{"id":"https://openalex.org/W2022587730","doi":"https://doi.org/10.1007/bf02573981","title":"Two constructions of oriented matroids with disconnected extension space","display_name":"Two constructions of oriented matroids with disconnected extension space","publication_year":1993,"publication_date":"1993-09-01","ids":{"openalex":"https://openalex.org/W2022587730","doi":"https://doi.org/10.1007/bf02573981","mag":"2022587730"},"language":"en","primary_location":{"id":"doi:10.1007/bf02573981","is_oa":true,"landing_page_url":"https://doi.org/10.1007/bf02573981","pdf_url":"https://link.springer.com/content/pdf/10.1007/BF02573981.pdf","source":{"id":"https://openalex.org/S103671469","display_name":"Discrete & Computational Geometry","issn_l":"0179-5376","issn":["0179-5376","1432-0444"],"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":"Discrete &amp; Computational Geometry","raw_type":"journal-article"},"type":"article","indexed_in":["crossref"],"open_access":{"is_oa":true,"oa_status":"bronze","oa_url":"https://link.springer.com/content/pdf/10.1007/BF02573981.pdf","any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":null,"display_name":"Nicolai E. Mn\u00ebv","orcid":null},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"Nicolai E. Mn\u00ebv","raw_affiliation_strings":["Ul. Korablestroiteley 40-1-187, 199 155, St. Petersburg, Russia",", St. Petersburg, Russia 199 155#TAB#"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Ul. Korablestroiteley 40-1-187, 199 155, St. Petersburg, Russia","institution_ids":[]},{"raw_affiliation_string":", St. Petersburg, Russia 199 155#TAB#","institution_ids":[]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5070071334","display_name":"J\u00fcrgen Richter-Gebert","orcid":null},"institutions":[{"id":"https://openalex.org/I106618798","display_name":"Beiersdorf (Germany)","ror":"https://ror.org/04aqg9s78","country_code":"DE","type":"company","lineage":["https://openalex.org/I106618798"]}],"countries":["DE"],"is_corresponding":false,"raw_author_name":"J\u00fcrgen Richter-Gebert","raw_affiliation_strings":["Auf dem Wingert 3, D-64380, Ro\u00dfdorf, Federal Republic of Germany",", Ro\u03b2dorf, Federal Republic of Germany D-64380#TAB#"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Auf dem Wingert 3, D-64380, Ro\u00dfdorf, Federal Republic of Germany","institution_ids":[]},{"raw_affiliation_string":", Ro\u03b2dorf, Federal Republic of Germany D-64380#TAB#","institution_ids":["https://openalex.org/I106618798"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":2,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":{"value":2290,"currency":"EUR","value_usd":2890},"apc_paid":null,"fwci":0.4199,"has_fulltext":true,"cited_by_count":14,"citation_normalized_percentile":{"value":0.57446454,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":96},"biblio":{"volume":"10","issue":"3","first_page":"271","last_page":"285"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11072","display_name":"Peroxisome Proliferator-Activated Receptors","score":0.972599983215332,"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"}},"topics":[{"id":"https://openalex.org/T11072","display_name":"Peroxisome Proliferator-Activated Receptors","score":0.972599983215332,"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"}},{"id":"https://openalex.org/T11618","display_name":"Cholesterol and Lipid Metabolism","score":0.9193999767303467,"subfield":{"id":"https://openalex.org/subfields/2746","display_name":"Surgery"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/matroid","display_name":"Matroid","score":0.9605199098587036},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.8223427534103394},{"id":"https://openalex.org/keywords/extension","display_name":"Extension (predicate logic)","score":0.7663904428482056},{"id":"https://openalex.org/keywords/combinatorics","display_name":"Combinatorics","score":0.7112969756126404},{"id":"https://openalex.org/keywords/rank","display_name":"Rank (graph theory)","score":0.6303094625473022},{"id":"https://openalex.org/keywords/homotopy","display_name":"Homotopy","score":0.6221768856048584},{"id":"https://openalex.org/keywords/graphic-matroid","display_name":"Graphic matroid","score":0.5705381631851196},{"id":"https://openalex.org/keywords/space","display_name":"Space (punctuation)","score":0.4713420569896698},{"id":"https://openalex.org/keywords/partially-ordered-set","display_name":"Partially ordered set","score":0.4499555230140686},{"id":"https://openalex.org/keywords/oriented-matroid","display_name":"Oriented matroid","score":0.4244036078453064},{"id":"https://openalex.org/keywords/discrete-mathematics","display_name":"Discrete