@article {10.1090/mcom/3748, AUTHOR = {Feischl, Michael}, TITLE = {Inf-sup stability implies quasi-orthogonality}, JOURNAL = {Math. Comp.}, FJOURNAL = {Mathematics of Computation}, VOLUME = {91}, YEAR = {2022}, MONTH = {sep}, NUMBER = {337}, PAGES = {2059--2094}, ISSN = {0025-5718}, DOI = {10.1090/mcom/3748}, URL = {https://doi.org/10.1090/mcom/3748}, }