{"id":"https://openalex.org/W7166310975","doi":"https://doi.org/10.4204/eptcs.446.4","title":"Idefix-Free Languages and Their Application in External Contextual Grammars","display_name":"Idefix-Free Languages and Their Application in External Contextual Grammars","publication_year":2026,"publication_date":"2026-06-25","ids":{"openalex":"https://openalex.org/W7166310975","doi":"https://doi.org/10.4204/eptcs.446.4"},"language":"en","primary_location":{"id":"doi:10.4204/eptcs.446.4","doi":"https://doi.org/10.4204/eptcs.446.4","is_oa":true,"landing_page_url":"https://doi.org/10.4204/eptcs.446.4","pdf_url":null,"source":{"id":"https://openalex.org/S4210216316","display_name":"Electronic Proceedings in Theoretical Computer Science","issn_l":"2075-2180","issn":["2075-2180"],"is_oa":true,"is_in_doaj":true,"is_core":true,"listed_in":["cwts-core","doaj","norway-1"],"host_organization":"https://openalex.org/P4310318029","host_organization_name":"Open Publishing Association","host_organization_lineage":["https://openalex.org/P4310318029"],"host_organization_lineage_names":["Open Publishing Association"],"type":"journal"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Electronic Proceedings in Theoretical Computer Science","raw_type":"journal-article"},"volume":null,"type":"article","indexed_in":["arxiv","crossref","datacite","doaj"],"open_access":{"is_oa":true,"oa_status":"diamond","oa_url":"https://doi.org/10.4204/eptcs.446.4","any_repository_has_fulltext":true},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5107113793","display_name":"Marvin K\u00f6dding","orcid":"https://orcid.org/0009-0004-0979-8992","observed_orcids":["https://orcid.org/0009-0004-0979-8992"]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"Marvin K\u00f6dding","raw_affiliation_strings":["PH Heidelberg"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"PH Heidelberg","institution_ids":[]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5010363248","display_name":"Bianca Truthe","orcid":"https://orcid.org/0000-0003-0031-5275","observed_orcids":["https://orcid.org/0000-0003-0031-5275"]},"institutions":[{"id":"https://openalex.org/I200763008","display_name":"Justus-Liebig-Universit\u00e4t Gie\u00dfen","ror":"https://ror.org/033eqas34","country_code":"DE","type":"education","lineage":["https://openalex.org/I200763008"]}],"countries":["DE"],"is_corresponding":false,"raw_author_name":"Bianca Truthe","raw_affiliation_strings":["Universit\u00e4t Giessen"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Universit\u00e4t Giessen","institution_ids":["https://openalex.org/I200763008"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":1,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":null,"apc_paid":null,"fwci":0.0,"has_fulltext":true,"cited_by_count":0,"citation_normalized_percentile":{"value":0.49400976,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":null,"biblio":{"volume":"446","issue":null,"first_page":"53","last_page":"71"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11567","display_name":"semigroups and automata theory","score":1.0,"subfield":{"id":"https://openalex.org/subfields/1703","display_name":"Computational Theory and Mathematics"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T11567","display_name":"semigroups and automata theory","score":1.0,"subfield":{"id":"https://openalex.org/subfields/1703","display_name":"Computational Theory and Mathematics"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T11269","display_name":"Algorithms and Data Compression","score":0.0,"subfield":{"id":"https://openalex.org/subfields/1702","display_name":"Artificial Intelligence"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10034","display_name":"Syntax, Semantics, Linguistic Variation","score":0.0,"subfield":{"id":"https://openalex.org/subfields/1203","display_name":"Language and Linguistics"},"field":{"id":"https://openalex.org/fields/12","display_name":"Arts and Humanities"},"domain":{"id":"https://openalex.org/domains/2","display_name":"Social Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/subregular-languages","display_name":"subregular