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| related topics |
| {equation, function, exp} |
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Note on the derivative of the hyperbolic cotangent
G. W. Ford, R. F. O'Connell
abstract: In a letter to Nature (Ford G W and O'Connell R F 1996 Nature 380 113) we
presented a formula for the derivative of the hyperbolic cotangent that differs
from the standard one in the literature by an additional term proportional to
the Dirac delta function. Since our letter was necessarily brief, shortly after
its appearance we prepared a more extensive unpublished note giving a detailed
explanation of our argument. Since this note has been referenced in a recent
article (Estrada R and Fulling S A 2002 J. Phys. A: Math. Gen. 35 3079) we
think it appropriate that it now appear in print. We have made no alteration to
the original note.
- oai_identifier:
- oai:arXiv.org:quant-ph/0301073
- categories:
- quant-ph math-ph math.MP
- doi:
- 10.1088/0305-4470/35/18/313
- arxiv_id:
- quant-ph/0301073
- journal_ref:
- J.Phys.A 35, 4183(2002)
- created:
- 2003-01-15
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