{"id":"https://openalex.org/W2045454195","doi":"https://doi.org/10.1016/s1571-0653(04)00040-x","title":"A Theory of Diversity","display_name":"A Theory of Diversity","publication_year":1999,"publication_date":"1999-04-01","ids":{"openalex":"https://openalex.org/W2045454195","doi":"https://doi.org/10.1016/s1571-0653(04)00040-x","mag":"2045454195"},"language":"en","primary_location":{"id":"doi:10.1016/s1571-0653(04)00040-x","is_oa":false,"landing_page_url":"https://doi.org/10.1016/s1571-0653(04)00040-x","pdf_url":null,"source":{"id":"https://openalex.org/S902237881","display_name":"Electronic Notes in Discrete Mathematics","issn_l":"1571-0653","issn":["1571-0653"],"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":"Electronic Notes in Discrete Mathematics","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/A5023819745","display_name":"Klaus Nehring","orcid":null},"institutions":[{"id":"https://openalex.org/I84218800","display_name":"University of California, Davis","ror":"https://ror.org/05rrcem69","country_code":"US","type":"education","lineage":["https://openalex.org/I84218800"]}],"countries":["US"],"is_corresponding":true,"raw_author_name":"Klaus Nehring","raw_affiliation_strings":["Department of Economics, University of California at Davis, USA, web: http://www.econ.ucdavis.edu/~nehring"],"affiliations":[{"raw_affiliation_string":"Department of Economics, University of California at Davis, USA, web: http://www.econ.ucdavis.edu/~nehring","institution_ids":["https://openalex.org/I84218800"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5080754318","display_name":"Clemens Puppe","orcid":"https://orcid.org/0000-0002-2110-1017"},"institutions":[{"id":"https://openalex.org/I135140700","display_name":"University of Bonn","ror":"https://ror.org/041nas322","country_code":"DE","type":"education","lineage":["https://openalex.org/I135140700"]}],"countries":["DE"],"is_corresponding":true,"raw_author_name":"Clemens Puppe","raw_affiliation_strings":["Department of Economics, University of Bonn Adenauerallee 24-42. D-53113 Bonn, Germany","Department of Economics University of Bonn Adenauerallee 24\u201042, D\u201053113 Bonn, Germany"],"affiliations":[{"raw_affiliation_string":"Department of Economics, University of Bonn Adenauerallee 24-42. D-53113 Bonn, Germany","institution_ids":["https://openalex.org/I135140700"]},{"raw_affiliation_string":"Department of Economics University of Bonn Adenauerallee 24\u201042, D\u201053113 Bonn, Germany","institution_ids":["https://openalex.org/I135140700"]}]}],"institutions":[],"countries_distinct_count":2,"institutions_distinct_count":2,"corresponding_author_ids":["https://openalex.org/A5023819745","https://openalex.org/A5080754318"],"corresponding_institution_ids":["https://openalex.org/I135140700","https://openalex.org/I84218800"],"apc_list":null,"apc_paid":null,"fwci":1.1233,"has_fulltext":false,"cited_by_count":9,"citation_normalized_percentile":{"value":0.78912758,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":95},"biblio":{"volume":"2","issue":null,"first_page":"180","last_page":"181"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T13297","display_name":"History and advancements in chemistry","score":0.9559999704360962,"subfield":{"id":"https://openalex.org/subfields/1606","display_name":"Physical and Theoretical Chemistry"},"field":{"id":"https://openalex.org/fields/16","display_name":"Chemistry"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T13297","display_name":"History and advancements in chemistry","score":0.9559999704360962,"subfield":{"id":"https://openalex.org/subfields/1606","display_name":"Physical and Theoretical Chemistry"},"field":{"id":"https://openalex.org/fields/16","display_name":"Chemistry"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T12527","display_name":"Chemistry and Stereochemistry Studies","score":0.9541000127792358,"subfield":{"id":"https://openalex.org/subfields/1605","display_name":"Organic Chemistry"},"field":{"id":"https://openalex.org/fields/16","display_name":"Chemistry"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.6699865460395813},{"id":"https://openalex.org/keywords/set-function","display_name":"Set function","score":0.6590962409973145},{"id":"https://openalex.org/keywords/power-set","display_name":"Power set","score":0.6372398138046265},{"id":"https://openalex.org/keywords/representation","display_name":"Representation (politics)","score":0.5042508840560913},{"id":"https://openalex.org/keywords/monotone-polygon","display_name":"Monotone polygon","score":0.5001356601715088},{"id":"https://openalex.org/keywords/function","display_name":"Function (biology)","score":0.4946920573711395},{"id":"https://openalex.org/keywords/set","display_name":"Set (abstract data type)","score":0.48357030749320984},{"id":"https://openalex.org/keywords/similarity","display_name":"Similarity (geometry)","score":0.43224501609802246},{"id":"https://openalex.org/keywords/discrete-mathematics","display_name":"Discrete