languages","score":0.765999972820282},{"id":"https://openalex.org/keywords/regular-languages","display_name":"regular languages","score":0.5260000228881836},{"id":"https://openalex.org/keywords/linguistic-hierarchy","display_name":"language hierarchy","score":0.699999988079071}],"concepts":[{"id":"https://openalex.org/C53893814","wikidata":"https://www.wikidata.org/wiki/Q7378909","display_name":"Rule-based machine translation","level":2,"score":0.6711000204086304},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.6647999882698059},{"id":"https://openalex.org/C29184939","wikidata":"https://www.wikidata.org/wiki/Q1134367","display_name":"Phrase structure grammar","level":4,"score":0.5224000215530396},{"id":"https://openalex.org/C154945302","wikidata":"https://www.wikidata.org/wiki/Q11660","display_name":"Artificial intelligence","level":1,"score":0.4675000011920929},{"id":"https://openalex.org/C204321447","wikidata":"https://www.wikidata.org/wiki/Q30642","display_name":"Natural language processing","level":1,"score":0.4496999979019165},{"id":"https://openalex.org/C81917197","wikidata":"https://www.wikidata.org/wiki/Q628760","display_name":"Selection (genetic algorithm)","level":2,"score":0.44209998846054077},{"id":"https://openalex.org/C41895202","wikidata":"https://www.wikidata.org/wiki/Q8162","display_name":"Linguistics","level":1,"score":0.41679999232292175},{"id":"https://openalex.org/C2780566098","wikidata":"https://www.wikidata.org/wiki/Q25295","display_name":"Language family","level":2,"score":0.3864000141620636},{"id":"https://openalex.org/C134083981","wikidata":"https://www.wikidata.org/wiki/Q1754022","display_name":"Tree-adjoining grammar","level":4,"score":0.35920000076293945},{"id":"https://openalex.org/C94922259","wikidata":"https://www.wikidata.org/wiki/Q33215","display_name":"Constructed language","level":2,"score":0.34529998898506165},{"id":"https://openalex.org/C125950753","wikidata":"https://www.wikidata.org/wiki/Q908674","display_name":"Context-sensitive grammar","level":4,"score":0.34450000524520874},{"id":"https://openalex.org/C199163288","wikidata":"https://www.wikidata.org/wiki/Q3065587","display_name":"Abstract family of languages","level":5,"score":0.33739998936653137},{"id":"https://openalex.org/C61673122","wikidata":"https://www.wikidata.org/wiki/Q7095059","display_name":"Ontology language","level":3,"score":0.329800009727478},{"id":"https://openalex.org/C146072743","wikidata":"https://www.wikidata.org/wiki/Q192161","display_name":"Formal language","level":2,"score":0.3100999891757965},{"id":"https://openalex.org/C195324797","wikidata":"https://www.wikidata.org/wiki/Q33742","display_name":"Natural language","level":2,"score":0.30309998989105225},{"id":"https://openalex.org/C199360897","wikidata":"https://www.wikidata.org/wiki/Q9143","display_name":"Programming language","level":1,"score":0.29260000586509705},{"id":"https://openalex.org/C195818886","wikidata":"https://www.wikidata.org/wiki/Q5421724","display_name":"Expressive power","level":2,"score":0.29179999232292175},{"id":"https://openalex.org/C97212296","wikidata":"https://www.wikidata.org/wiki/Q338047","display_name":"Context-free grammar","level":3,"score":0.29120001196861267},{"id":"https://openalex.org/C52370388","wikidata":"https://www.wikidata.org/wiki/Q752532","display_name":"Regular language","level":3,"score":0.2676999866962433},{"id":"https://openalex.org/C2779343474","wikidata":"https://www.wikidata.org/wiki/Q3109175","display_name":"Context (archaeology)","level":2,"score":0.2662000060081482},{"id":"https://openalex.org/C11164408","wikidata":"https://www.wikidata.org/wiki/Q18657800","display_name":"Second-generation programming language","level":4,"score":0.25369998812675476}],"mesh":[],"locations_count":3,"locations":[{"id":"doi:10.4204/eptcs.446.4","doi":"https://doi.org/10.4204/eptcs.446.4","is_oa":true,"landing_page_url":"https://doi.org/10.4204/eptcs.446.4","pdf_url":null,"source":{"id":"https://openalex.org/S4210216316","display_name":"Electronic Proceedings in Theoretical Computer Science","issn_l":"2075-2180","issn":["2075-2180"],"is_oa":true,"is_in_doaj":true,"is_core":true,"listed_in":["cwts-core","doaj","norway-1"],"host_organization":"https://openalex.org/P4310318029","host_organization_name":"Open