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I understand that in 1-D when E< V(minimum) there exist no physically acceptable solution to the Schrodinger Equation. I have been looking at delta potentials using Griffiths book. I follow his working for the delta potential well but when it comes to the potential barrier I don't understand where the mathematics shows that no bound solutions exist for the delta barrier. If anyone has this book can they point out the step at which the maths for the well shows that the barrier has no bound solutions ?