{"id":"https://openalex.org/W2004136357","doi":"https://doi.org/10.1007/s10485-013-9354-3","title":"Composites of Central Extensions Form a Relative Semi-Abelian Category","display_name":"Composites of Central Extensions Form a Relative Semi-Abelian Category","publication_year":2013,"publication_date":"2013-12-03","ids":{"openalex":"https://openalex.org/W2004136357","doi":"https://doi.org/10.1007/s10485-013-9354-3","mag":"2004136357"},"language":"en","primary_location":{"id":"doi:10.1007/s10485-013-9354-3","is_oa":false,"landing_page_url":"https://doi.org/10.1007/s10485-013-9354-3","pdf_url":null,"source":{"id":"https://openalex.org/S148906134","display_name":"Applied Categorical Structures","issn_l":"0927-2852","issn":["0927-2852","1572-9095"],"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":"Applied Categorical Structures","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/A5041674101","display_name":"Tamar Janelidze-Gray","orcid":null},"institutions":[{"id":"https://openalex.org/I165390105","display_name":"University of South Africa","ror":"https://ror.org/048cwvf49","country_code":"ZA","type":"education","lineage":["https://openalex.org/I165390105"]},{"id":"https://openalex.org/I139025015","display_name":"Pioneer (United States)","ror":"https://ror.org/05jke7315","country_code":"US","type":"company","lineage":["https://openalex.org/I139025015","https://openalex.org/I4210104019"]}],"countries":["US","ZA"],"is_corresponding":true,"raw_author_name":"Tamar Janelidze-Gray","raw_affiliation_strings":["Department of Mathematical Sciences, College of Science, Engineering and Technology, University of South Africa, Cnr Christiaan de Wet & Pioneer Avenue, Florida, PO Box 392, 0003, Pretoria, South Africa","University of South Africa"],"affiliations":[{"raw_affiliation_string":"Department of Mathematical Sciences, College of Science, Engineering and Technology, University of South Africa, Cnr Christiaan de Wet & Pioneer Avenue, Florida, PO Box 392, 0003, Pretoria, South Africa","institution_ids":["https://openalex.org/I165390105","https://openalex.org/I139025015"]},{"raw_affiliation_string":"University of South Africa","institution_ids":["https://openalex.org/I165390105"]}]}],"institutions":[],"countries_distinct_count":2,"institutions_distinct_count":1,"corresponding_author_ids":["https://openalex.org/A5041674101"],"corresponding_institution_ids":["https://openalex.org/I139025015","https://openalex.org/I165390105"],"apc_list":{"value":2390,"currency":"EUR","value_usd":2990},"apc_paid":null,"fwci":1.1189,"has_fulltext":false,"cited_by_count":3,"citation_normalized_percentile":{"value":0.78436881,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":96},"biblio":{"volume":"22","issue":"5-6","first_page":"857","last_page":"872"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11727","display_name":"Advanced Algebra and Logic","score":0.9997000098228455,"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":0.9997000098228455,"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":0.9994000196456909,"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":0.9977999925613403,"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/subcategory","display_name":"Subcategory","score":0.8534153699874878},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.7814218997955322},{"id":"https://openalex.org/keywords/abelian-category","display_name":"Abelian category","score":0.7110666036605835},{"id":"https://openalex.org/keywords/coproduct","display_name":"Coproduct","score":0.6100301742553711},{"id":"https://openalex.org/keywords/abelian-group","display_name":"Abelian group","score":0.5830459594726562},{"id":"https://openalex.org/keywords/class","display_name":"Class (philosophy)","score":0.5378332138061523},{"id":"https://openalex.org/keywords/adjunction","display_name":"Adjunction","score":0.5250016450881958},{"id":"https://openalex.org/keywords/pure-mathematics","display_name":"Pure mathematics","score":0.5111129879951477},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.07962381839752197}],"concepts":[{"id":"https://openalex.org/C2780617661","wikidata":"https://www.wikidata.org/wiki/Q541563","display_name":"Subcategory","level":2,"score":0.8534153699874878},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.7814218997955322},{"id":"https://openalex.org/C186921422","wikidata":"https://www.wikidata.org/wiki/Q318737","display_name":"Abelian category","level":3,"score":0.7110666036605835},{"id":"https://openalex.org/C36259021","wikidata":"https://www.wikidata.org/wiki/Q692689","display_name":"Coproduct","level":2,"score":0.6100301742553711},{"id":"https://openalex.org/C136170076","wikidata":"https://www.wikidata.org/wiki/Q181296","display_name":"Abelian group","level":2,"score":0.5830459594726562},{"id":"https://openalex.org/C2777212361","wikidata":"https://www.wikidata.org/wiki/Q5127848","display_name":"Class (philosophy)","level":2,"score":0.5378332138061523},{"id":"https://openalex.org/C2780580338","wikidata":"https://www.wikidata.org/wiki/Q577835","display_name":"Adjunction","level":2,"score":0.5250016450881958},{"id":"https://openalex.org/C202444582","wikidata":"https://www.wikidata.org/wiki/Q837863","display_name":"Pure mathematics","level":1,"score":0.5111129879951477},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.07962381839752197},{"id":"https://openalex.org/C154945302","wikidata":"https://www.wikidata.org/wiki/Q11660","display_name":"Artificial intelligence","level":1,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1007/s10485-013-9354-3","is_oa":false,"landing_page_url":"https://doi.org/10.1007/s10485-013-9354-3","pdf_url":null,"source":{"id":"https://openalex.org/S148906134","display_name":"Applied Categorical Structures","issn_l":"0927-2852","issn":["0927-2852","1572-9095"],"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":"Applied Categorical Structures","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[{"score":0.49000000953674316,"id":"https://metadata.un.org/sdg/10","display_name":"Reduced inequalities"}],"awards":[],"funders":[],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":16,"referenced_works":["https://openalex.org/W108901460","https://openalex.org/W638225813","https://openalex.org/W1132327924","https://openalex.org/W1972512561","https://openalex.org/W1979086029","https://openalex.org/W1998444599","https://openalex.org/W2013805349","https://openalex.org/W2042312812","https://openalex.org/W2045103261","https://openalex.org/W2050717037","https://openalex.org/W2052476309","https://openalex.org/W2077770830","https://openalex.org/W2078588079","https://openalex.org/W2095401538","https://openalex.org/W2140019003","https://openalex.org/W2963875526"],"related_works":["https://openalex.org/W2340639273","https://openalex.org/W2912832437","https://openalex.org/W2063428732","https://openalex.org/W4288580318","https://openalex.org/W2044469772","https://openalex.org/W2996316720","https://openalex.org/W3190794470","https://openalex.org/W4281254010","https://openalex.org/W2509789139","https://openalex.org/W3189271531"],"abstract_inverted_index":null,"counts_by_year":[{"year":2016,"cited_by_count":2},{"year":2013,"cited_by_count":1}],"updated_date":"2025-11-06T03:46:38.306776","created_date":"2025-10-10T00:00:00"}