🌐فارسیEnglishBahasa IndonesiaDeutschEspañolFrançaisItalianoNederlandsPolskiPortuguêsSvenskaРусскийالعربيةفارسی한국어中文日本語EntityQ673253· pop 32· linked from 255 articlesقرارداد جمعزنی اینشتینAlso known as Einstein summation convention, summation conventionshorthand notation for tensor operationsAvailable in 31 languagesEspañolFrançaisDeutsch中文日本語РусскийPortuguêsItalianoالعربيةAzerbaijaniConnectionsdifferential formEntityfree and bound variablesEntityCategoriesAlbert EinsteinMathematical notationMathematical physicsMultilinear algebraRiemannian geometryTensors