{"aliases":[],"awards":[],"biography_summary":"Karl Wilhelm Feuerbach (30 May 1800 \u2013 12 March 1834) was a German geometer and the son of legal scholar Paul Johann Anselm Ritter von Feuerbach, and the brother of philosopher Ludwig Feuerbach. After receiving his doctorate at age 22, he became a professor of mathematics at the Gymnasium at Erlangen. In 1822 he wrote a small book on mathematics noted mainly for a theorem on the nine-point circle, which is now known as Feuerbach's theorem. In 1827 he introduced homogeneous coordinates, independently of M\u00f6bius.","birth_date":"1800-05-30","birth_place":"Jena","birth_place_coordinates":{"latitude":50.927222,"longitude":11.586389},"birth_place_wikidata_id":"Q3150","birth_place_wikidata_url":"https://www.wikidata.org/wiki/Q3150","canonical_name":"Karl Wilhelm Feuerbach","canonical_url":"https://zh-cn.instaget.online/people/85e874b9d74f46bd60e339b5","citizenships":["Saxe-Weimar-Eisenach"],"death_date":"1834-03-12","description":"German mathematician (1800\u20131834)","external_ids":{"isni":{"id":"0000000010489752","url":"https://isni.org/isni/0000000010489752"},"viaf":{"id":"67218126","url":"https://viaf.org/viaf/67218126/"}},"full_name":"Karl Wilhelm Feuerbach","height_cm":null,"names":{"aliases":["Karl Wilhelm von Feuerbach"],"birth":[],"native":[{"language":"de","source_property":"P1559","value":"Karl Wilhelm Feuerbach"}],"official":[]},"native_name":null,"notable_works":["Feuerbach hyperbola","Feuerbach's theorem","Grundriss zu analytischen Untersuchungen der dreieckigen Pyramide"],"occupations":["mathematician","university teacher"],"official_websites":[],"photo":{"author":"http://xavier.hubaut.info/coursmath/bio/feuerbac.htm","license":"Public domain","license_url":null,"source":"Wikimedia Commons","source_url":"https://commons.wikimedia.org/wiki/File:Karl_Wilhelm_Feuerbach.jpg","url":"https://instaget-public-commons.tor1.cdn.digitaloceanspaces.com/public/commons/5e2b10cb5d16bca764e97cca17cc04508ef918ecd5866a63609932b3a72cb2b4"},"profile_url":"https://zh-cn.instaget.online/people/85e874b9d74f46bd60e339b5","provenance":{"catalog":"wikidata_wikipedia","fetched_at":"2026-08-29T07:37:34Z","social_archives_included":false,"source_url":"https://www.wikidata.org/wiki/Q70884"},"public_hash":"85e874b9d74f46bd60e339b5","schema_version":"1.1","socials":{},"tags":[{"key":"category:science-and-academia","label":"Science and academia","type":"category"},{"key":"occupation:mathematician","label":"mathematician","type":"occupation"},{"key":"occupation:university teacher","label":"university teacher","type":"occupation"},{"key":"country:jena","label":"Jena","type":"country"},{"key":"citizenship:saxe-weimar-eisenach","label":"Saxe-Weimar-Eisenach","type":"citizenship"}],"wikidata_id":"Q70884","wikidata_url":"https://www.wikidata.org/wiki/Q70884","wikipedia_url":"https://en.wikipedia.org/wiki/Karl_Wilhelm_Feuerbach"}