mathematics","score":0.4235730767250061},{"id":"https://openalex.org/keywords/combinatorics","display_name":"Combinatorics","score":0.3863758444786072},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.2555517554283142},{"id":"https://openalex.org/keywords/artificial-intelligence","display_name":"Artificial intelligence","score":0.1651509404182434},{"id":"https://openalex.org/keywords/image","display_name":"Image (mathematics)","score":0.0867573618888855}],"concepts":[{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.6699865460395813},{"id":"https://openalex.org/C15312841","wikidata":"https://www.wikidata.org/wiki/Q1657198","display_name":"Set function","level":3,"score":0.6590962409973145},{"id":"https://openalex.org/C100643331","wikidata":"https://www.wikidata.org/wiki/Q205170","display_name":"Power set","level":3,"score":0.6372398138046265},{"id":"https://openalex.org/C2776359362","wikidata":"https://www.wikidata.org/wiki/Q2145286","display_name":"Representation (politics)","level":3,"score":0.5042508840560913},{"id":"https://openalex.org/C2834757","wikidata":"https://www.wikidata.org/wiki/Q4925424","display_name":"Monotone polygon","level":2,"score":0.5001356601715088},{"id":"https://openalex.org/C14036430","wikidata":"https://www.wikidata.org/wiki/Q3736076","display_name":"Function (biology)","level":2,"score":0.4946920573711395},{"id":"https://openalex.org/C177264268","wikidata":"https://www.wikidata.org/wiki/Q1514741","display_name":"Set (abstract data type)","level":2,"score":0.48357030749320984},{"id":"https://openalex.org/C103278499","wikidata":"https://www.wikidata.org/wiki/Q254465","display_name":"Similarity (geometry)","level":3,"score":0.43224501609802246},{"id":"https://openalex.org/C118615104","wikidata":"https://www.wikidata.org/wiki/Q121416","display_name":"Discrete mathematics","level":1,"score":0.4235730767250061},{"id":"https://openalex.org/C114614502","wikidata":"https://www.wikidata.org/wiki/Q76592","display_name":"Combinatorics","level":1,"score":0.3863758444786072},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.2555517554283142},{"id":"https://openalex.org/C154945302","wikidata":"https://www.wikidata.org/wiki/Q11660","display_name":"Artificial intelligence","level":1,"score":0.1651509404182434},{"id":"https://openalex.org/C115961682","wikidata":"https://www.wikidata.org/wiki/Q860623","display_name":"Image (mathematics)","level":2,"score":0.0867573618888855},{"id":"https://openalex.org/C78458016","wikidata":"https://www.wikidata.org/wiki/Q840400","display_name":"Evolutionary biology","level":1,"score":0.0},{"id":"https://openalex.org/C199539241","wikidata":"https://www.wikidata.org/wiki/Q7748","display_name":"Law","level":1,"score":0.0},{"id":"https://openalex.org/C2524010","wikidata":"https://www.wikidata.org/wiki/Q8087","display_name":"Geometry","level":1,"score":0.0},{"id":"https://openalex.org/C17744445","wikidata":"https://www.wikidata.org/wiki/Q36442","display_name":"Political science","level":0,"score":0.0},{"id":"https://openalex.org/C199360897","wikidata":"https://www.wikidata.org/wiki/Q9143","display_name":"Programming language","level":1,"score":0.0},{"id":"https://openalex.org/C86803240","wikidata":"https://www.wikidata.org/wiki/Q420","display_name":"Biology","level":0,"score":0.0},{"id":"https://openalex.org/C94625758","wikidata":"https://www.wikidata.org/wiki/Q7163","display_name":"Politics","level":2,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1016/s1571-0653(04)00040-x","is_oa":false,"landing_page_url":"https://doi.org/10.1016/s1571-0653(04)00040-x","pdf_url":null,"source":{"id":"https://openalex.org/S902237881","display_name":"Electronic Notes in Discrete Mathematics","issn_l":"1571-0653","issn":["1571-0653"],"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":"Electronic Notes in Discrete Mathematics","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":20,"referenced_works":["https://openalex.org/W1542085384","https://openalex.org/W1562353621","https://openalex.org/W1577252879","https://openalex.org/W1769594238","https://openalex.org/W1973436181","https://openalex.org/W1982354915","https://openalex.org/W1983618218","https://openalex.org/W1998871699","https://openalex.org/W2033764940","https://openalex.org/W2048941615","https://openalex.org/W2050036885","https://openalex.org/W2051460359","https://openalex.org/W2061588115","https://openalex.org/W2062201521","https://openalex.org/W2097614924","https://openalex.org/W2117079761","https://openalex.org/W2158382529","https://openalex.org/W2262420275","https://openalex.org/W3125621216","https://openalex.org/W3126105906"],"related_works":["https://openalex.org/W3194235253","https://openalex.org/W2395936695","https://openalex.org/W2923536170","https://openalex.org/W2039939787","https://openalex.org/W1966806056","https://openalex.org/W1990427911","https://openalex.org/W1998631001","https://openalex.org/W2009346604","https://openalex.org/W2526851682","https://openalex.org/W1971756873"],"abstract_inverted_index":null,"counts_by_year":[{"year":2025,"cited_by_count":1},{"year":2023,"cited_by_count":1},{"year":2021,"cited_by_count":1}],"updated_date":"2025-11-06T03:46:38.306776","created_date":"2025-10-10T00:00:00"}