{"id":"https://openalex.org/W2014930599","doi":"https://doi.org/10.1016/0304-3975(95)00092-5","title":"Flatwords and Post Correspondence Problem","display_name":"Flatwords and Post Correspondence Problem","publication_year":1996,"publication_date":"1996-07-01","ids":{"openalex":"https://openalex.org/W2014930599","doi":"https://doi.org/10.1016/0304-3975(95)00092-5","mag":"2014930599"},"language":"en","primary_location":{"id":"doi:10.1016/0304-3975(95)00092-5","is_oa":false,"landing_page_url":"https://doi.org/10.1016/0304-3975(95)00092-5","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":null,"license_id":null,"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":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5054372678","display_name":"Tero Harju","orcid":null},"institutions":[{"id":"https://openalex.org/I112281704","display_name":"Research Council of Finland","ror":"https://ror.org/05k73zm37","country_code":"FI","type":"government","lineage":["https://openalex.org/I112281704"]},{"id":"https://openalex.org/I155660961","display_name":"University of Turku","ror":"https://ror.org/05vghhr25","country_code":"FI","type":"education","lineage":["https://openalex.org/I155660961"]}],"countries":["FI"],"is_corresponding":false,"raw_author_name":"Tero Harju","raw_affiliation_strings":["Academy of Finland and the Mathematics Department, University of Turku, 20500 Turku, Finland"],"affiliations":[{"raw_affiliation_string":"Academy of Finland and the Mathematics Department, University of Turku, 20500 Turku, Finland","institution_ids":["https://openalex.org/I112281704","https://openalex.org/I155660961"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5109130204","display_name":"Marjo Lipponen","orcid":null},"institutions":[{"id":"https://openalex.org/I112281704","display_name":"Research Council of Finland","ror":"https://ror.org/05k73zm37","country_code":"FI","type":"government","lineage":["https://openalex.org/I112281704"]},{"id":"https://openalex.org/I155660961","display_name":"University of Turku","ror":"https://ror.org/05vghhr25","country_code":"FI","type":"education","lineage":["https://openalex.org/I155660961"]}],"countries":["FI"],"is_corresponding":true,"raw_author_name":"Marjo Lipponen","raw_affiliation_strings":["Academy of Finland and the Mathematics Department, University of Turku, 20500 Turku, Finland"],"affiliations":[{"raw_affiliation_string":"Academy of Finland and the Mathematics Department, University of Turku, 20500 Turku, Finland","institution_ids":["https://openalex.org/I112281704","https://openalex.org/I155660961"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5112029209","display_name":"Alexandru Mateescu","orcid":null},"institutions":[{"id":"https://openalex.org/I112281704","display_name":"Research Council of Finland","ror":"https://ror.org/05k73zm37","country_code":"FI","type":"government","lineage":["https://openalex.org/I112281704"]},{"id":"https://openalex.org/I155660961","display_name":"University of Turku","ror":"https://ror.org/05vghhr25","country_code":"FI","type":"education","lineage":["https://openalex.org/I155660961"]}],"countries":["FI"],"is_corresponding":false,"raw_author_name":"Alexandru Mateescu","raw_affiliation_strings":["Academy of Finland and the Mathematics Department, University of Turku, 20500 Turku, Finland"],"affiliations":[{"raw_affiliation_string":"Academy of Finland and the Mathematics Department, University of Turku, 20500 Turku, Finland","institution_ids":["https://openalex.org/I112281704","https://openalex.org/I155660961"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":3,"corresponding_author_ids":["https://openalex.org/A5109130204"],"corresponding_institution_ids":["https://openalex.org/I112281704","https://openalex.org/I155660961"],"apc_list":{"value":2690,"currency":"USD","value_usd":2690},"apc_paid":null,"fwci":1.0301,"has_fulltext":false,"cited_by_count":3,"citation_normalized_percentile":{"value":0.75159584,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":null,"biblio":{"volume":"161","issue":"1-2","first_page":"93","last_page":"108"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"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"}},"topics":[{"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/T11130","display_name":"Coding theory and cryptography","score":0.9980000257492065,"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/T12029","display_name":"DNA and Biological Computing","score":0.9927999973297119,"subfield":{"id":"https://openalex.org/subfields/1312","display_name":"Molecular Biology"},"field":{"id":"https://openalex.org/fields/13","display_name":"Biochemistry, Genetics and Molecular Biology"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/decidability","display_name":"Decidability","score":0.8297967314720154},{"id":"https://openalex.org/keywords/alphabet","display_name":"Alphabet","score":0.7804942727088928},{"id":"https://openalex.org/keywords/prime","display_name":"Prime (order theory)","score":0.6568192839622498},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.6522007584571838},{"id":"https://openalex.org/keywords/connection","display_name":"Connection (principal