Publisher Correction to: Numerische Mathematik https://doi.org/10.1007/s00211-022-01316-w

In Section 2 of this article, in the sentence beginning “More precisely, we solve the problem…”, the variable ‘\(\widehat{{\varvec{f}}}\)’ was displayed incorrectly three times in normal font as ‘\(\widehat{f}\)’ when it should have been ‘\(\widehat{{\varvec{f}}}\)’ in bold font. The same mistake happened in Section 5 in the statement (three times) and proof (two times) of Theorem 3 and in the statements of Corollary 3 (three times) and Corollary 4 (three times).

In the Acknowledgements section of this article the project grant number relating to the Swiss National Science Foundation (SNSF) was missed and should have been 188577.