mathematics","score":0.3450714349746704},{"id":"https://openalex.org/keywords/pure-mathematics","display_name":"Pure mathematics","score":0.24103811383247375},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.07965001463890076}],"concepts":[{"id":"https://openalex.org/C106286213","wikidata":"https://www.wikidata.org/wiki/Q898572","display_name":"Matroid","level":2,"score":0.9605199098587036},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.8223427534103394},{"id":"https://openalex.org/C2778029271","wikidata":"https://www.wikidata.org/wiki/Q5421931","display_name":"Extension (predicate logic)","level":2,"score":0.7663904428482056},{"id":"https://openalex.org/C114614502","wikidata":"https://www.wikidata.org/wiki/Q76592","display_name":"Combinatorics","level":1,"score":0.7112969756126404},{"id":"https://openalex.org/C164226766","wikidata":"https://www.wikidata.org/wiki/Q7293202","display_name":"Rank (graph theory)","level":2,"score":0.6303094625473022},{"id":"https://openalex.org/C5961521","wikidata":"https://www.wikidata.org/wiki/Q746083","display_name":"Homotopy","level":2,"score":0.6221768856048584},{"id":"https://openalex.org/C111034964","wikidata":"https://www.wikidata.org/wiki/Q5597156","display_name":"Graphic matroid","level":3,"score":0.5705381631851196},{"id":"https://openalex.org/C2778572836","wikidata":"https://www.wikidata.org/wiki/Q380933","display_name":"Space (punctuation)","level":2,"score":0.4713420569896698},{"id":"https://openalex.org/C180645754","wikidata":"https://www.wikidata.org/wiki/Q474715","display_name":"Partially ordered set","level":2,"score":0.4499555230140686},{"id":"https://openalex.org/C178621168","wikidata":"https://www.wikidata.org/wiki/Q16155113","display_name":"Oriented matroid","level":4,"score":0.4244036078453064},{"id":"https://openalex.org/C118615104","wikidata":"https://www.wikidata.org/wiki/Q121416","display_name":"Discrete mathematics","level":1,"score":0.3450714349746704},{"id":"https://openalex.org/C202444582","wikidata":"https://www.wikidata.org/wiki/Q837863","display_name":"Pure mathematics","level":1,"score":0.24103811383247375},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.07965001463890076},{"id":"https://openalex.org/C111919701","wikidata":"https://www.wikidata.org/wiki/Q9135","display_name":"Operating system","level":1,"score":0.0},{"id":"https://openalex.org/C199360897","wikidata":"https://www.wikidata.org/wiki/Q9143","display_name":"Programming language","level":1,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1007/bf02573981","is_oa":true,"landing_page_url":"https://doi.org/10.1007/bf02573981","pdf_url":"https://link.springer.com/content/pdf/10.1007/BF02573981.pdf","source":{"id":"https://openalex.org/S103671469","display_name":"Discrete & Computational Geometry","issn_l":"0179-5376","issn":["0179-5376","1432-0444"],"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":"Discrete &amp; Computational Geometry","raw_type":"journal-article"}],"best_oa_location":{"id":"doi:10.1007/bf02573981","is_oa":true,"landing_page_url":"https://doi.org/10.1007/bf02573981","pdf_url":"https://link.springer.com/content/pdf/10.1007/BF02573981.pdf","source":{"id":"https://openalex.org/S103671469","display_name":"Discrete & Computational Geometry","issn_l":"0179-5376","issn":["0179-5376","1432-0444"],"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":"Discrete &amp; Computational Geometry","raw_type":"journal-article"},"sustainable_development_goals":[],"awards":[],"funders":[],"has_content":{"pdf":true,"grobid_xml":true},"content_urls":{"pdf":"https://content.openalex.org/works/W2022587730.pdf","grobid_xml":"https://content.openalex.org/works/W2022587730.grobid-xml"},"referenced_works_count":11,"referenced_works":["https://openalex.org/W1986181473","https://openalex.org/W1988235646","https://openalex.org/W2051998168","https://openalex.org/W2088377437","https://openalex.org/W2160283861","https://openalex.org/W2169964297","https://openalex.org/W2196559987","https://openalex.org/W2330548796","https://openalex.org/W2971330320","https://openalex.org/W4210626175","https://openalex.org/W4212938248"],"related_works":["https://openalex.org/W2400862597","https://openalex.org/W2072414647","https://openalex.org/W2368666440","https://openalex.org/W2058489697","https://openalex.org/W2379298228","https://openalex.org/W2365825493","https://openalex.org/W2550106438","https://openalex.org/W1019084690","https://openalex.org/W1984819493","https://openalex.org/W2153065381"],"abstract_inverted_index":null,"counts_by_year":[{"year":2022,"cited_by_count":1},{"year":2021,"cited_by_count":1},{"year":2019,"cited_by_count":2}],"updated_date":"2026-06-19T17:40:00.097472","created_date":"2025-10-10T00:00:00"}
