The definition mismatch of the double layer operator


I found that the definition of the double layer on the “Bempp book” Bempp book is not matched with the publication(E. V. Wout, P. Gelat, T. Betcke and S. Arridge, 138(5), JASA, 2015). I have checked the Bempp code, and found that it might be consistent with the later definition from JASA paper. The two definitions are parsed below. I hope my finding is useful for other users.

[Bempp book]

JASA Paper

Hi, the definition from the Bempp book is consistent with the implementation in the code.

Hi, Timo, thanks. I just found that my description is wrong. Your answer is correct.

Best wishes,