Comment on "note on the derivative of the hyperbolic cotangent"

Details Comment on "note on the derivative of the hyperbolic cotangent" Comment on "note on the derivative of the hyperbolic cotangent"

2007-05-10

arxiv.org/abs/0705.1512v1

Physics

Quantum Physics

Scientific paper

In a couple of articles (Ford G W and O'Connell R F 1996 Nature 380 113 and 2002 J. Phys. A: Math. Gen. 35 4183) it was argued that the standard result for the derivative of the hyperbolic cotangent in the literature, d \coth y/dy = -{csch}^2 y is incomplete and the correct expression should have an additional term proportional to the Dirac delta function. The purpose of this paper is to demonstrate that this claim is incorrect.

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