🌐EnglishEnglishDeutschEspañolFrançaisItalianoPortuguêsSvenskaTiếng ViệtTürkçeРусскийالعربية中文日本語EntityQ1424764· pop 17· linked from 71 articlesKramers–Kronig relationsrelations connecting the real and imaginary parts of any complex function that is analytic in the upper half-planeAvailable in 17 languagesEspañolFrançaisDeutsch中文日本語РусскийPortuguêsItalianoالعربيةConnectionsforceEntitymathematicsEntityCategoriesComplex analysisElectric and magnetic fields in matter