@InProceedings{enqvist_et_al:LIPIcs.CALCO.2017.11, author = {Enqvist, Sebastian and Venema, Yde}, title = {{Disjunctive Bases: Normal Forms for Modal Logics}}, booktitle = {7th Conference on Algebra and Coalgebra in Computer Science (CALCO 2017)}, pages = {11:1--11:16}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-033-0}, ISSN = {1868-8969}, year = {2017}, volume = {72}, editor = {Bonchi, Filippo and K\"{o}nig, Barbara}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CALCO.2017.11}, URN = {urn:nbn:de:0030-drops-80357}, doi = {10.4230/LIPIcs.CALCO.2017.11}, annote = {Keywords: Modal logic, fixpoint logic, automata, coalgebra, graded modal logic, Lyndon theorem, uniform interpolation} }