{"id":"https://openalex.org/W2013317804","doi":"https://doi.org/10.1007/bf02280809","title":"Combinatorial systems defined over one- and two-letter alphabets","display_name":"Combinatorial systems defined over one- and two-letter alphabets","publication_year":1975,"publication_date":"1975-03-01","ids":{"openalex":"https://openalex.org/W2013317804","doi":"https://doi.org/10.1007/bf02280809","mag":"2013317804"},"language":"de","primary_location":{"id":"doi:10.1007/bf02280809","is_oa":false,"landing_page_url":"https://doi.org/10.1007/bf02280809","pdf_url":null,"source":{"id":"https://openalex.org/S188076996","display_name":"Archive for Mathematical Logic","issn_l":"0933-5846","issn":["0933-5846","1432-0665"],"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":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Archiv f\u00fcr Mathematische Logik und Grundlagenforschung","raw_type":"journal-article"},"type":"article","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/A5050861892","display_name":"Charles E. Hughes","orcid":"https://orcid.org/0000-0002-2528-3380"},"institutions":[{"id":"https://openalex.org/I75027704","display_name":"University of Tennessee at Knoxville","ror":"https://ror.org/020f3ap87","country_code":"US","type":"education","lineage":["https://openalex.org/I75027704"]}],"countries":["US"],"is_corresponding":true,"raw_author_name":"Charles E. Hughes","raw_affiliation_strings":["Computer Science Department, University of Tennessee, 37920, Knoxville, Tn","Computer Science Dept., University of Tennessee, Knoxville"],"affiliations":[{"raw_affiliation_string":"Computer Science Department, University of Tennessee, 37920, Knoxville, Tn","institution_ids":[]},{"raw_affiliation_string":"Computer Science Dept., University of Tennessee, Knoxville","institution_ids":["https://openalex.org/I75027704"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5039650554","display_name":"W. E. Singletary","orcid":null},"institutions":[{"id":"https://openalex.org/I102502594","display_name":"Northern Illinois University","ror":"https://ror.org/012wxa772","country_code":"US","type":"education","lineage":["https://openalex.org/I102502594"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"W. E. Singletary","raw_affiliation_strings":["Mathematics Department, Northern Illinois University, 60115, De Kalb, Illinois","Mathematics Department, Northern Illinois University, De Kalb"],"affiliations":[{"raw_affiliation_string":"Mathematics Department, Northern Illinois University, 60115, De Kalb, Illinois","institution_ids":["https://openalex.org/I102502594"]},{"raw_affiliation_string":"Mathematics Department, Northern Illinois University, De Kalb","institution_ids":["https://openalex.org/I102502594"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":2,"corresponding_author_ids":["https://openalex.org/A5050861892"],"corresponding_institution_ids":["https://openalex.org/I75027704"],"apc_list":{"value":2390,"currency":"EUR","value_usd":2990},"apc_paid":null,"fwci":0.0,"has_fulltext":false,"cited_by_count":3,"citation_normalized_percentile":{"value":0.14994179,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":null,"biblio":{"volume":"17","issue":"1-2","first_page":"25","last_page":"33"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11567","display_name":"semigroups and automata theory","score":0.9998999834060669,"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":0.9998999834060669,"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/T12002","display_name":"Computability, Logic, AI Algorithms","score":0.9987999796867371,"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":0.9983999729156494,"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"}}],"keywords":[{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.7764592170715332},{"id":"https://openalex.org/keywords/degree","display_name":"Degree (music)","score":0.5975282788276672},{"id":"https://openalex.org/keywords/decision-problem","display_name":"Decision problem","score":0.5771453380584717},{"id":"https://openalex.org/keywords/discrete-mathematics","display_name":"Discrete mathematics","score":0.4583562910556793},{"id":"https://openalex.org/keywords/combinatorics","display_name":"Combinatorics","score":0.4425313472747803},{"id":"https://openalex.org/keywords/markov-chain","display_name":"Markov chain","score":0.42572903633117676},{"id":"https://openalex.org/keywords/algorithm","display_name":"Algorithm","score":0.24053460359573364},{"id":"https://openalex.org/keywords/statistics","display_name":"Statistics","score":0.09479430317878723}],"concepts":[{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.7764592170715332},{"id":"https://openalex.org/C2775997480","wikidata":"https://www.wikidata.org/wiki/Q586277","display_name":"Degree (music)","level":2,"score":0.5975282788276672},{"id":"https://openalex.org/C115988155","wikidata":"https://www.wikidata.org/wiki/Q3262192","display_name":"Decision problem","level":2,"score":0.5771453380584717},{"id":"https://openalex.org/C118615104","wikidata":"https://www.wikidata.org/wiki/Q121416","display_name":"Discrete mathematics","level":1,"score":0.4583562910556793},{"id":"https://openalex.org/C114614502","wikidata":"https://www.wikidata.org/wiki/Q76592","display_name":"Combinatorics","level":1,"score":0.4425313472747803},{"id":"https://openalex.org/C98763669","wikidata":"https://www.wikidata.org/wiki/Q176645","display_name":"Markov chain","level":2,"score":0.42572903633117676},{"id":"https://openalex.org/C11413529","wikidata":"https://www.wikidata.org/wiki/Q8366","display_name":"Algorithm","level":1,"score":0.24053460359573364},{"id":"https://openalex.org/C105795698","wikidata":"https://www.wikidata.org/wiki/Q12483","display_name":"Statistics","level":1,"score":0.09479430317878723},{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.0},{"id":"https://openalex.org/C24890656","wikidata":"https://www.wikidata.org/wiki/Q82811","display_name":"Acoustics","level":1,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1007/bf02280809","is_oa":false,"landing_page_url":"https://doi.org/10.1007/bf02280809","pdf_url":null,"source":{"id":"https://openalex.org/S188076996","display_name":"Archive for Mathematical Logic","issn_l":"0933-5846","issn":["0933-5846","1432-0665"],"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":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Archiv f\u00fcr Mathematische Logik und Grundlagenforschung","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[{"id":"https://metadata.un.org/sdg/4","score":0.4399999976158142,"display_name":"Quality Education"}],"awards":[],"funders":[],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":15,"referenced_works":["https://openalex.org/W1817451992","https://openalex.org/W1973752763","https://openalex.org/W1977949996","https://openalex.org/W1992652529","https://openalex.org/W1995181842","https://openalex.org/W2015965037","https://openalex.org/W2019222694","https://openalex.org/W2035867406","https://openalex.org/W2049922884","https://openalex.org/W2061867586","https://openalex.org/W2075328216","https://openalex.org/W2092354571","https://openalex.org/W2326418800","https://openalex.org/W2331518422","https://openalex.org/W4210905115"],"related_works":["https://openalex.org/W3161230432","https://openalex.org/W1487201914","https://openalex.org/W4367190712","https://openalex.org/W280458463","https://openalex.org/W3168382218","https://openalex.org/W1543051890","https://openalex.org/W1560182867","https://openalex.org/W3037532811","https://openalex.org/W2950587831","https://openalex.org/W4300559998"],"abstract_inverted_index":null,"counts_by_year":[],"updated_date":"2025-11-06T03:46:38.306776","created_date":"2025-10-10T00:00:00"}