Abstract
In a previous paper (Juntunen and Stenberg in Math Comput 78:1353–1374, 2009) we have extended Nitsche’s method (in: Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg 1970/71) for the Poisson equation with general Robin boundary conditions. The analysis required that the solution is in \(H^{s}\), with \(s>3/2\). Here we give an improved error analysis using a technique proposed by Gudi (Math Comput 79:2169–2189 2010).

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Lüthen, N., Juntunen, M. & Stenberg, R. An improved a priori error analysis of Nitsche’s method for Robin boundary conditions. Numer. Math. 138, 1011–1026 (2018). https://doi.org/10.1007/s00211-017-0927-1
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DOI: https://doi.org/10.1007/s00211-017-0927-1