{"id":"https://openalex.org/W3204544690","doi":"https://doi.org/10.1007/978-3-030-86593-1_26","title":"Complexity of Word Problems for\u00a0HNN-Extensions","display_name":"Complexity of Word Problems for\u00a0HNN-Extensions","publication_year":2021,"publication_date":"2021-01-01","ids":{"openalex":"https://openalex.org/W3204544690","doi":"https://doi.org/10.1007/978-3-030-86593-1_26","mag":"3204544690"},"language":"en","primary_location":{"id":"doi:10.1007/978-3-030-86593-1_26","is_oa":false,"landing_page_url":"https://doi.org/10.1007/978-3-030-86593-1_26","pdf_url":null,"source":{"id":"https://openalex.org/S106296714","display_name":"Lecture notes in computer science","issn_l":"0302-9743","issn":["0302-9743","1611-3349"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319900","host_organization_name":"Springer Science+Business Media","host_organization_lineage":["https://openalex.org/P4310319900","https://openalex.org/P4310319965"],"host_organization_lineage_names":["Springer Science+Business Media","Springer Nature"],"type":"book series"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Lecture Notes in Computer Science","raw_type":"book-chapter"},"type":"book-chapter","indexed_in":["crossref"],"open_access":{"is_oa":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5005500210","display_name":"Markus Lohrey","orcid":"https://orcid.org/0000-0002-4680-7198"},"institutions":[{"id":"https://openalex.org/I206895457","display_name":"University of Siegen","ror":"https://ror.org/02azyry73","country_code":"DE","type":"education","lineage":["https://openalex.org/I206895457"]}],"countries":["DE"],"is_corresponding":true,"raw_author_name":"Markus Lohrey","raw_affiliation_strings":["Universit\u00e4t Siegen, Siegen, Germany"],"affiliations":[{"raw_affiliation_string":"Universit\u00e4t Siegen, Siegen, Germany","institution_ids":["https://openalex.org/I206895457"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":1,"corresponding_author_ids":["https://openalex.org/A5005500210"],"corresponding_institution_ids":["https://openalex.org/I206895457"],"apc_list":{"value":5000,"currency":"EUR","value_usd":5392},"apc_paid":null,"fwci":0.0,"has_fulltext":false,"cited_by_count":0,"citation_normalized_percentile":{"value":0.20264317,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":null,"biblio":{"volume":null,"issue":null,"first_page":"371","last_page":"384"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10304","display_name":"Geometric and Algebraic Topology","score":0.9998000264167786,"subfield":{"id":"https://openalex.org/subfields/2608","display_name":"Geometry and Topology"},"field":{"id":"https://openalex.org/fields/26","display_name":"Mathematics"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T10304","display_name":"Geometric and Algebraic Topology","score":0.9998000264167786,"subfield":{"id":"https://openalex.org/subfields/2608","display_name":"Geometry and Topology"},"field":{"id":"https://openalex.org/fields/26","display_name":"Mathematics"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T11567","display_name":"semigroups and automata theory","score":0.9993000030517578,"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/T10849","display_name":"Finite Group Theory Research","score":0.9821000099182129,"subfield":{"id":"https://openalex.org/subfields/2607","display_name":"Discrete Mathematics and Combinatorics"},"field":{"id":"https://openalex.org/fields/26","display_name":"Mathematics"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/extension","display_name":"Extension (predicate logic)","score":0.825494647026062},{"id":"https://openalex.org/keywords/word","display_name":"Word (group theory)","score":0.7482096552848816},{"id":"https://openalex.org/keywords/word-problem","display_name":"Word problem (mathematics education)","score":0.7255221605300903},{"id":"https://openalex.org/keywords/vertex","display_name":"Vertex (graph theory)","score":0.5854573845863342},{"id":"https://openalex.org/keywords/group","display_name":"Group (periodic table)","score":0.5320160388946533},{"id":"https://openalex.org/keywords/time-complexity","display_name":"Time complexity","score":0.5086820721626282},{"id":"https://openalex.org/keywords/computational-complexity-theory","display_name":"Computational complexity theory","score":0.4919578731060028},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.4761383831501007},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.39652472734451294},{"id":"https://openalex.org/keywords/combinatorics","display_name":"Combinatorics","score":0.36165446043014526},{"id":"https://openalex.org/keywords/graph","display_name":"Graph","score":0.2649601101875305},{"id":"https://openalex.org/keywords/algorithm","display_name":"Algorithm","score":0.2491168975830078},{"id":"https://openalex.org/keywords/arithmetic","display_name":"Arithmetic","score":0.1505107581615448}],"concepts":[{"id":"https://openalex.org/C2778029271","wikidata":"https://www.wikidata.org/wiki/Q5421931","display_name":"Extension (predicate