{"id":"https://openalex.org/W1842686199","doi":"https://doi.org/10.1007/978-3-642-03351-3_23","title":"Compressed Word Problems in HNN-Extensions and Amalgamated Products","display_name":"Compressed Word Problems in HNN-Extensions and Amalgamated Products","publication_year":2009,"publication_date":"2009-01-01","ids":{"openalex":"https://openalex.org/W1842686199","doi":"https://doi.org/10.1007/978-3-642-03351-3_23","mag":"1842686199"},"language":"en","primary_location":{"id":"doi:10.1007/978-3-642-03351-3_23","is_oa":false,"landing_page_url":"https://doi.org/10.1007/978-3-642-03351-3_23","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/A5026367573","display_name":"Niko Haubold","orcid":null},"institutions":[{"id":"https://openalex.org/I926574661","display_name":"Leipzig University","ror":"https://ror.org/03s7gtk40","country_code":"DE","type":"education","lineage":["https://openalex.org/I926574661"]}],"countries":["DE"],"is_corresponding":true,"raw_author_name":"Niko Haubold","raw_affiliation_strings":["Institut f\u00fcr Informatik, Universit\u00e4t Leipzig, Germany","Institut f\u00fcr Informatik, Universit\u00e4t Leipzig#TAB#"],"affiliations":[{"raw_affiliation_string":"Institut f\u00fcr Informatik, Universit\u00e4t Leipzig, Germany","institution_ids":["https://openalex.org/I926574661"]},{"raw_affiliation_string":"Institut f\u00fcr Informatik, Universit\u00e4t Leipzig#TAB#","institution_ids":["https://openalex.org/I926574661"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5005500210","display_name":"Markus Lohrey","orcid":"https://orcid.org/0000-0002-4680-7198"},"institutions":[{"id":"https://openalex.org/I926574661","display_name":"Leipzig University","ror":"https://ror.org/03s7gtk40","country_code":"DE","type":"education","lineage":["https://openalex.org/I926574661"]}],"countries":["DE"],"is_corresponding":false,"raw_author_name":"Markus Lohrey","raw_affiliation_strings":["Institut f\u00fcr Informatik, Universit\u00e4t Leipzig, Germany","Institut f\u00fcr Informatik, Universit\u00e4t Leipzig#TAB#"],"affiliations":[{"raw_affiliation_string":"Institut f\u00fcr Informatik, Universit\u00e4t Leipzig, Germany","institution_ids":["https://openalex.org/I926574661"]},{"raw_affiliation_string":"Institut f\u00fcr Informatik, Universit\u00e4t Leipzig#TAB#","institution_ids":["https://openalex.org/I926574661"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":2,"corresponding_author_ids":["https://openalex.org/A5026367573"],"corresponding_institution_ids":["https://openalex.org/I926574661"],"apc_list":{"value":5000,"currency":"EUR","value_usd":5392},"apc_paid":null,"fwci":0.6517,"has_fulltext":false,"cited_by_count":2,"citation_normalized_percentile":{"value":0.72070957,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":90,"max":94},"biblio":{"volume":null,"issue":null,"first_page":"237","last_page":"249"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11567","display_name":"semigroups and automata theory","score":0.9991999864578247,"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":0.9991999864578247,"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/T10304","display_name":"Geometric and Algebraic Topology","score":0.991100013256073,"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/T12002","display_name":"Computability, Logic, AI Algorithms","score":0.9882000088691711,"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"}}],"keywords":[{"id":"https://openalex.org/keywords/word","display_name":"Word (group theory)","score":0.7588351964950562},{"id":"https://openalex.org/keywords/word-problem","display_name":"Word problem (mathematics education)","score":0.7112665772438049},{"id":"https://openalex.org/keywords/extension","display_name":"Extension (predicate logic)","score":0.7077488303184509},{"id":"https://openalex.org/keywords/turing","display_name":"Turing","score":0.6758874654769897},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.6727819442749023},{"id":"https://openalex.org/keywords/free-product","display_name":"Free product","score":0.5665680170059204},{"id":"https://openalex.org/keywords/base","display_name":"Base (topology)","score":0.5145472884178162},{"id":"https://openalex.org/keywords/polynomial","display_name":"Polynomial","score":0.4594183564186096},{"id":"https://openalex.org/keywords/turing-machine","display_name":"Turing machine","score":0.43214672803878784},{"id":"https://openalex.org/keywords/arithmetic","display_name":"Arithmetic","score":0.3413558602333069},{"id":"https://openalex.org/keywords/algorithm","display_name":"Algorithm","score":0.32569605112075806},{"id":"https://openalex.org/keywords/algebra-over-a-field","display_name":"Algebra over a field","score":0.324089378118515},{"id":"https://openalex.org/keywords/group","display_name":"Group (periodic table)","score":0.24857014417648315},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.2360926866531372},{"id":"https://openalex.org/keywords/programming-language","display_name":"Programming language","score":0.19299659132957458},{"id":"https://openalex.org/keywords/pure-mathematics","display_name":"Pure mathematics","score":0.13673031330108643},{"id":"https://openalex.org/keywords/chemistry","display_name":"Chemistry","score":0.0789555013179779},{"id":"https://openalex.org/keywords/geometry","display_name":"Geometry","score":0.0465300977230072}],"concepts":[{"id":"https://openalex.org/C90805587","wikidata":"https://www.wikidata.org/wiki/Q10944557","display_name":"Word (group theory)","level":2,"score":0.7588351964950562},{"id":"https://openalex.org/C90988201","wikidata":"https://www.wikidata.org/wiki/Q255912","display_name":"Word problem (mathematics education)","level":2,"score":0.7112665772438049},{"id":"https://openalex.org/C2778029271","wikidata":"https://www.wikidata.org/wiki/Q5421931","display_name":"Extension (predicate logic)","level":2,"score":0.7077488303184509},{"id":"https://openalex.org/C9870796","wikidata":"https://www.wikidata.org/wiki/Q490481","display_name":"Turing","level":2,"score":0.6758874654769897},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.6727819442749023},{"id":"https://openalex.org/C47527751","wikidata":"https://www.wikidata.org/wiki/Q1454165","display_name":"Free product","level":3,"score":0.5665680170059204},{"id":"https://openalex.org/C42058472","wikidata":"https://www.wikidata.org/wiki/Q810214","display_name":"Base (topology)","level":2,"score":0.5145472884178162},{"id":"https://openalex.org/C90119067","wikidata":"https://www.wikidata.org/wiki/Q43260","display_name":"Polynomial","level":2,"score":0.4594183564186096},{"id":"https://openalex.org/C29248071","wikidata":"https://www.wikidata.org/wiki/Q163310","display_name":"Turing machine","level":3,"score":0.43214672803878784},{"id":"https://openalex.org/C94375191","wikidata":"https://www.wikidata.org/wiki/Q11205","display_name":"Arithmetic","level":1,"score":0.3413558602333069},{"id":"https://openalex.org/C11413529","wikidata":"https://www.wikidata.org/wiki/Q8366","display_name":"Algorithm","level":1,"score":0.32569605112075806},{"id":"https://openalex.org/C136119220","wikidata":"https://www.wikidata.org/wiki/Q1000660","display_name":"Algebra over a field","level":2,"score":0.324089378118515},{"id":"https://openalex.org/C2781311116","wikidata":"https://www.wikidata.org/wiki/Q83306","display_name":"Group (periodic table)","level":2,"score":0.24857014417648315},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.2360926866531372},{"id":"https://openalex.org/C199360897","wikidata":"https://www.wikidata.org/wiki/Q9143","display_name":"Programming language","level":1,"score":0.19299659132957458},{"id":"https://openalex.org/C202444582","wikidata":"https://www.wikidata.org/wiki/Q837863","display_name":"Pure mathematics","level":1,"score":0.13673031330108643},{"id":"https://openalex.org/C185592680","wikidata":"https://www.wikidata.org/wiki/Q2329","display_name":"Chemistry","level":0,"score":0.0789555013179779},{"id":"https://openalex.org/C2524010","wikidata":"https://www.wikidata.org/wiki/Q8087","display_name":"Geometry","level":1,"score":0.0465300977230072},{"id":"https://openalex.org/C134306372","wikidata":"https://www.wikidata.org/wiki/Q7754","display_name":"Mathematical analysis","level":1,"score":0.0},{"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/C45374587","wikidata":"https://www.wikidata.org/wiki/Q12525525","display_name":"Computation","level":2,"score":0.0}],"mesh":[],"locations_count":3,"locations":[{"id":"doi:10.1007/978-3-642-03351-3_23","is_oa":false,"landing_page_url":"https://doi.org/10.1007/978-3-642-03351-3_23","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"},{"id":"pmh:oai:CiteSeerX.psu:10.1.1.245.5730","is_oa":false,"landing_page_url":"http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.245.5730","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"http://arxiv.org/pdf/0811.3303v1.pdf","raw_type":"text"},{"id":"pmh:oai:CiteSeerX.psu:10.1.1.521.9664","is_oa":false,"landing_page_url":"http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.521.9664","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"https://www.informatik.uni-leipzig.de/~lohrey/09-CSR.pdf","raw_type":"text"}],"best_oa_location":null,"sustainable_development_goals":[],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":24,"referenced_works":["https://openalex.org/W657518228","https://openalex.org/W1486245824","https://openalex.org/W1510722254","https://openalex.org/W1516116134","https://openalex.org/W1536001468","https://openalex.org/W1537474368","https://openalex.org/W1546860696","https://openalex.org/W1551305199","https://openalex.org/W1556583142","https://openalex.org/W1557759443","https://openalex.org/W1597956802","https://openalex.org/W1837726034","https://openalex.org/W1980224569","https://openalex.org/W1987022760","https://openalex.org/W2008023303","https://openalex.org/W2024522546","https://openalex.org/W2026275056","https://openalex.org/W2051678254","https://openalex.org/W2076505256","https://openalex.org/W2087939252","https://openalex.org/W2328824725","https://openalex.org/W4212805042","https://openalex.org/W4285719527","https://openalex.org/W4292101339"],"related_works":["https://openalex.org/W4320718947","https://openalex.org/W4226435716","https://openalex.org/W2119244842","https://openalex.org/W3160192459","https://openalex.org/W4324016496","https://openalex.org/W2215138167","https://openalex.org/W4231495498","https://openalex.org/W4312201671","https://openalex.org/W4254404873","https://openalex.org/W2621831792"],"abstract_inverted_index":null,"counts_by_year":[{"year":2012,"cited_by_count":1}],"updated_date":"2026-04-05T17:49:38.594831","created_date":"2025-10-10T00:00:00"}