{"id":"https://openalex.org/W1999487930","doi":"https://doi.org/10.1016/s0195-6698(87)80048-3","title":"On the Null-Homotopy of Bridged Graphs","display_name":"On the Null-Homotopy of Bridged Graphs","publication_year":1987,"publication_date":"1987-10-01","ids":{"openalex":"https://openalex.org/W1999487930","doi":"https://doi.org/10.1016/s0195-6698(87)80048-3","mag":"1999487930"},"language":"en","primary_location":{"id":"doi:10.1016/s0195-6698(87)80048-3","is_oa":false,"landing_page_url":"https://doi.org/10.1016/s0195-6698(87)80048-3","pdf_url":null,"source":{"id":"https://openalex.org/S204851967","display_name":"European Journal of Combinatorics","issn_l":"0195-6698","issn":["0195-6698","1095-9971"],"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":"European Journal of Combinatorics","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/A5008224159","display_name":"Robert E. Jamison","orcid":"https://orcid.org/0000-0001-6116-7662"},"institutions":[{"id":"https://openalex.org/I161046081","display_name":"University of Freiburg","ror":"https://ror.org/0245cg223","country_code":"DE","type":"education","lineage":["https://openalex.org/I161046081"]}],"countries":["DE"],"is_corresponding":true,"raw_author_name":"Robert E. Jamison","raw_affiliation_strings":["Mathematisches Institut, Universit\u00e4t Freiburg, Freiburg, F.R.G","University of Freiburg, Freiburg, FRG#TAB#"],"affiliations":[{"raw_affiliation_string":"Mathematisches Institut, Universit\u00e4t Freiburg, Freiburg, F.R.G","institution_ids":["https://openalex.org/I161046081"]},{"raw_affiliation_string":"University of Freiburg, Freiburg, FRG#TAB#","institution_ids":["https://openalex.org/I161046081"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":1,"corresponding_author_ids":["https://openalex.org/A5008224159"],"corresponding_institution_ids":["https://openalex.org/I161046081"],"apc_list":{"value":2880,"currency":"USD","value_usd":2880},"apc_paid":null,"fwci":1.8281,"has_fulltext":false,"cited_by_count":13,"citation_normalized_percentile":{"value":0.85606936,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":93},"biblio":{"volume":"8","issue":"4","first_page":"421","last_page":"428"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11151","display_name":"Advanced Topology and Set Theory","score":0.991599977016449,"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"}},"topics":[{"id":"https://openalex.org/T11151","display_name":"Advanced Topology and Set Theory","score":0.991599977016449,"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"}},{"id":"https://openalex.org/T12536","display_name":"Topological and Geometric Data Analysis","score":0.9865000247955322,"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/T10896","display_name":"Homotopy and Cohomology in Algebraic Topology","score":0.979200005531311,"subfield":{"id":"https://openalex.org/subfields/2610","display_name":"Mathematical Physics"},"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/mathematics","display_name":"Mathematics","score":0.8795166611671448},{"id":"https://openalex.org/keywords/chordal-graph","display_name":"Chordal graph","score":0.8230142593383789},{"id":"https://openalex.org/keywords/combinatorics","display_name":"Combinatorics","score":0.7142089009284973},{"id":"https://openalex.org/keywords/homotopy","display_name":"Homotopy","score":0.604669988155365},{"id":"https://openalex.org/keywords/null","display_name":"Null (SQL)","score":0.5820010900497437},{"id":"https://openalex.org/keywords/graph","display_name":"Graph","score":0.47210755944252014},{"id":"https://openalex.org/keywords/indifference-graph","display_name":"Indifference graph","score":0.42720815539360046},{"id":"https://openalex.org/keywords/class","display_name":"Class (philosophy)","score":0.4147513806819916},{"id":"https://openalex.org/keywords/discrete-mathematics","display_name":"Discrete mathematics","score":0.3840540647506714},{"id":"https://openalex.org/keywords/pure-mathematics","display_name":"Pure mathematics","score":0.17295032739639282},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.06635913252830505}],"concepts":[{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.8795166611671448},{"id":"https://openalex.org/C160446614","wikidata":"https://www.wikidata.org/wiki/Q1322892","display_name":"Chordal graph","level":3,"score":0.8230142593383789},{"id":"https://openalex.org/C114614502","wikidata":"https://www.wikidata.org/wiki/Q76592","display_name":"Combinatorics","level":1,"score":0.7142089009284973},{"id":"https://openalex.org/C5961521","wikidata":"https://www.wikidata.org/wiki/Q746083","display_name":"Homotopy","level":2,"score":0.604669988155365},{"id":"https://openalex.org/C203763787","wikidata":"https://www.wikidata.org/wiki/Q371029","display_name":"Null (SQL)","level":2,"score":0.5820010900497437},{"id":"https://openalex.org/C132525143","wikidata":"https://www.wikidata.org/wiki/Q141488","display_name":"Graph","level":2,"score":0.47210755944252014},{"id":"https://openalex.org/C74133993","wikidata":"https://www.wikidata.org/wiki/Q3115472","display_name":"Indifference graph","level":3,"score":0.42720815539360046},{"id":"https://openalex.org/C2777212361","wikidata":"https://www.wikidata.org/wiki/Q5127848","display_name":"Class (philosophy)","level":2,"score":0.4147513806819916},{"id":"https://openalex.org/C118615104","wikidata":"https://www.wikidata.org/wiki/Q121416","display_name":"Discrete mathematics","level":1,"score":0.3840540647506714},{"id":"https://openalex.org/C202444582","wikidata":"https://www.wikidata.org/wiki/Q837863","display_name":"Pure mathematics","level":1,"score":0.17295032739639282},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.06635913252830505},{"id":"https://openalex.org/C77088390","wikidata":"https://www.wikidata.org/wiki/Q8513","display_name":"Database","level":1,"score":0.0},{"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:10.1016/s0195-6698(87)80048-3","is_oa":false,"landing_page_url":"https://doi.org/10.1016/s0195-6698(87)80048-3","pdf_url":null,"source":{"id":"https://openalex.org/S204851967","display_name":"European Journal of Combinatorics","issn_l":"0195-6698","issn":["0195-6698","1095-9971"],"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":"European Journal of Combinatorics","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/W1984528974","https://openalex.org/W2035331304","https://openalex.org/W2040168968","https://openalex.org/W2041910029","https://openalex.org/W2081462933","https://openalex.org/W4299866835"],"related_works":["https://openalex.org/W4287117052","https://openalex.org/W2157783000","https://openalex.org/W3176308333","https://openalex.org/W4206705200","https://openalex.org/W2966902162","https://openalex.org/W2028363955","https://openalex.org/W1893557706","https://openalex.org/W4214565117","https://openalex.org/W2407722793","https://openalex.org/W1527735759"],"abstract_inverted_index":null,"counts_by_year":[{"year":2021,"cited_by_count":1}],"updated_date":"2026-03-10T14:07:55.174380","created_date":"2025-10-10T00:00:00"}
