{"id":"https://openalex.org/W2042259773","doi":"https://doi.org/10.1016/0304-3975(80)90040-7","title":"Eine Neue invariante f\u00fcr kontextfreie sprachen","display_name":"Eine Neue invariante f\u00fcr kontextfreie sprachen","publication_year":1980,"publication_date":"1980-05-01","ids":{"openalex":"https://openalex.org/W2042259773","doi":"https://doi.org/10.1016/0304-3975(80)90040-7","mag":"2042259773"},"language":"de","primary_location":{"id":"doi:10.1016/0304-3975(80)90040-7","is_oa":true,"landing_page_url":"https://doi.org/10.1016/0304-3975(80)90040-7","pdf_url":null,"source":{"id":"https://openalex.org/S90727058","display_name":"Theoretical Computer Science","issn_l":"0304-3975","issn":["0304-3975","1879-2294"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310320990","host_organization_name":"Elsevier BV","host_organization_lineage":["https://openalex.org/P4310320990"],"host_organization_lineage_names":["Elsevier BV"],"type":"journal"},"license":"cc-by-nc-nd","license_id":"https://openalex.org/licenses/cc-by-nc-nd","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Theoretical Computer Science","raw_type":"journal-article"},"type":"article","indexed_in":["crossref"],"open_access":{"is_oa":true,"oa_status":"hybrid","oa_url":"https://doi.org/10.1016/0304-3975(80)90040-7","any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5109802380","display_name":"G\u00fcnter Hotz","orcid":null},"institutions":[{"id":"https://openalex.org/I91712215","display_name":"Saarland University","ror":"https://ror.org/01jdpyv68","country_code":"DE","type":"education","lineage":["https://openalex.org/I91712215"]}],"countries":["DE"],"is_corresponding":true,"raw_author_name":"G\u00fcnter Hotz","raw_affiliation_strings":["Fachbereich Mathematik und Informatik, Universit\u00e4t des Saarlandes, 6600 Saarbr\u00fccken, F.R.G","Fachbereich Mathematik und Informatik, Universit\u00e4t des Saarlandes, 6600 Saarbr\u00fccken, F.R.G.#TAB#"],"affiliations":[{"raw_affiliation_string":"Fachbereich Mathematik und Informatik, Universit\u00e4t des Saarlandes, 6600 Saarbr\u00fccken, F.R.G","institution_ids":[]},{"raw_affiliation_string":"Fachbereich Mathematik und Informatik, Universit\u00e4t des Saarlandes, 6600 Saarbr\u00fccken, F.R.G.#TAB#","institution_ids":["https://openalex.org/I91712215"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":1,"corresponding_author_ids":["https://openalex.org/A5109802380"],"corresponding_institution_ids":["https://openalex.org/I91712215"],"apc_list":{"value":2690,"currency":"USD","value_usd":2690},"apc_paid":{"value":2690,"currency":"USD","value_usd":2690},"fwci":6.9471,"has_fulltext":false,"cited_by_count":23,"citation_normalized_percentile":{"value":0.96349441,"is_in_top_1_percent":false,"is_in_top_10_percent":true},"cited_by_percentile_year":{"min":89,"max":94},"biblio":{"volume":"11","issue":"1","first_page":"107","last_page":"116"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10181","display_name":"Natural Language Processing Techniques","score":0.972100019454956,"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"}},"topics":[{"id":"https://openalex.org/T10181","display_name":"Natural Language Processing Techniques","score":0.972100019454956,"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/T12881","display_name":"linguistics and terminology studies","score":0.925599992275238,"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/mathematics","display_name":"Mathematics","score":0.5174420475959778},{"id":"https://openalex.org/keywords/combinatorics","display_name":"Combinatorics","score":0.4185611605644226}],"concepts":[{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.5174420475959778},{"id":"https://openalex.org/C114614502","wikidata":"https://www.wikidata.org/wiki/Q76592","display_name":"Combinatorics","level":1,"score":0.4185611605644226}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1016/0304-3975(80)90040-7","is_oa":true,"landing_page_url":"https://doi.org/10.1016/0304-3975(80)90040-7","pdf_url":null,"source":{"id":"https://openalex.org/S90727058","display_name":"Theoretical