{"id":"https://openalex.org/keywords/model-categories","display_name":"model categories","description":"A structure in category theory equipped with classes of weak equivalences, fibrations, and cofibrations for studying homotopy theory.","display_name_alternatives":["closed model categories","closed model category","model category","Quillen model category"],"ids":{"openalex":"https://openalex.org/keywords/model-categories","wikidata":"https://www.wikidata.org/wiki/Q1941896"},"primary_topic":{"id":"https://openalex.org/T10896","display_name":"Homotopy and Cohomology in Algebraic Topology","score":0.8473,"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"}},"topics":[{"id":"https://openalex.org/T10896","display_name":"Homotopy and Cohomology in Algebraic Topology","score":0.8473,"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"}}],"works_count":1095,"cited_by_count":13496,"works_api_url":"https://api.openalex.org/works?filter=keywords.id:keywords/model-categories","updated_date":"2026-10-17T04:06:27","created_date":"2026-09-30T00:00:00"}
