Discussion Point

The born rule, written in the following way:

P(ψ/[itex]\varphi[/itex])=|<ψ|[itex]\varphi[/itex]>|^2

As a consequence,

P(ψ/[itex]\varphi[/itex])=P([itex]\varphi[/itex]/ψ)

I dont see it as an obvious fact from real life, do you? Why does it happen? Is there any intuitive reasoning / experience behind this commutativity of states?

Thanks!

P(ψ/[itex]\varphi[/itex])=|<ψ|[itex]\varphi[/itex]>|^2

As a consequence,

P(ψ/[itex]\varphi[/itex])=P([itex]\varphi[/itex]/ψ)

I dont see it as an obvious fact from real life, do you? Why does it happen? Is there any intuitive reasoning / experience behind this commutativity of states?

Thanks!