Computer Science","issn_l":"0304-3975","issn":["0304-3975","1879-2294"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310320990","host_organization_name":"Elsevier BV","host_organization_lineage":["https://openalex.org/P4310320990"],"host_organization_lineage_names":["Elsevier BV"],"type":"journal"},"license":"cc-by-nc-nd","license_id":"https://openalex.org/licenses/cc-by-nc-nd","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Theoretical Computer Science","raw_type":"journal-article"}],"best_oa_location":{"id":"doi:10.1016/0304-3975(80)90040-7","is_oa":true,"landing_page_url":"https://doi.org/10.1016/0304-3975(80)90040-7","pdf_url":null,"source":{"id":"https://openalex.org/S90727058","display_name":"Theoretical Computer Science","issn_l":"0304-3975","issn":["0304-3975","1879-2294"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310320990","host_organization_name":"Elsevier BV","host_organization_lineage":["https://openalex.org/P4310320990"],"host_organization_lineage_names":["Elsevier BV"],"type":"journal"},"license":"cc-by-nc-nd","license_id":"https://openalex.org/licenses/cc-by-nc-nd","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Theoretical Computer Science","raw_type":"journal-article"},"sustainable_development_goals":[{"id":"https://metadata.un.org/sdg/4","score":0.5199999809265137,"display_name":"Quality Education"}],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":6,"referenced_works":["https://openalex.org/W299519334","https://openalex.org/W1505482284","https://openalex.org/W1524813958","https://openalex.org/W2058630951","https://openalex.org/W2148224873","https://openalex.org/W6630184299"],"related_works":["https://openalex.org/W1979597421","https://openalex.org/W2007980826","https://openalex.org/W4245490552","https://openalex.org/W2061531152","https://openalex.org/W3002753104","https://openalex.org/W2077600819","https://openalex.org/W1587224694","https://openalex.org/W2042127053","https://openalex.org/W2142036596","https://openalex.org/W2072657027"],"abstract_inverted_index":{"Let":[0],"G":[1,51,82],"=":[2,23],"(V,":[3],"T,":[4,21],"P,":[5],"S)":[6],"a":[7,77,86,110,113],"c.f.":[8,129],"grammar":[9,63,81],"and":[10],"F(V":[11,24],"\u2323":[12,20,25,33],"T)":[13,34],"the":[14,28,37,67,95,98,126],"free":[15],"group":[16,72],"generated":[17,39,105,115],"by":[18,36,40,76,112],"V":[19],"((G)":[22,45],"T/P":[26],"is":[27,59],"quotient":[29,108],"of":[30,62,97,109,128],"F":[31],"(V":[32],"factorized":[35],"relationsystem":[38],"P.":[41],"We":[42],"prove":[43],"that":[44],"only":[46],"depends":[47],"on":[48],"L(G)":[49],"if":[50],"has":[52],"no":[53],"superflous":[54],"variables.":[55],"This":[56,101],"means":[57],"(fx107-1(G)":[58],"an":[60,107],"invariant":[61],"transformations":[64],"which":[65],"preserve":[66],"language.":[68],"Each":[69],"finitely":[70,104,114],"representable":[71],"can":[73,90],"be":[74],"represented":[75],"one":[78,89],"sided":[79],"liner":[80],"as":[83],"((G).":[84],"In":[85],"straightforward":[87],"manner":[88],"compute":[91],"finite":[92],"basises":[93],"for":[94,125],"Alexander-ideals":[96],"groups":[99],"((G.":[100],"ideals":[102],"are":[103],"in":[106],"Polynomring":[111],"ideal.":[116],"Therefore":[117],"this":[118],"leads":[119],"to":[120],"effective":[121],"computable":[122],"necessary":[123],"conditions":[124],"equivalence":[127],"grammars.":[130]},"counts_by_year":[{"year":2018,"cited_by_count":1},{"year":2017,"cited_by_count":1},{"year":2015,"cited_by_count":1},{"year":2013,"cited_by_count":1}],"updated_date":"2025-11-06T03:46:38.306776","created_date":"2025-10-10T00:00:00"}