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I'm reading through Griffiths Intro to QM 2nd Ed. and when it comes to bound/scattering states (2.5) they say:

##E<0 \implies## bound state

##E>0 \implies## scattering state

Why doesn't this change depending on whether you have a positive or negative delta-function potential?

##E<0 \implies## bound state

##E>0 \implies## scattering state

Why doesn't this change depending on whether you have a positive or negative delta-function potential?

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