@InProceedings{atserias_et_al:LIPIcs.CSL.2018.7, author = {Atserias, Albert and Dawar, Anuj}, title = {{Definable Inapproximability: New Challenges for Duplicator}}, booktitle = {27th EACSL Annual Conference on Computer Science Logic (CSL 2018)}, pages = {7:1--7:21}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-088-0}, ISSN = {1868-8969}, year = {2018}, volume = {119}, editor = {Ghica, Dan R. and Jung, Achim}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CSL.2018.7}, URN = {urn:nbn:de:0030-drops-96742}, doi = {10.4230/LIPIcs.CSL.2018.7}, annote = {Keywords: Descriptive Compleixty, Hardness of Approximation, MAX SAT, Vertex Cover, Fixed-point logic with counting} }