🌐EnglishEnglishEspañolFrançaisItalianoРусскийفارسی中文日本語EntityQ592286· pop 10· linked from 28 articlesbijective proofproof technique in combinatorics that finds a bijection between the things to be counted and some easily countable thingsWikidata factsImageJoyal2.pngSources (1)wikidata.orgvia Wikidata · CC0Available in 10 languagesEspañolFrançais中文РусскийItalianoAzerbaijaniBasqueUkrainianفارسیvia Wikidata sitelinks · CC0ConnectionsInternational Standard Book NumberEntitynumber theoryEntityCategoriesEnumerative combinatoricsMathematical proofs