🌐EnglishEnglishDeutschEspañolFrançaisItalianoNederlandsPolskiPortuguêsTiếng ViệtРусскийالعربيةفارسی한국어中文日本語EntityQ1198874· pop 17· linked from 331 articlesoperator theorymathematical study of linear operators on function spaces, such as differential operators and integral operatorsAvailable in 17 languagesEspañolDeutsch中文日本語РусскийPortuguêsItalianoالعربيةChuvashKazakhConnectionslinear mapEntityeigenvectors and eigenvaluesEntityCategoriesOperator theory