logic)","level":2,"score":0.825494647026062},{"id":"https://openalex.org/C90805587","wikidata":"https://www.wikidata.org/wiki/Q10944557","display_name":"Word (group theory)","level":2,"score":0.7482096552848816},{"id":"https://openalex.org/C90988201","wikidata":"https://www.wikidata.org/wiki/Q255912","display_name":"Word problem (mathematics education)","level":2,"score":0.7255221605300903},{"id":"https://openalex.org/C80899671","wikidata":"https://www.wikidata.org/wiki/Q1304193","display_name":"Vertex (graph theory)","level":3,"score":0.5854573845863342},{"id":"https://openalex.org/C2781311116","wikidata":"https://www.wikidata.org/wiki/Q83306","display_name":"Group (periodic table)","level":2,"score":0.5320160388946533},{"id":"https://openalex.org/C311688","wikidata":"https://www.wikidata.org/wiki/Q2393193","display_name":"Time complexity","level":2,"score":0.5086820721626282},{"id":"https://openalex.org/C179799912","wikidata":"https://www.wikidata.org/wiki/Q205084","display_name":"Computational complexity theory","level":2,"score":0.4919578731060028},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.4761383831501007},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.39652472734451294},{"id":"https://openalex.org/C114614502","wikidata":"https://www.wikidata.org/wiki/Q76592","display_name":"Combinatorics","level":1,"score":0.36165446043014526},{"id":"https://openalex.org/C132525143","wikidata":"https://www.wikidata.org/wiki/Q141488","display_name":"Graph","level":2,"score":0.2649601101875305},{"id":"https://openalex.org/C11413529","wikidata":"https://www.wikidata.org/wiki/Q8366","display_name":"Algorithm","level":1,"score":0.2491168975830078},{"id":"https://openalex.org/C94375191","wikidata":"https://www.wikidata.org/wiki/Q11205","display_name":"Arithmetic","level":1,"score":0.1505107581615448},{"id":"https://openalex.org/C178790620","wikidata":"https://www.wikidata.org/wiki/Q11351","display_name":"Organic chemistry","level":1,"score":0.0},{"id":"https://openalex.org/C185592680","wikidata":"https://www.wikidata.org/wiki/Q2329","display_name":"Chemistry","level":0,"score":0.0},{"id":"https://openalex.org/C2524010","wikidata":"https://www.wikidata.org/wiki/Q8087","display_name":"Geometry","level":1,"score":0.0},{"id":"https://openalex.org/C199360897","wikidata":"https://www.wikidata.org/wiki/Q9143","display_name":"Programming language","level":1,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1007/978-3-030-86593-1_26","is_oa":false,"landing_page_url":"https://doi.org/10.1007/978-3-030-86593-1_26","pdf_url":null,"source":{"id":"https://openalex.org/S106296714","display_name":"Lecture notes in computer science","issn_l":"0302-9743","issn":["0302-9743","1611-3349"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319900","host_organization_name":"Springer Science+Business Media","host_organization_lineage":["https://openalex.org/P4310319900","https://openalex.org/P4310319965"],"host_organization_lineage_names":["Springer Science+Business Media","Springer Nature"],"type":"book series"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Lecture Notes in Computer Science","raw_type":"book-chapter"}],"best_oa_location":null,"sustainable_development_goals":[],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":36,"referenced_works":["https://openalex.org/W70771486","https://openalex.org/W112671161","https://openalex.org/W636399398","https://openalex.org/W1541016965","https://openalex.org/W1545078593","https://openalex.org/W1557759443","https://openalex.org/W1577127871","https://openalex.org/W1591127925","https://openalex.org/W1936658532","https://openalex.org/W1967512719","https://openalex.org/W1971387267","https://openalex.org/W1974784510","https://openalex.org/W1978029823","https://openalex.org/W2002522693","https://openalex.org/W2009571139","https://openalex.org/W2030291064","https://openalex.org/W2052202432","https://openalex.org/W2059568104","https://openalex.org/W2060215977","https://openalex.org/W2065701704","https://openalex.org/W2073723685","https://openalex.org/W2078460168","https://openalex.org/W2079926883","https://openalex.org/W2089001949","https://openalex.org/W2104480106","https://openalex.org/W2256164813","https://openalex.org/W2316365877","https://openalex.org/W2328824725","https://openalex.org/W2334232972","https://openalex.org/W2570611167","https://openalex.org/W2888665464","https://openalex.org/W2963451732","https://openalex.org/W3100847198","https://openalex.org/W3131346071","https://openalex.org/W4235484205","https://openalex.org/W4240753253"],"related_works":["https://openalex.org/W2075768550","https://openalex.org/W3022218857","https://openalex.org/W2369178846","https://openalex.org/W2082716031","https://openalex.org/W1589381382","https://openalex.org/W961142965","https://openalex.org/W4300852638","https://openalex.org/W2951572367","https://openalex.org/W2266715429","https://openalex.org/W2183485841"],"abstract_inverted_index":null,"counts_by_year":[],"updated_date":"2025-11-06T03:46:38.306776","created_date":"2025-10-10T00:00:00"}