🌐EnglishEnglishDeutschEspañolFrançaisNederlandsTürkçeРусскийالعربية한국어中文日本語EntityQ2454208· pop 8· linked from 70 articlessystoleminimum length of a noncontractible closed curve in a metric spaceConnectionsRiemannian manifoldEntityMikhail KatzEntityCategoriesSystolic geometry