EntityQ638934· pop 6· linked from 9 articlesstar heightSign in to saveConnectionsnondeterministic finite automatonEntityalphabetEntityInternational Standard Book NumberEntitysetEntitydigital object identifierEntityInternational Standard Serial NumberEntitygraph theoryEntityregular expressionEntityunionEntityformal languageEntityCambridge University PressEntitycomplementEntitytheoretical computer scienceEntity𝑛-tupleEntityautomata theoryEntityQ22908627Entitydirected graphEntityalphabetEntityKleene starEntityconcatenationEntityCategoriesFormal languages