Addendum to: "Divergence of $$.... By Z. Ahmed, S. Kumar, D. Ghosh, J. A. Nathan; Eur. J. Phys. 39(2018)055402."

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Abstract
In an earlier article ( Eur. J. Phys. 39 055402), potential wells with discontinuous jump have been found to have the expectation value 〈 p 6 〉 to be divergent for all bound states. Here in this addendum, we prove and demonstrate that for continuous but non-differentiable wells it diverges for even states and converges for odd states; here, p denotes momentum. We present three exactly solvable models.

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