bundle)","score":0.6298626661300659},{"id":"https://openalex.org/keywords/correspondence-problem","display_name":"Correspondence problem","score":0.5380425453186035},{"id":"https://openalex.org/keywords/combinatorics","display_name":"Combinatorics","score":0.5178894996643066},{"id":"https://openalex.org/keywords/discrete-mathematics","display_name":"Discrete mathematics","score":0.39371734857559204},{"id":"https://openalex.org/keywords/algebra-over-a-field","display_name":"Algebra over a field","score":0.3461807370185852},{"id":"https://openalex.org/keywords/pure-mathematics","display_name":"Pure mathematics","score":0.2516539990901947},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.23005375266075134},{"id":"https://openalex.org/keywords/linguistics","display_name":"Linguistics","score":0.18405216932296753},{"id":"https://openalex.org/keywords/artificial-intelligence","display_name":"Artificial intelligence","score":0.11878049373626709},{"id":"https://openalex.org/keywords/geometry","display_name":"Geometry","score":0.06629666686058044},{"id":"https://openalex.org/keywords/philosophy","display_name":"Philosophy","score":0.058142632246017456}],"concepts":[{"id":"https://openalex.org/C153269930","wikidata":"https://www.wikidata.org/wiki/Q430001","display_name":"Decidability","level":2,"score":0.8297967314720154},{"id":"https://openalex.org/C112876837","wikidata":"https://www.wikidata.org/wiki/Q837518","display_name":"Alphabet","level":2,"score":0.7804942727088928},{"id":"https://openalex.org/C184992742","wikidata":"https://www.wikidata.org/wiki/Q7243229","display_name":"Prime (order theory)","level":2,"score":0.6568192839622498},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.6522007584571838},{"id":"https://openalex.org/C13355873","wikidata":"https://www.wikidata.org/wiki/Q2920850","display_name":"Connection (principal bundle)","level":2,"score":0.6298626661300659},{"id":"https://openalex.org/C3004257","wikidata":"https://www.wikidata.org/wiki/Q17084606","display_name":"Correspondence problem","level":2,"score":0.5380425453186035},{"id":"https://openalex.org/C114614502","wikidata":"https://www.wikidata.org/wiki/Q76592","display_name":"Combinatorics","level":1,"score":0.5178894996643066},{"id":"https://openalex.org/C118615104","wikidata":"https://www.wikidata.org/wiki/Q121416","display_name":"Discrete mathematics","level":1,"score":0.39371734857559204},{"id":"https://openalex.org/C136119220","wikidata":"https://www.wikidata.org/wiki/Q1000660","display_name":"Algebra over a field","level":2,"score":0.3461807370185852},{"id":"https://openalex.org/C202444582","wikidata":"https://www.wikidata.org/wiki/Q837863","display_name":"Pure mathematics","level":1,"score":0.2516539990901947},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.23005375266075134},{"id":"https://openalex.org/C41895202","wikidata":"https://www.wikidata.org/wiki/Q8162","display_name":"Linguistics","level":1,"score":0.18405216932296753},{"id":"https://openalex.org/C154945302","wikidata":"https://www.wikidata.org/wiki/Q11660","display_name":"Artificial intelligence","level":1,"score":0.11878049373626709},{"id":"https://openalex.org/C2524010","wikidata":"https://www.wikidata.org/wiki/Q8087","display_name":"Geometry","level":1,"score":0.06629666686058044},{"id":"https://openalex.org/C138885662","wikidata":"https://www.wikidata.org/wiki/Q5891","display_name":"Philosophy","level":0,"score":0.058142632246017456}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1016/0304-3975(95)00092-5","is_oa":false,"landing_page_url":"https://doi.org/10.1016/0304-3975(95)00092-5","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":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Theoretical Computer Science","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[{"score":0.6299999952316284,"id":"https://metadata.un.org/sdg/4","display_name":"Quality Education"}],"awards":[],"funders":[],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":21,"referenced_works":["https://openalex.org/W4595237","https://openalex.org/W53596869","https://openalex.org/W96659326","https://openalex.org/W135574960","https://openalex.org/W185131448","https://openalex.org/W1527799312","https://openalex.org/W1529388494","https://openalex.org/W1602521140","https://openalex.org/W1970280218","https://openalex.org/W1976470420","https://openalex.org/W1983222532","https://openalex.org/W1985369251","https://openalex.org/W2046041498","https://openalex.org/W2073505157","https://openalex.org/W2116976042","https://openalex.org/W2167954650","https://openalex.org/W2204800026","https://openalex.org/W6603979455","https://openalex.org/W6605576113","https://openalex.org/W6642904493","https://openalex.org/W6688120804"],"related_works":["https://openalex.org/W2331020993","https://openalex.org/W2972379433","https://openalex.org/W4383764068","https://openalex.org/W1481826604","https://openalex.org/W1797057780","https://openalex.org/W1501430220","https://openalex.org/W3187762542","https://openalex.org/W1587864502","https://openalex.org/W2583753471","https://openalex.org/W4302436802"],"abstract_inverted_index":null,"counts_by_year":[],"updated_date":"2026-03-10T14:07:55.174380","created_date":"2025-10-10T00:00:00"}