Fourvertex theorem (Q994401)
From Wikidata
theorem that every simple closed smooth curve in the plane has at least four points of locally extreme curvature
Language  Label  Description  Also known as 

English 
Fourvertex theorem

theorem that every simple closed smooth curve in the plane has at least four points of locally extreme curvature

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Wikipedia(6 entries)
 dewiki Vierscheitelsatz
 enwiki Fourvertex theorem
 frwiki Théorème des quatre sommets
 ptwiki Teorema dos quatro vértices
 ruwiki Теорема о четырёх вершинах
 zhwiki 四頂點定理