@article{ern:hal-01273901, TITLE = {{A converse to Fortin's Lemma in Banach spaces}}, AUTHOR = {Ern, Alexandre and Guermond, Jean-Luc}, URL = {https://hal.science/hal-01273901}, JOURNAL = {{Comptes Rendus. Math{\'e}matique}}, PUBLISHER = {{Acad{\'e}mie des sciences (Paris)}}, VOLUME = {354}, NUMBER = {11}, PAGES = {1092-1095}, YEAR = {2016}, MONTH = Nov, DOI = {10.1016/j.crma.2016.09.013}, KEYWORDS = {finite elements ; surjective operators ; inf-sup condition ; duality}, PDF = {https://hal.science/hal-01273901v2/file/fortin_hal.pdf}, HAL_ID = {hal-01273901}, HAL_VERSION = {v2}, }