{"id":"https://openalex.org/W1973712809","doi":"https://doi.org/10.1002/malq.19780241906","title":"Some Continuity Properties for Ultraproducts","display_name":"Some Continuity Properties for Ultraproducts","publication_year":1978,"publication_date":"1978-01-01","ids":{"openalex":"https://openalex.org/W1973712809","doi":"https://doi.org/10.1002/malq.19780241906","mag":"1973712809"},"language":"en","primary_location":{"id":"doi:10.1002/malq.19780241906","is_oa":false,"landing_page_url":"https://doi.org/10.1002/malq.19780241906","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/A5071569280","display_name":"Paul E. Cohen","orcid":null},"institutions":[{"id":"https://openalex.org/I4210165202","display_name":"Bethlehem Area School District","ror":"https://ror.org/05qxr6b81","country_code":"US","type":"education","lineage":["https://openalex.org/I4210165202"]}],"countries":["US"],"is_corresponding":true,"raw_author_name":"Paul E. Cohen","raw_affiliation_strings":["Bethlehem, Pennsylvania (U.S.A.)"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Bethlehem, Pennsylvania (U.S.A.)","institution_ids":["https://openalex.org/I4210165202"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":1,"corresponding_author_ids":["https://openalex.org/A5071569280"],"corresponding_institution_ids":["https://openalex.org/I4210165202"],"apc_list":{"value":2900,"currency":"USD","value_usd":2900},"apc_paid":null,"fwci":0.0,"has_fulltext":false,"cited_by_count":0,"citation_normalized_percentile":{"value":0.09680639,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":null,"biblio":{"volume":"24","issue":"19-24","first_page":"319","last_page":"321"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11727","display_name":"Advanced Algebra and Logic","score":0.9901999831199646,"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":0.9901999831199646,"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/T11010","display_name":"Logic, Reasoning, and Knowledge","score":0.9524000287055969,"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/ultraproduct","display_name":"Ultraproduct","score":0.8235376477241516},{"id":"https://openalex.org/keywords/citation","display_name":"Citation","score":0.57486891746521},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.4581529200077057},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.373218834400177},{"id":"https://openalex.org/keywords/information-retrieval","display_name":"Information retrieval","score":0.3249933123588562},{"id":"https://openalex.org/keywords/discrete-mathematics","display_name":"Discrete mathematics","score":0.302773654460907},{"id":"https://openalex.org/keywords/library-science","display_name":"Library science","score":0.24996185302734375}],"concepts":[{"id":"https://openalex.org/C167930466","wikidata":"https://www.wikidata.org/wiki/Q1535225","display_name":"Ultraproduct","level":2,"score":0.8235376477241516},{"id":"https://openalex.org/C2778805511","wikidata":"https://www.wikidata.org/wiki/Q1713","display_name":"Citation","level":2,"score":0.57486891746521},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.4581529200077057},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.373218834400177},{"id":"https://openalex.org/C23123220","wikidata":"https://www.wikidata.org/wiki/Q816826","display_name":"Information retrieval","level":1,"score":0.3249933123588562},{"id":"https://openalex.org/C118615104","wikidata":"https://www.wikidata.org/wiki/Q121416","display_name":"Discrete mathematics","level":1,"score":0.302773654460907},{"id":"https://openalex.org/C161191863","wikidata":"https://www.wikidata.org/wiki/Q199655","display_name":"Library science","level":1,"score":0.24996185302734375}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1002/malq.19780241906","is_oa":false,"landing_page_url":"https://doi.org/10.1002/malq.19780241906","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":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":0,"referenced_works":[],"related_works":["https://openalex.org/W127953164","https://openalex.org/W4255634141","https://openalex.org/W4241852443","https://openalex.org/W1987355600","https://openalex.org/W4231539572","https://openalex.org/W2897172575","https://openalex.org/W2125325344","https://openalex.org/W1986731234","https://openalex.org/W1817441072","https://openalex.org/W178479862"],"abstract_inverted_index":null,"counts_by_year":[],"updated_date":"2026-08-21T09:56:20.448147","created_date":"2025-10-10T00:00:00"}