Publishing Association","host_organization_lineage":["https://openalex.org/P4310318029"],"host_organization_lineage_names":["Open Publishing Association"],"type":"journal"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Electronic Proceedings in Theoretical Computer Science","raw_type":"journal-article"},{"id":"pmh:oai:arXiv.org:2606.26682","doi":null,"is_oa":true,"landing_page_url":"https://arxiv.org/abs/2606.26682","pdf_url":"https://arxiv.org/pdf/2606.26682","source":{"id":"https://openalex.org/S4306400194","display_name":"arXiv (Cornell University)","issn_l":"2331-8422","issn":["2331-8422"],"is_oa":true,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I205783295","host_organization_name":"Cornell University","host_organization_lineage":["https://openalex.org/I205783295"],"host_organization_lineage_names":[],"type":"repository"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":null,"raw_type":"text"},{"id":"doi:10.48550/arxiv.2606.26682","doi":"https://doi.org/10.48550/arxiv.2606.26682","is_oa":true,"landing_page_url":"https://doi.org/10.48550/arxiv.2606.26682","pdf_url":null,"source":{"id":"https://openalex.org/S4306400194","display_name":"arXiv (Cornell University)","issn_l":"2331-8422","issn":["2331-8422"],"is_oa":true,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I205783295","host_organization_name":"Cornell University","host_organization_lineage":["https://openalex.org/I205783295"],"host_organization_lineage_names":[],"type":"repository"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":null,"is_accepted":false,"is_published":null,"raw_source_name":null,"raw_type":"Preprint"}],"best_oa_location":{"id":"doi:10.4204/eptcs.446.4","doi":"https://doi.org/10.4204/eptcs.446.4","is_oa":true,"landing_page_url":"https://doi.org/10.4204/eptcs.446.4","pdf_url":null,"source":{"id":"https://openalex.org/S4210216316","display_name":"Electronic Proceedings in Theoretical Computer Science","issn_l":"2075-2180","issn":["2075-2180"],"is_oa":true,"is_in_doaj":true,"is_core":true,"listed_in":["cwts-core","doaj","norway-1"],"host_organization":"https://openalex.org/P4310318029","host_organization_name":"Open Publishing Association","host_organization_lineage":["https://openalex.org/P4310318029"],"host_organization_lineage_names":["Open Publishing Association"],"type":"journal"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Electronic Proceedings in Theoretical Computer Science","raw_type":"journal-article"},"sustainable_development_goals":[],"sustainable_development_goals_aurora":[{"id":"https://metadata.un.org/sdg/4","score":0.6061475276947021,"display_name":"Quality education"}],"study_designs":[],"awards":[],"funders":[],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":0,"referenced_works":[],"related_works":[],"abstract_inverted_index":{"In":[0,89],"this":[1,90],"paper,":[2],"we":[3,65,92],"continue":[4],"the":[5,8,19,67,70,78,87,94],"research":[6],"on":[7],"power":[9],"of":[10,18,21,46,69],"contextual":[11,75],"grammars":[12,76],"with":[13,77],"selection":[14],"languages":[15,30,47],"from":[16],"subfamilies":[17],"family":[20],"regular":[22],"languages.":[23],"We":[24],"investigate":[25],"infix-,":[26],"prefix-,":[27],"and":[28,36,61],"suffix-free":[29],"(referred":[31],"to":[32,41],"as":[33],"idefix-free":[34],"languages)":[35],"compare":[37,66],"such":[38],"language":[39,79,99],"families":[40,45,68,80],"some":[42],"other":[43],"subregular":[44],"(finite,":[48],"monoidal,":[49],"nilpotent,":[50],"combinational,":[51],"(symmetric)":[52],"definite,":[53],"ordered,":[54],"non-counting,":[55],"power-separating,":[56],"commutative,":[57],"circular,":[58],"union-free,":[59],"star,":[60],"comet":[62],"languages).":[63],"Further,":[64],"hierarchies":[71,96],"obtained":[72],"for":[73,86],"external":[74],"defined":[81],"by":[82,97],"these":[83],"new":[84,98],"types":[85],"selection.":[88],"way,":[91],"extend":[93],"existing":[95],"families.":[100]},"counts_by_year":[],"updated_date":"2026-09-29T14:09:16.559479","created_date":"2026-06-28T00:00:00"}
