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I am going through the book Introduction to QM by D.Griffiths. In the third chapter the book says the eigen functions of the momentum operator do not belong to the Hilbert space ...... But the only condition that a vector belongs to the Hilbert vector space is

that the integral gives a value between intervals ...... and the function we get is also giving a finite value ...... i mean the constant remains ...... please help and correct if i am wrong ...... thanks

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# Eigen functions of momentum operator

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