Home›Browse›obstruction theory🌐EnglishEnglishDeutschEspañolFrançaisPortuguêsSvenskaالعربية中文日本語EntityQ1017338· pop 6· linked from 34 articlesobstruction theorySign in to saveMathematical theoriesWikidata factsInstance ofbranch of mathematicsShow 1 more factmaintained by WikiProjectWikiProject MathematicsSources (1)wikidata.orgvia Wikidata · CC0Available in 6 languagesEspañolFrançaisDeutsch中文العربيةvia Wikidata sitelinks · CC0