{"id":"https://openalex.org/W1994879029","doi":"https://doi.org/10.1002/malq.19780243103","title":"Some EC\u2211 Classes of Rings","display_name":"Some EC\u2211 Classes of Rings","publication_year":1978,"publication_date":"1978-01-01","ids":{"openalex":"https://openalex.org/W1994879029","doi":"https://doi.org/10.1002/malq.19780243103","mag":"1994879029"},"language":"en","primary_location":{"id":"doi:10.1002/malq.19780243103","is_oa":false,"landing_page_url":"https://doi.org/10.1002/malq.19780243103","pdf_url":null,"source":{"id":"https://openalex.org/S172351290","display_name":"Mathematical logic quarterly","issn_l":"0044-3050","issn":["0044-3050","0942-5616","1521-3870"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310320595","host_organization_name":"Wiley","host_organization_lineage":["https://openalex.org/P4310320595"],"host_organization_lineage_names":["Wiley"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Mathematical Logic Quarterly","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/A5037915949","display_name":"John T. Baldwin","orcid":"https://orcid.org/0000-0002-0185-5196"},"institutions":[],"countries":[],"is_corresponding":true,"raw_author_name":"John T. Baldwin","raw_affiliation_strings":["Chicago, Illinois (U.S.A.)"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Chicago, Illinois (U.S.A.)","institution_ids":[]}]}],"institutions":[],"countries_distinct_count":0,"institutions_distinct_count":0,"corresponding_author_ids":["https://openalex.org/A5037915949"],"corresponding_institution_ids":[],"apc_list":{"value":2900,"currency":"USD","value_usd":2900},"apc_paid":null,"fwci":0.0,"has_fulltext":false,"cited_by_count":1,"citation_normalized_percentile":{"value":0.12225549,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":null,"biblio":{"volume":"24","issue":"31-36","first_page":"489","last_page":"492"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11727","display_name":"Advanced Algebra and Logic","score":0.9934999942779541,"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/T11727","display_name":"Advanced Algebra and Logic","score":0.9934999942779541,"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/T11703","display_name":"Rings, Modules, and Algebras","score":0.988099992275238,"subfield":{"id":"https://openalex.org/subfields/2602","display_name":"Algebra and Number Theory"},"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/T11151","display_name":"Advanced Topology and Set Theory","score":0.9764999747276306,"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"}}],"keywords":[{"id":"https://openalex.org/keywords/ultraproduct","display_name":"Ultraproduct","score":0.6346185207366943},{"id":"https://openalex.org/keywords/servant","display_name":"Servant","score":0.4569580554962158},{"id":"https://openalex.org/keywords/citation","display_name":"Citation","score":0.44126245379447937},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.42029842734336853},{"id":"https://openalex.org/keywords/philosophy","display_name":"Philosophy","score":0.36213454604148865},{"id":"https://openalex.org/keywords/library-science","display_name":"Library science","score":0.3142601251602173},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.31138208508491516},{"id":"https://openalex.org/keywords/discrete-mathematics","display_name":"Discrete mathematics","score":0.28513532876968384},{"id":"https://openalex.org/keywords/programming-language","display_name":"Programming language","score":0.11869418621063232}],"concepts":[{"id":"https://openalex.org/C167930466","wikidata":"https://www.wikidata.org/wiki/Q1535225","display_name":"Ultraproduct","level":2,"score":0.6346185207366943},{"id":"https://openalex.org/C2777219063","wikidata":"https://www.wikidata.org/wiki/Q283086","display_name":"Servant","level":2,"score":0.4569580554962158},{"id":"https://openalex.org/C2778805511","wikidata":"https://www.wikidata.org/wiki/Q1713","display_name":"Citation","level":2,"score":0.44126245379447937},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.42029842734336853},{"id":"https://openalex.org/C138885662","wikidata":"https://www.wikidata.org/wiki/Q5891","display_name":"Philosophy","level":0,"score":0.36213454604148865},{"id":"https://openalex.org/C161191863","wikidata":"https://www.wikidata.org/wiki/Q199655","display_name":"Library science","level":1,"score":0.3142601251602173},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.31138208508491516},{"id":"https://openalex.org/C118615104","wikidata":"https://www.wikidata.org/wiki/Q121416","display_name":"Discrete mathematics","level":1,"score":0.28513532876968384},{"id":"https://openalex.org/C199360897","wikidata":"https://www.wikidata.org/wiki/Q9143","display_name":"Programming language","level":1,"score":0.11869418621063232}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1002/malq.19780243103","is_oa":false,"landing_page_url":"https://doi.org/10.1002/malq.19780243103","pdf_url":null,"source":{"id":"https://openalex.org/S172351290","display_name":"Mathematical logic quarterly","issn_l":"0044-3050","issn":["0044-3050","0942-5616","1521-3870"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310320595","host_organization_name":"Wiley","host_organization_lineage":["https://openalex.org/P4310320595"],"host_organization_lineage_names":["Wiley"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Mathematical Logic Quarterly","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":6,"referenced_works":["https://openalex.org/W1495370742","https://openalex.org/W1574134548","https://openalex.org/W1984343819","https://openalex.org/W2017769265","https://openalex.org/W2081275964","https://openalex.org/W4244948438"],"related_works":["https://openalex.org/W2899084033","https://openalex.org/W2748952813","https://openalex.org/W127953164","https://openalex.org/W3081460590","https://openalex.org/W4231226515","https://openalex.org/W2322382814","https://openalex.org/W4232745934","https://openalex.org/W2126189245","https://openalex.org/W3198614086","https://openalex.org/W1994879029"],"abstract_inverted_index":null,"counts_by_year":[],"updated_date":"2026-08-21T09:56:20.448147","created_date":"2025-10-10T00:00:00"}