Summary
The concept of weak semi-differentiability is strengthened by removing a defect from an earlier definition by Fonte and a serious weakness in the strengthened concept is demonstrated by a counter example.
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References
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Pian, J., Sharma, C.S. The weak semi-differentiability in quantum mechanics. Lett. Nuovo Cimento 40, 126–128 (1984). https://doi.org/10.1007/BF02747087
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DOI: https://doi.org/10.1007/BF02747087